From d5f0f967f1ed43fcb4b4da6716bfd7f6e4bc00b8 Mon Sep 17 00:00:00 2001 From: Colin Dean Date: Wed, 10 Oct 2012 13:09:23 -0400 Subject: [PATCH] import from http://ronja.twibright.com/optar/ --- COPYING | 353 ++++++++ Makefile | 48 + README | 113 +++ common.c | 69 ++ font.h | 2529 +++++++++++++++++++++++++++++++++++++++++++++++++++++ golay.c | 64 ++ golay.svg | 1298 +++++++++++++++++++++++++++ optar.c | 323 +++++++ optar.h | 77 ++ parity.c | 26 + parity.h | 7 + pgm2ps | 17 + unoptar.c | 1696 +++++++++++++++++++++++++++++++++++ 13 files changed, 6620 insertions(+) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README create mode 100644 common.c create mode 100644 font.h create mode 100644 golay.c create mode 100644 golay.svg create mode 100644 optar.c create mode 100644 optar.h create mode 100644 parity.c create mode 100644 parity.h create mode 100644 pgm2ps create mode 100644 unoptar.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..248ec20 --- /dev/null +++ b/COPYING @@ -0,0 +1,353 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. + + In addition, as a special exception, the copyright holders give + permission to link the code of portions of this program with the + OpenSSL library under certain conditions as described in each + individual source file, and distribute linked combinations + including the two. + You must obey the GNU General Public License in all respects + for all of the code used other than OpenSSL. If you modify + file(s) with this exception, you may extend this exception to your + version of the file(s), but you are not obligated to do so. If you + do not wish to do so, delete this exception statement from your + version. If you delete this exception statement from all source + files in the program, then also delete it here. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..5c62e52 --- /dev/null +++ b/Makefile @@ -0,0 +1,48 @@ +LDFLAGS=-lm +CFLAGS=-O3 -Wall -Wuninitialized -fomit-frame-pointer -funroll-loops \ + -fstrength-reduce -DNODEBUG `libpng-config --I_opts` + +all: optar unoptar + +install: + install optar /usr/local/bin/ + install unoptar /usr/local/bin + install pgm2ps /usr/local/bin + +uninstall: + rm /usr/local/bin/optar + rm /usr/local/bin/unoptar + rm /usr/local/bin/pgm2ps + +clean: + rm -f optar unoptar golay golay_codes.c *.o + +common.o: common.c optar.h + gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $< + +parity.o: parity.c + gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $< + +optar.o: optar.c optar.h font.h parity.h + gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $< + +golay_codes.o: golay_codes.c + gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $< + +golay.o: golay.c parity.h + gcc -c $(CPPFLAGS) $(CFLAGS) -o $@ $< + +unoptar.o: unoptar.c optar.h parity.h + gcc -c -I/usr/local/include/libpng $(CPPFLAGS) $(CFLAGS) -o $@ $< + +optar: optar.o common.o golay_codes.o parity.o + gcc $(LDFLAGS) -o $@ $^ + +golay_codes.c: golay + ./$< > $@ + +golay: golay.o parity.o + gcc $(LDFLAGS) -o $@ $^ + +unoptar: unoptar.o common.o golay_codes.o parity.o + gcc $(LDFLAGS) -o $@ -L/usr/local/lib -lpng -lz $^ diff --git a/README b/README new file mode 100644 index 0000000..a1ad5e3 --- /dev/null +++ b/README @@ -0,0 +1,113 @@ +Twibright Optar +--------------- + +This is a program to store data on paper using a 600dpi b/w laser printer and a +600+ dpi scanner. + +You need to install ImageMagick so that the resulting .pgm image can be converted into +PostScript with the right dimensions (so each pixel is 3x3 600dpi pixels so that +there is no unnecessary jitter). + +Make sure you have libpng installed and if you type "libpng-config" on the +commandline, there's a program which prints something. + +Compile with "make". Become root (su -) and type "make install". Now you have +optar, unoptar and pgm2ps installed on your system in /usr/local/bin. Later +you can uninstall by typing "make uninstall" the same way as you typed +"make install". + +Encoding (writing) +------------------ +Run + +./optar other_guys.ogg other_guys.ogg + +which will produce files: + +other_guys.ogg_0001.pgm +other_guys.ogg_0002.pgm +other_guys.ogg_0003.pgm +other_guys.ogg_0004.pgm +other_guys.ogg_0005.pgm +other_guys.ogg_0006.pgm + +Now convert them into PostScript using the included pgm2ps tool: +./pgm2ps *.pgm + +Print them using a 600dpi (or more) laser printer. Inkjet or dot matrix was +never tested and will not probably work at the pre-defined data density. See +"Changing the format" below. + +Please note that the file will be padded by zeroes and the original length will +be lost. Pack your data with tar if you store data that are sensitive to this. + +Decoding (reading) +------------------ + +Clean and polish the scanner glass with rubbing alcohol and paper towel. Put +yellow pages on the scanner lid to get sharper picture *). Insert the +page so that the text on the bottom is upright. Scan the pages into +PNG (not JPEG!) on 600dpi (or 1200dpi, slightly better): + +scan_0001.png +scan_0002.png +scan_0003.png +scan_0004.png +scan_0005.png +scan_0006.png + +Read the number sequence (format specification) from any of the papers and feed +it as 1st argument to the optar, 2nd argument is the filename part before the +underscore: + +unoptar 0-65-93-24-3-1-2-24 scan > out.ogg + +Then play out.ogg with mplayer. You should get first about 41 seconds from the +Ogg Vorbis file. + +*) In the scanner I tried (Canoscan), the lid didn't seem to be heavy enough to +press the paper down completely - there were blurry spots in the picture. +Without yellow pages I got 526 