2008-07-14 09:15:55 +12:00
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<TITLE>Stacked Symbols</TITLE>
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2008-09-20 18:11:01 +12:00
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2008-07-14 09:15:55 +12:00
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2008-09-20 18:11:01 +12:00
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2008-07-14 09:15:55 +12:00
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<P ALIGN=CENTER>Zint Barcode Generator</P>
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<H1 ALIGN=LEFT>5.2 Stacked Symbologies</H1>
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<P ALIGN=LEFT><A NAME="BASIC"></A><FONT SIZE=5><B>5.2.1 Basic Symbol
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Stacking</B></FONT></P>
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<P ALIGN=LEFT>An early innovation to get more information into a
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symbol, used primarily in the vehicle industry, is to simply stack
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one-dimensional codes on top of each other. This can be achieved at
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the command prompt by giving more than one set of input data. For
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example</P>
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<P ALIGN=LEFT><FONT FACE="Courier, monospace"><FONT SIZE=2>zint -d
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'This' -d 'That'</FONT></FONT></P>
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<P ALIGN=LEFT>will draw two Code 128 symbols, one on top of the
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other. The same result can be achieved using the API by executing the
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<FONT FACE="Courier, monospace">ZBarcode_Encode() </FONT>function
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more than once on a symbol. For example:</P>
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<P ALIGN=LEFT><FONT FACE="Courier, monospace"><FONT SIZE=2>my_symbol->symbology
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= BARCODE_CODE128;<BR>error = ZBarcode_Encode(my_symbol,
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"This");<BR>error = ZBarcode_Encode(my_symbol,
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"That");<BR>error = ZBarcode_Print(my_symbol);</FONT></FONT></P>
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<P ALIGN=LEFT>The example below shows 5 EAN-13 symbols stacked in
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this way.</P>
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<P ALIGN=LEFT><IMG SRC="stacked.png" NAME="graphics1" ALIGN=LEFT WIDTH=190 HEIGHT=100 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="CODE16K"></A><FONT SIZE=5><B>5.2.2 Code 16k
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(EN 12323)</B></FONT></P>
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<P ALIGN=LEFT>A more sophisticated method is to use some type of line
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indexing which indicates to the barcode reader which order the
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symbols should be read. This is demonstrated by Code 16k which uses a
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Code128 based system which can stack up to 16 rows in a block. This
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gives a maximum data capacity of 77 characters or 154 numerical
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digits and includes two modulo-107 check digits. Code 16k also
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supports extended ASCII character encoding in the same manner as Code
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128.</P>
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<P ALIGN=LEFT><IMG SRC="code16k.png" NAME="graphics2" ALIGN=LEFT WIDTH=212 HEIGHT=120 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="PDF417"></A><FONT SIZE=5><B>5.2.3 PDF417 (ISO
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15438)</B></FONT></P>
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<P ALIGN=LEFT>Heavily used in the parcel industry, the PDF417
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symbology can encode a vast amount of data into a small space. Zint
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supports encoding up to the ISO standard maximum symbol size of 925
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codewords which (at error correction level 0) allows a maximum data
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size of 1850 text characters, or 2710 digits. The width of the
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generated PDF417 symbol can be specified at the command line using
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the --cols switch followed by a number between 1 and 30, and the
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amount of check digit information can be specified by using the
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--security switch followed by a number between 0 and 8 where the
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number of codewords used for check information is determined by
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2<SUP>(value + 1)</SUP>. If using the API these values are assigned
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to <FONT FACE="Courier, monospace">option_2</FONT> and <FONT FACE="Courier, monospace">option_1</FONT>
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respectively. The default level of check information is determined by
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the amount of data being encoded. International text support is
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provided using the Latin-1 character set as described in <A HREF="appxa.html">Appendix
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A</A>.</P>
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<P ALIGN=LEFT><IMG SRC="pdf417.png" NAME="graphics3" ALIGN=LEFT WIDTH=240 HEIGHT=54 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="PDF417T"></A><FONT SIZE=5><B>5.2.4 Compact
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PDF417</B></FONT></P>
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<P ALIGN=LEFT>Also known as truncated PDF417. Options are as for
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PDF417 above.</P>
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<P ALIGN=LEFT><IMG SRC="compact417.png" NAME="graphics4" ALIGN=LEFT WIDTH=172 HEIGHT=54 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="MICROPDF"></A><FONT SIZE=5><B>5.2.5
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MicroPDF417 (ISO 24728)</B></FONT></P>
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<P ALIGN=LEFT>A variation of the PDF417 standard, MicroPDF417 is
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intended for applications where symbol size needs to be kept to a
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minimum. 34 pre-defined symbol sizes are available with 1 - 4 columns
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and 4 - 44 rows. The maximum size MicroPDF417 symbol can hold 250
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alphanumeric characters or 366 digits. The amount of error correction
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used is dependant on symbol size. The number of columns used can be
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determined using the <FONT FACE="Courier, monospace">--cols</FONT>
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switch or <FONT FACE="Courier, monospace">option_2</FONT> as with
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PDF417.</P>
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<P ALIGN=LEFT><IMG SRC="micropdf.png" NAME="graphics5" ALIGN=LEFT WIDTH=110 HEIGHT=80 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="RSS14STACK"></A><FONT SIZE=5><B>5.2.6 GS1
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DataBar-14 Stacked (ISO 24724)</B></FONT></P>
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<P ALIGN=LEFT>A stacked variation of the GS1 DataBar-14 symbol
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requiring the same input (see section <A HREF="onedim.html#RSS14">5.1.12.1</A>).
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The height of this symbol is fixed. The data is encoded in two rows
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of bars with a central finder pattern. This symbol can be generated
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with a two-dimensional component to make a <A HREF="composite.html">composite
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symbol</A>.</P>
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<P ALIGN=LEFT><IMG SRC="dbstack.png" NAME="graphics6" ALIGN=LEFT WIDTH=100 HEIGHT=26 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="RSS14