reparable bad bits bad from 3.2 million. With +yellow pages the blurry spots were much sharper and I got only 261 reparably +bad bits! + +Please note the data are padded with zeroes so the original information +about file length is lost. If your data format doesn't like this then first +pack your data with tar. + +A4 <-> US Letter +---------------- +Change the convert parameters in pgm2ps (see comments). Change XCROSSES +and YCROSSES in optar.h (see comments). Recompile. Then you can use US Letter +instead of A4. + +Changing the format +------------------- +If your printer is low quality and you are getting irreparable bits, you can +try to format the media to lower capacity. Unfortunately, setting by +commandline is not implemented yet. Change XCROSSES and YCROSSES in optar.h to +lower values which yields bigger pixels and lower capacity per page, but higher +reliability. Make sure they are in roughly the same proportion as before, +otherwise you get nonsquare pixels and unnecessary waste of channel capacity. + +You can also change the decoding parameters in unoptar.c (look for MAGIC +CONSTANTS) in attempt to read a difficult recording: unsharp_mask, +unsharp_dist, sync_white_cut, white_cut, minmax_filter, pixel_blur, cross_trim. + +Future improvement +================== +- manpage could be written for optar and unoptar +- commandline help (-h) could be written for optar and unoptar +- the format could be made configurable. Now it's stored in the optar.h +- the magic constants could be changed by commandline options. Now they are + stored in unoptar.c. +- Golay code decoding could be rewritten faster, using a sophisticated + algorithm (Kasami algorithm?) +- Easy support for multiple pages per page, so it can be read by a digital + camera. Currently it cannot since digital camera blurs at the sides of + the picture. + +(c) GPL 2007 Karel 'Clock' Kulhavy of Twibright Labs +See COPYING for the text of the GPL license. +e-mail: clock (at) twibright (dot) com +Twibright Optar homepage: http://ronja.twibright.com/optar/ diff --git a/common.c b/common.c new file mode 100644 index 0000000..8ffb282 --- /dev/null +++ b/common.c @@ -0,0 +1,69 @@ +/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */ + +#include /* fprintf */ + +#include "optar.h" + +/* Coordinates don't count with the border - 0,0 is upper left corner of the + * first cross! */ +int is_cross(unsigned x, unsigned y) +{ + x%=CPITCH; + y%=CPITCH; + return (x<2*CHALF&&y<2*CHALF); +} + +/* Returns the coords relative to the upperloeftmost cross upper left corner + * pixel! If you have borders, you have to add them! */ +void seq2xy(int *x, int *y, unsigned seq) +{ + unsigned rep; /* Repetition - number of narrow strip - wide strip pair, + starting with 0 */ + + if (seq>=TOTALBITS){ + /* Out of range */ + *x=-1; + *y=-1; + return; + } + /* We are sure we are in range. Document structure: + * - narrow strip (between top row of crosses), height is + * 2*CHALF + * - wide strip, height is CPITCH-2*CHALF + * - the above repeats (YCROSSES-1)-times + * - narrow strip + */ + rep=seq/REPPIXELS; + seq=seq%REPPIXELS; + + *y=REPHEIGHT*rep; + /* Now seq is sequence in the repetition pair */ + if (seq>=NARROWPIXELS){ + /* Second, wide strip of the pair */ + *y+=NARROWHEIGHT; + seq-=NARROWPIXELS; + /* Now seq is sequence in the wide strip */ + *y+=seq/WIDEWIDTH; + *x=seq%WIDEWIDTH; + }else{ + /* First, narrow strip of the pair */ + unsigned gap; /* Horizontal gap number */ + *x=2*CHALF; + *y+=seq/NARROWWIDTH; + seq%=NARROWWIDTH; + /* seq is now sequence in the horiz. line */ + gap=seq/GAPWIDTH; + *x+=gap*CPITCH; + seq%=GAPWIDTH; + /* seq is now sequence in the gap */ + *x+=seq; + } +} + +/* Golay codes */ +unsigned long golay(unsigned long in) +{ + return golay_codes[in&4095]; +} + + diff --git a/font.h b/font.h new file mode 100644 index 0000000..49e0b7a --- /dev/null +++ b/font.h @@ -0,0 +1,2529 @@ +/* GIMP header image file format (INDEXED): /var/www/htdocs/ronja/trunk/grx/optar/font.h */ + +static unsigned int width = 1500; +static unsigned int height = 24; + +/* Call this macro repeatedly. After each use, the pixel data can be extracted */ + +#define HEADER_PIXEL(data,pixel) {\ + pixel[0] = header_data_cmap[(unsigned char)data[0]][0]; \ + pixel[1] = header_data_cmap[(unsigned char)data[0]][1]; \ + pixel[2] = header_data_cmap[(unsigned char)data[0]][2]; \ + data ++; } + +static char header_data_cmap[256][3] = { + { 0, 0, 0}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255}, + {255,255,255} + }; +static char header_data[] = { + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 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See golay.svg for + * a drawing. */ + {/* 1 */ 2, 3, 4, 5, 6}, + {/* 2 */ 1, 3, 6, 7, 8}, + {/* 3 */ 1, 2, 4, 8, 9}, + {/* 4 */ 1, 3, 5, 9, 10}, + {/* 5 */ 1, 4, 6, 10, 11}, + {/* 6 */ 1, 2, 5, 7, 11}, + {/* 7 */ 2, 6, 8, 11, 12}, + {/* 8 */ 2, 3, 7, 9, 12}, + {/* 9 */ 3, 4, 8, 10, 12}, + {/* 10 */ 4, 5, 9, 11, 12}, + {/* 11 */ 5, 6, 7, 10, 12}, + {/* 12 */ 7, 8, 9, 10, 11} +}; + +unsigned parities[12]; + +int main(int argc, char ** argv) +{ + unsigned mask, p, f; + unsigned input; + unsigned prty; /* parity */ + + for (p=0;p<12;p++){ + mask=0xfff; /* All dodecahedron faces */ + for (f=0;f<5;f++) + mask^=1U<<(dodecahedron[p][f]-1); + parities[p]=mask; + } + + printf("unsigned long golay_codes[4096]={\n"); + + for (input=0;input<4096;input++){ + unsigned n_ones; + unsigned long codeword; + + prty=0; + for (p=0;p<12;p++){ + prty<<=1; + prty|=parity(input&parities[p]); + } + codeword=((unsigned long)input<<12)|prty; + n_ones=ones(codeword); + printf((input==4095?"0x%06lx\n":"0x%06lx,\n"),codeword); + assert(n_ones==0 + ||n_ones==8 + ||n_ones==12 + ||n_ones==16 + ||n_ones==24); + } + + printf("};\n"); + return 0; +} diff --git a/golay.svg b/golay.svg new file mode 100644 index 0000000..87a70d1 --- /dev/null +++ b/golay.svg @@ -0,0 +1,1298 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 1 + + + 2 + + + 3 + + + 4 + + + 5 + + + 6 + + + 7 + + + 8 + + + 9 + + + 10 + + + 11 + + + 12 + + + + Twibright Labs + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Dodecahedron for the Golay code + + diff --git a/optar.c b/optar.c new file mode 100644 index 0000000..b7739ad --- /dev/null +++ b/optar.c @@ -0,0 +1,323 @@ +/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */ + +#include /* getchar */ +#include /* exit */ +#include /* memcpy */ +#include /* assert */ + +#define width font_width +#define height font_height +#include "font.h" +#undef width +#undef height + +#include "optar.h" +#include "parity.h" +#define HEIGHT (2*BORDER+DATA_HEIGHT+TEXT_HEIGHT) +#define TEXT_HEIGHT 24 + +static unsigned char ary[WIDTH*HEIGHT]; +static unsigned char *file_label=(unsigned char *)""; /* The filename written in the + file_label */ +static char *output_filename; /* The output filename */ +static unsigned output_filename_buffer_size; +static unsigned char *base=(unsigned char *)"optar_out"; /* Output filename base */ +static unsigned file_number; +FILE *output_stream; +FILE *input_stream; +unsigned n_pages; /* Number of pages calculated from the file length */ + +void dump_ary(void) +{ + fprintf(output_stream, + "P5\n" + "%u %u\n" + "255\n" + ,WIDTH, HEIGHT); + + fwrite(ary, sizeof(ary), 1, output_stream); +} + +/* Only the LSB is significant. Writes hamming-encoded bits. The sequence number + * must not be out of range! */ +void write_channelbit(unsigned char bit, unsigned long seq) +{ + int x,y; /* Positions of the pixel */ + + bit&=1; + bit=-bit; + bit=~bit; /* White=bit 0, black=bit 1 */ + seq2xy(&x, &y, seq); /* Returns without borders! */ + x+=BORDER; + y+=BORDER; + ary[x+y*WIDTH]=bit; + seq++; +} + +/* Groups into two groups of bits, 0...bit-1 and bit..., and then makes + * a gap with zero between them by shifting the higer bits up. */ +unsigned long split(unsigned long in, unsigned bit) +{ + unsigned long high; + + high=in; + in&=(1UL<=3 + in=split(in,4); +#if FEC_ORDER>=4 + in=split(in,8); +#if FEC_ORDER>=5 + in=split(in,16); + in|=parity(in&0xffff0000)<<16; +#endif + in|=parity(in&0xff00ff00)<<8; +#endif + in|=parity(in&0xf0f0f0f0)<<4; +#endif + in|=parity(in&0xcccccccc)<<2; + in|=parity(in&0xaaaaaaaa)<<1; + in|=parity(in); + return in; +} + +void border(void) +{ + unsigned c; + char *ptr=(char *)(void *)ary; + + memset(ptr,0,BORDER*WIDTH); + ptr+=BORDER*WIDTH; + for (c=DATA_HEIGHT;c;c--){ + memset(ptr,0,BORDER); + ptr+=WIDTH; + memset(ptr-BORDER,0,BORDER); + } + memset(ptr,0,TEXT_HEIGHT*WIDTH); + ptr+=TEXT_HEIGHT*WIDTH; + /* BORDER bytes into the bottom border */ + memset(ptr,0,BORDER*WIDTH); +} + +void cross(x,y) +{ + unsigned char *ptr=ary+y*WIDTH+x; + unsigned c; + + for (c=CHALF;c;c--,ptr+=WIDTH){ + memset(ptr,0,CHALF); + memset(ptr+CHALF,0xff,CHALF); + memset(ptr+CHALF*WIDTH,0xff,CHALF); + memset(ptr+CHALF*(WIDTH+1),0,CHALF); + } +} + +void crosses(void) +{ + unsigned x,y; + + for (y=BORDER;y<=HEIGHT-TEXT_HEIGHT-BORDER-2*CHALF;y+=CPITCH) + for (x=BORDER;x<=WIDTH-BORDER-2*CHALF;x+=CPITCH) + cross(x,y); +} + +/* x is in the range 0 to DATA_WIDTH-1 */ +void text_block (destx, srcx, width) +{ + int x, y; + unsigned char *srcptr; + unsigned char *destptr; + + if (destx+width>DATA_WIDTH) return; /* Letter doesn't fit */ + + srcptr=(unsigned char *)(void *)header_data+srcx; + destptr=ary+WIDTH*(BORDER+DATA_HEIGHT)+BORDER+destx; + + for (y=0;y=' '&&*ptr<=127){ + text_block(x,TEXT_WIDTH*(*ptr-' '), TEXT_WIDTH); + x+=TEXT_WIDTH; + } + } + +} + +void format_ary(void) +{ + memset(ary, 0xff, sizeof(ary)); /* White */ + border(); + crosses(); + label(); + +} + +/* Always formats ary. Dumps it if it's not the first one. */ +void new_file(void) +{ + if (file_number){ + dump_ary(); + fclose(output_stream); + } + if (file_number>=9999){ + fprintf(stderr,"optar: too many pages - 10,000 or more\n"); + exit(1); + } + snprintf(output_filename,output_filename_buffer_size + ,"%s_%04u.pgm",(char *)(void *)base,++file_number); + output_stream=fopen(output_filename,"w"); + if (!output_stream){ + fprintf(stderr,"optar: cannot open %s for writing.\n", output_filename); + exit(1); + } + format_ary(); +} + +/* That's the net channel capacity */ +void write_payloadbit(unsigned char bit) +{ + static unsigned long accu=1; + static unsigned long hamming_symbol; + + accu<<=1; + accu|=bit&1; + if (accu&(1UL<=FEC_SYMS){ + /* We couldn't write into the page, we need to make + * another one */ + new_file(); + hamming_symbol=0; + } + + /* Write the symbol into the page */ + for (shift=FEC_LARGEBITS-1;shift>=0;shift--) + write_channelbit(accu>>shift + , hamming_symbol+(FEC_LARGEBITS-1-shift) + *FEC_SYMS); + accu=1; + hamming_symbol++; + } +} + +void write_byte(unsigned char c) +{ + int bit; + + for (bit=7; bit>=0;bit--) + write_payloadbit(c>>bit); +} + +/* Prints the text at the bottom */ +/* Makes one output file. */ +void feed_data(void) +{ + int c; + + while((c=fgetc(input_stream))!=EOF){ + write_byte(c); + } + + /* Flush the FEC with zeroes */ + for (c=FEC_SMALLBITS-1;c;c--){ + write_payloadbit(0); + } + + dump_ary(); + fclose(output_stream); + +} + +void open_input_file(char *fname) +{ + input_stream=fopen(fname,"r"); + if (!input_stream){ + fprintf(stderr,"optar: cannot open input file %s: " + ,fname); + perror(""); + exit(1); + } + if (fseek(input_stream, 0, SEEK_END)){ + fprintf(stderr,"optar: cannot seek to the end of %s: " + ,fname); + perror(""); + exit(1); + } + n_pages=(((unsigned long)ftell(input_stream)<<3)+NETBITS-1) + /NETBITS; + if (fseek(input_stream,0, SEEK_SET)){ + fprintf(stderr,"optar: cannot seek to the beginning of %s: " + ,fname); + perror(""); + exit(1); + } +} + +/* argv format: + * 1st arg - input file + * 2nd arg(optional) - label and output filename base */ +int main(int argc, char **argv) +{ + + if (argc<2){ + fprintf(stderr,"Usage: optar [filename base]\n"); + exit(1); + } + open_input_file(argv[1]); + + if (argc>=3) file_label=base=(void *)argv[2]; + output_filename_buffer_size=strlen((char *)(void *)base)+1+4+1+3+1; + output_filename=malloc(output_filename_buffer_size); + if (!output_filename){ + fprintf(stderr,"Cannot allocate output filename\n"); + exit(1); + } + new_file(); + feed_data(); + fclose(input_stream); + free(output_filename); + return 0; +} diff --git a/optar.h b/optar.h new file mode 100644 index 0000000..b525405 --- /dev/null +++ b/optar.h @@ -0,0 +1,77 @@ +/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */ + +#define MIN(x,y) ((x)<(y)?(x):(y)) +#define MAX(x,y) ((x)>(y)?(x):(y)) + +#define BORDER 2 /* In pixels. Thickness of the border */ +#define CHALF 3 /* Size of the cross half. Size of the cross is CHALF*2 x CHALF*2. + */ +#define CPITCH 24 /* Distance between cross centers */ + +/* XCROSSES A4 65, US Letter 67. */ +#define XCROSSES 65 /* Number of crosses horizontally */ +/* YCROSSES A4 93, US Letter 87. */ +#define YCROSSES 93 /* Number of crosses vertically */ + +#define DATA_WIDTH (CPITCH*(XCROSSES-1)+2*CHALF) /* The rectangle occupied by + the data and crosses */ +#define DATA_HEIGHT (CPITCH*(YCROSSES-1)+2*CHALF) +#define WIDTH (2*BORDER+DATA_WIDTH) /* In pixels, including the border */ +/* In pixels, including the border and the label */ + +#define TEXT_WIDTH 13 /* Width of a single letter */ + +/* Definitions for seq2xy */ + +/* Properties of the narrow horizontal strip, with crosses */ +#define NARROWHEIGHT (2*CHALF) +#define GAPWIDTH (CPITCH-2*CHALF) +#define NARROWWIDTH (GAPWIDTH*(XCROSSES-1)) /* Useful width */ +#define NARROWPIXELS (NARROWHEIGHT*NARROWWIDTH) /* Useful pixels */ + +/* Properties of the wide horizontal strip, without crosses */ +#define WIDEHEIGHT GAPWIDTH +#define WIDEWIDTH (WIDTH-2*BORDER) +#define WIDEPIXELS (WIDEHEIGHT*WIDEWIDTH) + +/* Amount of raw payload pixels in one narrow-wide strip pair */ +#define REPHEIGHT (NARROWHEIGHT+WIDEHEIGHT) +#define REPPIXELS (WIDEPIXELS+NARROWPIXELS) + +/* Total bits before hamming including the unused */ +#define TOTALBITS ((long)REPPIXELS*(YCROSSES-1)+NARROWPIXELS) + +/* Hamming codes with parity */ +#define FEC_ORDER 1 /* Can be 2 to 5 inclusive. + 5 is 26/32, + 4 is 11/16, + 3 is 4/8, + 2 is 4/1 + 1 is golay codes */ +#if FEC_ORDER==1 +/* Golay */ +#define FEC_LARGEBITS 24 +#define FEC_SMALLBITS 12 +#else +/* Hamming */ +#define FEC_LARGEBITS (1<>16; + in^=in>>8; + in^=in>>4; + in^=in>>2; + in^=in>>1; + return in&1; +} + +/* Counts number of '1' bits */ +unsigned ones(unsigned long in) +{ + in-=((in>>1)&0x55555555UL); /* 2-bit groups result with max. 10 */ + in=(in&0x33333333UL)+((in&0xccccccccUL)>>2); /* 4-bit groups with + max. 100 */ + in+=in>>4; + in&=0x0f0f0f0fUL; /* 8-bit groups with max. 1000 */ + in+=in>>8; + in+=in>>16; + return in&0x3f; +} + + diff --git a/parity.h b/parity.h new file mode 100644 index 0000000..a8ce577 --- /dev/null +++ b/parity.h @@ -0,0 +1,7 @@ +/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */ + +extern unsigned long parity(unsigned long in); + +/* Counts number of '1' bits */ +extern unsigned ones(unsigned long in); + diff --git a/pgm2ps b/pgm2ps new file mode 100644 index 0000000..50497ef --- /dev/null +++ b/pgm2ps @@ -0,0 +1,17 @@ +#!/bin/sh +while [ $# -gt 0 ]; do + target=`echo "$1" | sed -e 's/\.pgm$/.ps/'` + echo Converting "$1" to "$target" +# We assume roughly 0.25 inch border (18) on each side. +# A4 is 595.27559 x 841.889763 (595 x 842) +# Letter is 8.5x11 inches or 612x792. + +# Change to 556.56x807.12+19.22+17.44 for A4 and +# 573.84x755.28+19.08+18.36 for US Letter. +# Don't forget to change XCROSSES and YCROSSES in optar.h and +# recompile. + convert -page 556.56x807.12+19.22+17.44 "$1" "$target" +# convert -page 573.84x755.28+19.08+18.36 "$1" "$target" + shift +done + diff --git a/unoptar.c b/unoptar.c new file mode 100644 index 0000000..5cd6e76 --- /dev/null +++ b/unoptar.c @@ -0,0 +1,1696 @@ +/* (c) GPL 2007 Karel 'Clock' Kulhavy, Twibright Labs */ + +#include /* printf */ +#include /* malloc */ +#include /* floor */ +#include /* memcpy */ +#include /* assert */ +#include /* libpng. Sometimes is in /usr/local/include/libpng/png.h, but that is taken + care of using -I/usr/local/include/libpng in the Makefile. */ + +#include "optar.h" +#include "parity.h" + +/* Crosses will be resynced with precision of FINESTEP pixels */ +#define FINE_CROSS_RESYNC +#define FINESTEP 0.25 +/* Define to disable repairing bit by Hamming codes */ + +#define MIN(x,y) ((x)<(y)?(x):(y)) + +/* Takes only unsigned integers, returns real value, if out of range returns + * white, doens't threshold*/ +#define getpixu(x,y) \ +((x)>=width||(y)>=height?0xff:ary[(x)+(y)*width]) + +/* Integers in corners */ +#define writepix(x,y,c) writepixu((unsigned)floor(x),(unsigned)floor(y),c) +/* If out of range, doesn't write anythinig. Integers are in pixel upper + * left corners. */ +#define writepixu(x,y,c) {if ((x)>1))/(width*height); + fprintf(stderr,"Average pixel value %u\n", average); +} + +/* Analyzes, determines the cut level */ +static void analyze_cutlevel(void) +{ + float white, black; + unsigned long black_pixels, white_pixels; + int i; + float white_rms, black_rms; /* At the end they will be RMS of the + distance from average */ +#define MAXITER 32 + int iter; /* max. MAXITER iterations */ + int lastcutlevel; + + fill_global_cutlevel=global_cutlevel=average; + + /* The second guess uses global_cutlevel from the first guess */ + for (iter=0;iterabs(y)){ + /* Horizontal */ + deg=180/M_PI*asin(y); + if (x<0) deg=180-deg; + }else{ + /* Vertical */ + deg=180/M_PI*asin(x); + if (y<0) deg=deg-90; + else deg=90-deg; + } + return deg; +} + +/* Puts it -180...+180 */ +static double normalize_angle(double a) +{ + return remainder(a,360); +} + +static void find_corners(void) +{ + int x,y; + + diag_scan(&x, &y, 0, 0, 1, 1); + if (x<0){ + static char failure []="failure_debug.pgm"; + fprintf(stderr,"Error: cannot find upper left corner\n"); +fail: + fprintf(stderr,"See failure_debug.pgm why.\n"); + memcpy(newary, ary, (unsigned long)width*height); + dump_newary(failure); + exit(1); + } + corners[0][0]=x; + corners[0][1]=y; + + diag_scan(&x, &y, width-1, 0, -1, 1); + if (x<0){ + fprintf(stderr,"Error: cannot find upper right corner\n"); + goto fail; + } + corners[1][0]=x+1; + corners[1][1]=y; + + diag_scan(&x, &y, 0, height-1, 1, -1); + if (x<0){ + fprintf(stderr,"Error: cannot find lower left corner\n"); + goto fail; + } + corners[2][0]=x; + corners[2][1]=y+1; + + diag_scan(&x, &y, width-1, height-1, -1, -1); + if (x<0){ + fprintf(stderr,"Error: cannot find lower right corner\n"); + goto fail; + } + corners[3][0]=x+1; + corners[3][1]=y+1; + + leftedge=MIN(corners[0][0],corners[2][0]); + rightedge=MAX(corners[1][0],corners[3][0]); + topedge=MIN(corners[0][1],corners[1][1]); + bottomedge=MAX(corners[2][1],corners[3][1]); + + hpixel=(corners[1][0]+corners[3][0] + -corners[0][0]-corners[0][0])/2.0/WIDTH; + vpixel=(corners[2][1]+corners[3][1] + -corners[0][1]-corners[1][1])/2.0/format_height; + fprintf(stderr,"One bit is %G horizontal pixels and %G " + "vertical pixels.\n", hpixel, vpixel); + + + { + unsigned vchalf, hchalf; + + /* Take only half to prevent spurious resync to an edge of the + * cross when the data mimic the other half of the cross. */ + hchalf=hpixel*CHALF*0.5; + vchalf=vpixel*CHALF*0.5; + + chalf=MIN(hchalf, vchalf); + /* Round to zero to make sure we don't catch any chaff */ + + /* Trim the cross by some fraction of input pixel to remove + * the area affected by crosstalk. */ + hchalf=hpixel*(CHALF-cross_trim); + vchalf=vpixel*(CHALF-cross_trim); + + chalf_fine=MIN(hchalf, vchalf); + } + + /* Calculate the pixel vectors */ + pixelhx=((double)corners[1][0]+(double)corners[3][0] + -(double)corners[0][0]-(double)corners[2][0])/2; + pixelhy=((double)corners[1][1]+(double)corners[3][1] + -(double)corners[0][1]-(double)corners[2][1])/2; + pixelvx=((double)corners[2][0]+(double)corners[3][0] + -(double)corners[0][0]-(double)corners[1][0])/2; + pixelvy=((double)corners[2][1]+(double)corners[3][1] + -(double)corners[0][1]-(double)corners[1][1])/2; + + /* Normalize the horizontal vector (which may not be exactly + * horizontal */ + normalize_vector(&pixelhx, &pixelhy); + /* Normalize the vertical vector (which may not be exactly + * vertical */ + normalize_vector(&pixelvx, &pixelvy); + fprintf(stderr,"Input horizontal pixel vector %G,%G, vertical %G,%G." + " skew %G deg, perpendicularity %G deg.\n", + pixelhx, pixelhy, pixelvx, pixelvy + ,normalize_angle(angle(pixelhx, -pixelhy) + +angle(pixelvx, -pixelvy)+90)/2 + ,angle(pixelhx, -pixelhy)-angle(pixelvx, -pixelvy)); + + { + unsigned long bytes=(long)(4*chalf+1)*(4*chalf+1) + *sizeof*search_area; + search_area=malloc(bytes); + if (!search_area){ + fprintf(stderr, + "Cannot allocate search area of %lu bytes\n", + bytes); + exit(1); + + } + } + fprintf(stderr,"Allocating search area of %u x %u (%u) pixels.\n", + chalf<<1, chalf<<1, (chalf*chalf)<<2); + + fprintf(stderr,"Upper corners at %lu, %lu and %lu, %lu,\n" + "lower corners at %lu, %lu and %lu, %lu.\n" + "Cross half for searching is %d x %d input pixels.\n", + corners[0][0], corners[0][1], corners[1][0], corners[1][1], + corners[2][0], corners[2][1], corners[3][0], corners[3][1], + chalf, chalf); + +} + +static double bilinear(double ul, double ur, + double ll, double lr, + double hpar, double vpar) +{ + double u,l; /* Upper, lower */ + + u=ur*hpar+ul*(1-hpar); + l=lr*hpar+ll*(1-hpar); + return l*vpar+u*(1-vpar); +} + +static float bilinearf(float ul, float ur, + float ll, float lr, + float hpar, float vpar) +{ + float u,l; /* Upper, lower */ + + u=ur*hpar+ul*(1-hpar); + l=lr*hpar+ll*(1-hpar); + return l*vpar+u*(1-vpar); +} + +/* x,y with integers in centers of pixels */ +static float get_pixel_interp(double x, double y) +{ + unsigned xi, yi; /* Integer versions, rounded down */ + + /* Supports even extrapolation, but should be never necessary */ + if (x<0) xi=0; else xi=floor(x); + if (y<0) yi=0; else yi=floor(y); + + /* Make it faster, only little precision needed. */ + return bilinearf(getpixu(xi,yi), getpixu(xi+1,yi), + getpixu(xi,yi+1),getpixu(xi+1,yi+1), + x-xi, y-yi); +} + +/* Samples pixels and performs correction(s) */ +static float pixel_correct_sample(double x, double y) +{ + float val; + float avg; /* First sum, later average */ + double hdist, vdist; + + hdist=hpixel*unsharp_dist; + vdist=vpixel*unsharp_dist; + + avg=get_pixel_interp( + PSHIFTX(x, -hdist, 0), + PSHIFTY(y, -hdist, 0)); + avg+=get_pixel_interp( + PSHIFTX(x, hdist, 0), + PSHIFTY(y, hdist, 0)); + avg+=get_pixel_interp( + PSHIFTX(x, 0, vdist), + PSHIFTY(y, 0, vdist)); + avg+=get_pixel_interp( + PSHIFTX(x, 0, -vdist), + PSHIFTY(y, 0, -vdist)); + avg/=4; + + + val=get_pixel_interp(x,y); + val+=unsharp_mask*(val-avg); /* Emphasize the distance from average */ + return val; +} + +/* Returns difference from global_cutlevel. Integers in centers of pixels. Interpolates + * for nonintegral coordinates. */ +static float diffpix(double x, double y) +{ + return get_pixel_interp(x,y)-global_cutlevel; +} + +/* Calculates a correlation with a cross. x and y are coords of the cross + * center with integers in UL corners of pixels. */ +static float cross_correl(double x, double y) +{ + double dx, dy; + float sum =0; + + /* -0.5 for conversion corners -> centers, +0.5 for conversion + * cross center -> sample point 1/2 pixel away from the cross + * center -> No addition at all */ + + for (dx=0;dx=0); + assert (xpos<=4*chalf); + assert (ypos>=0); + assert (ypos<=4*chalf); + + return search_area[ypos*(4*chalf+1)+xpos]; +} + +/* xpos says the cross offset. 0,0 means at the original position from around + * which the search_area was loaded. The range is -chalf to chalf + * (inclusive). The input must be in that range, otherwise crash */ +static float cross_correl_search(int xpos, int ypos) +{ + float sum; + + assert(xpos>=-chalf); + assert(xpos<=chalf); + assert(ypos>=-chalf); + assert(ypos<=chalf); + + /* Normalize the xpos and ypos to mean the cross center in array + * indices. 0 means array left edge, 2*chalf array center, 4*chalf array + * right edge. */ + + xpos+=2*chalf; + ypos+=2*chalf; + + /* Center */ + sum=-4*getsearch(xpos,ypos); + + /* Middles of sides */ + sum+=2*( + getsearch(xpos-chalf, ypos)+ + getsearch(xpos+chalf, ypos)+ + getsearch(xpos, ypos-chalf)+ + getsearch(xpos, ypos+chalf) + ); + + /* Corners */ + sum-=( + getsearch(xpos-chalf, ypos-chalf)+ + getsearch(xpos-chalf, ypos+chalf)+ + getsearch(xpos+chalf, ypos-chalf)+ + getsearch(xpos+chalf, ypos+chalf) + ); + + return sum; +} + +/* After this, pixel [0][0] means integral from [0][0] to [1][1] (!), etc. */ +static void integrate_search_area(void) +{ + int x, y; + float *ptr; + + /* Horizontal integration */ + ptr=search_area; + for (y=0;y<=4*chalf;y++){ + ptr++; + for (x=1;x<=4*chalf;x++){ + ptr[0]+=ptr[-1]; + ptr++; + } + } + + ptr=search_area+4*chalf+1; + + /* Vertical integration */ + for (;ptrglobal_cutlevel){ + /* White */ + white_rms+=(val-global_cutlevel)*(val-global_cutlevel); + whitepixels++; + }else if (valmax) + { + max=result; + xoffmax=xoff; + yoffmax=yoff; + } + } + xmax=PSHIFTX(coordpair[0], xoffmax, yoffmax); + ymax=PSHIFTY(coordpair[1], xoffmax, yoffmax); + +#ifdef FINE_CROSS_RESYNC +#define HALFRANGE (0.5/FINESTEP) /* 0.5 means 0.5 of small input pixel - no + need to search more since then it would be + caught by the neighbouring coarse search + try. */ + /* Load the fine search initial maximum position */ + xoffmax=0; + yoffmax=0; + + /* This must be here since cross_correl and cross_correl_search + * return the result scaled by a different factor. */ + max=cross_correl(xmax,ymax); + + /* Fine search, FINESTEP pixels/ step. Counting in 0.25 steps */ + for (xoff=-HALFRANGE;xoff<=HALFRANGE;xoff++) + for (yoff=-HALFRANGE;yoff<=HALFRANGE;yoff++){ + /* This is not using the search area anymore! */ + result=cross_correl( + PSHIFTX(xmax, (double)xoff*FINESTEP + ,(double)yoff*FINESTEP) + ,PSHIFTY(ymax, (double)xoff*FINESTEP + ,(double)yoff*FINESTEP)); + if (result>max){ + max=result; + xoffmax=xoff; + yoffmax=yoff; + } + } + /* Save the fine search result */ + xmax=PSHIFTX(xmax, (double)xoffmax*FINESTEP, (double)yoffmax*FINESTEP); + ymax=PSHIFTY(ymax, (double)xoffmax*FINESTEP, (double)yoffmax*FINESTEP); + +#endif /* FINE_CROSS_RESYNC */ + + /* Store the output */ + coordpair[0]=xmax; + coordpair[1]=ymax; +} + +static void sync_crosses(void) +{ + unsigned cx,cy; /* Cross number */ + double rightx, righty, downx, downy; /* Two cross pitch vectors */ + + /* Calculate the estimated cross pitch vectors */ + rightx=((double)corners[1][0]+corners[3][0]-corners[0][0]-corners[2][0]) + /2*CPITCH/WIDTH; + righty=((double)corners[1][1]+corners[3][1]-corners[0][1]-corners[2][1]) + /2*CPITCH/WIDTH; + downx=((double)corners[2][0]+corners[3][0]-corners[0][0]-corners[1][0]) + /2*CPITCH/format_height; + downy=((double)corners[2][1]+corners[3][1]-corners[0][1]-corners[1][1]) + /2*CPITCH/format_height; + + /* Load the upper left cross with an estimate of it's position */ + crosses[0][0][0]=bilinear( + corners[0][0], corners[1][0], + corners[2][0], corners[3][0], + (double)(BORDER+CHALF)/WIDTH, + (double)(BORDER+CHALF)/format_height); + crosses[0][0][1]=bilinear( + corners[0][1], corners[1][1], + corners[2][1], corners[3][1], + (double)(BORDER+CHALF)/WIDTH, + (double)(BORDER+CHALF)/format_height); + + fprintf(stderr,"Finding crosses (%u lines), numbers indicate " + "individual cutlevels:\n", YCROSSES); + + for (cy=0;cy0){ + /* Copy from left */ + crosses[cx][cy][0]=crosses[cx-1][cy][0]+rightx; + crosses[cx][cy][1]=crosses[cx-1][cy][1]+righty; + }else if (cy>0){ + /* Copy from above */ + crosses[cx][cy][0]=crosses[cx][cy-1][0]+downx; + crosses[cx][cy][1]=crosses[cx][cy-1][1]+downy; + }/* else already preloaded */ + resync_cross(crosses[cx][cy]); + cross_stats(cx, cy); + } + putc('\n',stderr); + } +} + +/* x,y coords in bit matrix. 0,0 is in the upper left cross UL corner. + * Returns pixel position with integers in centers of pixels. Interpolates + * also the cutlevel */ +static void bit_coord(double *xout, double *yout, float *cutlevel, + int x, int y) +{ + unsigned cx, cy; /* Cross number */ + double xd, yd; + double xrem, yrem; + + /* First find the cross numbers */ + /* Division of negative numbers is probably undefined in C! */ + if (xXCROSSES-2) cx=XCROSSES-2; + if (cy>YCROSSES-2) cy=YCROSSES-2; + + /* Now subtrack cross coordinate */ + x-=cx*CPITCH+CHALF; + y-=cy*CPITCH+CHALF; + /* x,y now the remainders. Can be negative or more than CPITCH! */ + + /* Calculate double precision remainders about from 0 to 1 (not always) */ + xrem=((double)x+0.5)/CPITCH; + yrem=((double)y+0.5)/CPITCH; + + xd=bilinear( + crosses[cx][cy][0], crosses[cx+1][cy][0], + crosses[cx][cy+1][0],crosses[cx+1][cy+1][0], + xrem, yrem); + yd=bilinear( + crosses[cx][cy][1], crosses[cx+1][cy][1], + crosses[cx][cy+1][1],crosses[cx+1][cy+1][1], + xrem, yrem); + if (cutlevel){ + *cutlevel=bilinearf( + cutlevels[cx][cy], cutlevels[cx+1][cy], + cutlevels[cx][cy+1],cutlevels[cx+1][cy+1], + xrem, yrem); + } + /* xd, yd are now with integers in UL corners of pixels */ + xd-=0.5; + yd-=0.5; + /* xd, yd are now with integers in centers of pixels */ + + *xout=xd; + *yout=yd; +} + +static void read_payload_bit(unsigned char bit) +{ + static unsigned accu=1; + + accu<<=1; + accu|=bit&1; + if (accu&(1<<8)){ + putchar(accu&0xff); + accu=1; + } +} + +#if FEC_ORDER !=1 +/* Cuts out given bit and shifts the upper part */ +static unsigned long shrink(unsigned long in, unsigned bitpos) +{ + unsigned long high; + in&=~(1<>1)|in; +} +#endif + +static void mark_bad_bit(unsigned x, unsigned y, int dir) +{ + int size=floor(2*sqrt(hpixel*vpixel)+0.5); + unsigned u; + int i; + int v=dir?0:255; + + if (dir){ + /* To 1, means black dirt. Upper left edge. */ + for (u=0;u=0); + switch(dir){ + case 0: delim='\''; break; + case 1: delim=','; break; + default: delim=':'; break; + } + fprintf(stderr,"%ld%c%ld ",(long)xd, delim, (long)yd); +} + +static void print_badbit_finish(void) +{ + if (bad_total){ + fprintf(stderr,"\n%lu bits bad from %lu, bit error rate %G%%. " + "%G%% black dirt, %G%% white dirt and " + "%lu (%G%%) irreparable.\n", + bad_total, + USEDBITS, + 100*(double)(bad_total)/USEDBITS, + 100*(double)bad_01/(bad_total), + 100*(double)bad_10/(bad_total), + irreparable, + 100*(double)irreparable/(bad_total)); + } + else fprintf(stderr,"No bad bits!\n"); +#if FEC_ORDER == 1 + fprintf(stderr,"Golay stats\n" + "===========\n" + "0 bad bits %lu\n" + "1 bad bit %lu\n" + "2 bad bits %lu\n" + "3 bad bits %lu\n" + "4 bad bits %lu\n" + "total codewords %lu\n" + , golay_stats[0] + , golay_stats[1] + , golay_stats[2] + , golay_stats[3] + , golay_stats[4] + , golay_stats[0]+golay_stats[1] + +golay_stats[2]+golay_stats[3]+golay_stats[4]); +#endif +} + +void golay_bad_bits(unsigned long right, unsigned long wrong, unsigned + long symno) +{ + int bit; /* 23 MSB, 0 LSB */ + + for (bit=23; bit>=0;bit--){ + if ((right^wrong)&(1UL<>bit)&1); + } + } + + +} + +static unsigned long ungolay(unsigned long in, unsigned long symno) +{ + unsigned data=in>>12; + + if (golay(data)==in){ + golay_stats[0]++; + return data; /* No error */ + } + + /* Search for a symbol that differs in max. 3 positions */ + for (data=0;data<(1<<12);data++){ + unsigned n_ones; + n_ones=ones(golay_codes[data]^in); + if (n_ones<=3){ + /* Found the right answer */ + golay_bad_bits(golay_codes[data],in, symno); + golay_stats[n_ones]++; + return data; + } + + } + + /* "data" is not valid anymore now! */ + + /* Irreparable */ + { + int badbit; + + fputc('\n',stderr); + for (badbit=0;badbit<24;badbit++) + print_badbit(symno, badbit, 2); + fprintf(stderr,"!\n"); + irreparable+=4; + bad_total+=4; + golay_stats[4]++; + return in>>12; + } + +} + +#if FEC_ORDER !=1 +/* symno is just to figure out xy when printing broken bits. Only the + * lowest FEC_LARGEBITS are taken into account on input. */ +static unsigned long unhamming(unsigned long in, unsigned long symno) +{ + unsigned bugpos=0; + + /* Split the shift to make sure that it works even it FEC_LARGEBITS + * is the full size of the type */ + in&=(1UL<<(FEC_LARGEBITS-1)<<1)-1; +#if FEC_ORDER>=5 + bugpos|=parity(in&0xffff0000)<<4; +#endif +#if FEC_ORDER>=4 + bugpos|=parity(in&0xff00ff00)<<3; +#endif +#if FEC_ORDER>=3 + bugpos|=parity(in&0xf0f0f0f0)<<2; +#endif + bugpos|=parity(in&0xcccccccc)<<1; + bugpos|=parity(in&0xaaaaaaaa); + if (bugpos){ + in^=1UL<=5 + in=shrink(in,16); +#endif +#if FEC_ORDER>=4 + in=shrink(in,8); +#endif +#if FEC_ORDER>=3 + in=shrink(in,4); +#endif + in>>=3; + return in; +} +#endif /* FEC_ORDER */ + +static void read_hamming_bit(unsigned char input, unsigned long symno) +{ + static unsigned accubits; + static unsigned long accu; + + accu<<=1; + accu|=input&1; + accubits++; + if (accubits>=FEC_LARGEBITS){ + int shift; +#if FEC_ORDER == 1 + accu=ungolay(accu, symno); +#else + accu=unhamming(accu, symno); +#endif /* FEC_ORDER */ + for (shift=FEC_SMALLBITS-1;shift>=0;shift--) + read_payload_bit(accu>>shift); + accu=0; + accubits=0; + } +} + +void reset_stats(void) +{ + bad_01=0; + bad_10=0; + bad_total=0; + irreparable=0; + memset(golay_stats, 0, sizeof golay_stats); +} + +static void read_syms(void) +{ + unsigned long hamming_sym; /* Hamming symbol sequence number */ + unsigned bit; + unsigned long seq; + int x,y; /* 0,0 is upper left pixel of upper left cross */ + double xcoord, ycoord; /* Integers in centers */ + float pixval; + float local_cutlevel; + + reset_stats(); + + for (hamming_sym=0;hamming_sym255) writeval=255; + else if (writeval<0) writeval=0; + writeval^=255; + + writepix(xcoord+0.5, ycoord+0.5, + writeval); + /* Make a debug dot */ + } + + read_hamming_bit(pixval0;yctr--){ + *dest++=*src++; /* Leftmost pixel */ + for (xctr=width-2;xctr>0;xctr--){ + val=src[0]<<2; + val+=(src[-1]+src[1]+*(src-width)+src[width])<<1; + val+=*(src-1-width)+*(src-width+1) + +src[width-1]+src[width+1]; + val=(val+8)>>4; /* 4+2+2+2+2+1+1+1+1=16 */ + *dest++=val; + src++; + } + *dest++=*src++; /* Rightmost pixel */ + } + memcpy(dest,src,width); /* Bottommost row */ + memcpy(ary,newary,width*height); + fprintf(stderr,"%d ",cycles); + } + if (!blur_cycles) memcpy(newary,ary,width*height); + else fprintf(stderr,"\n"); +} + +/* Shifts half pixel right and down! */ +static void max(void) +{ + unsigned char *ptr, *end, *linestart; + unsigned long yctr; + + ptr=ary+(unsigned long)width*height; + for (yctr=height;yctr;yctr--){ + linestart=ptr-width; + ptr--; + for (; ptr>linestart; ptr--) + ptr[0]=MAX(ptr[0],ptr[-1]); + } + + end=ary+width; + for (ptr=ary+(unsigned long)width*height-1;ptr>=end; ptr--) + ptr[0]=MAX(ptr[0],*(ptr-width)); + +} + +/* Shifts half pixel left and up! */ +static void min(void) +{ + unsigned char *ptr; + unsigned char *end; + unsigned long yctr; + + for (ptr=ary,yctr=height;yctr;yctr--){ + for (end=ptr+width-1;ptrx=x; + wptr->y=y; + wptr++; + if (wptr>=que_end) wptr=que; + if (wptr==rptr){ + fprintf(stderr,"unoptar: Floodfill que overflowed. Search " + "for \"que=malloc\" in the program and increase the " + "size.\n"); + exit(1); + } +} + +/* 1 OK, 0 empty */ +static int que_read(unsigned *x, unsigned *y) +{ + if(wptr==rptr) return 0; /* Empty */ + *x=rptr->x; + *y=rptr->y; + rptr++; + if (rptr>=que_end) rptr=que; + return 1; +} + +static void init_que(void) +{ + rptr=que; + wptr=que; +} + +static void try_copy_white(unsigned x, unsigned y, char test) +{ + unsigned char *destptr; + + if (test&&ary[(unsigned long)y*width+x]>1,0,1); + fill(width-1,0,1); + fill(0,height>>1,1); + fill(0,height-1,1); + fill(width-1, height-1,1); + fill(width-1, height>>1,1); + fill(width>>1, height-1,1); + fprintf(stderr,"white border identified, "); + fill(width>>1, height>>1, 0); + fprintf(stderr,"data area identified, "); + /* Now white parts and the data area are filled with 0xff in newary. */ + erase_dirt(); + free(que); +} + +/* Produces already linear output! */ +void read_png(void) +{ + png_structp png_ptr; + png_infop info_ptr; + double gamma; /* gamma from the info in the file */ + int y1,number_of_passes; + unsigned char **ptrs; + + png_ptr=png_create_read_struct(PNG_LIBPNG_VER_STRING, + NULL, NULL, NULL); + info_ptr=png_create_info_struct(png_ptr); + png_init_io(png_ptr,input_stream); + png_read_info(png_ptr, info_ptr); + width=png_get_image_width(png_ptr,info_ptr); + height=png_get_image_height(png_ptr,info_ptr); + fprintf(stderr,"Input %u x %u pixels, taking %G megabytes for 2 " + "framebuffers.\n" + ,width, height, 2*(float)width*height/1e6); + if (png_get_gAMA(png_ptr,info_ptr, &gamma)) + png_set_gamma(png_ptr, 1.0, gamma); + else + png_set_gamma(png_ptr, 1.0, 0.454545); /* Default gamma */ + { + int bit_depth; + int color_type; + + color_type=png_get_color_type(png_ptr, info_ptr); + bit_depth=png_get_bit_depth(png_ptr, info_ptr); + if (color_type==PNG_COLOR_TYPE_GRAY){ + if (bit_depth<8){ + png_set_expand(png_ptr); + } + if (bit_depth==16){ + png_set_strip_16(png_ptr); + } + } + if (color_type==PNG_COLOR_TYPE_PALETTE){ + png_set_expand(png_ptr); + png_set_rgb_to_gray(png_ptr,1, -1,-1); + /* Default weights to be used */ + } + if (color_type & PNG_COLOR_MASK_ALPHA){ + png_set_strip_alpha(png_ptr); + } + if (color_type==PNG_COLOR_TYPE_RGB || + color_type==PNG_COLOR_TYPE_RGB_ALPHA){ + png_set_rgb_to_gray(png_ptr, 1, -1, -1); + /* Default weights to be used */ + } + + } + /* If the depth is different from 8 bits/gray, make the libpng expand + * it to 8 bit gray. + */ + number_of_passes=png_set_interlace_handling(png_ptr); + png_read_update_info(png_ptr,info_ptr); + ary=malloc((unsigned long)width*height); + newary=malloc((unsigned long)width*height); + if (!(ary&&newary)){ + fprintf(stderr,"Cannot allocate framebuffers.\n"); + exit(1); + } + ptrs=malloc(height*sizeof(*ptrs)); + if (!ptrs){ + fprintf(stderr + ,"Cannot allocate %lu bytes for auxilliary buffer\n" + ,height*(unsigned long)(sizeof*ptrs)); + exit(1); + } + for (y1=0;y1=9999){ + fprintf(stderr,"unoptar: Too many pages - 10,000 or " + "more.\n"); + exit(1); + } + snprintf(longer, alloclen-6,"%s_%04u.png", + base, ++file_number); + /* 6 for "_debug" */ + + input_stream=fopen(longer, "r"); + if (!input_stream) + { + if (file_number==1){ + /* We didn't have any files! */ + fprintf(stderr,"unoptar: cannot open %s: " + ,longer); + free(longer); + perror(""); + exit(1); + }else{ + free(longer); + return; + } + } + process_file(longer); /* Clobbers longer! Automatically closes + input_stream! */ + } + +} + +static void parse_format(char *format) +{ + unsigned dummy; + + sscanf(format,"%u-%u-%u-%u-%u-%u-%u-%u", + &dummy, + &dummy, + &dummy, + &dummy, + &dummy, + &dummy, + &dummy, + &text_height); + fprintf(stderr,"Format: text height=%u\n", text_height); +} + +/* argv: + * input filename base (mandatory). For example "base" will produce + * base_0001.png and base_0001_debug.pgm. + * text height (optional, defaults to 24) + */ +int main(int argc, char **argv) +{ + if (argc<3){ + fprintf(stderr,"usage: unoptar " + " \n"); + exit(1); + } + + parse_format(argv[1]); + /* This must after all dimension-related parameters are decoded. */ + init_dimensions(); + + print_chan_info(); + process_files(argv[2]); + + return 0; +}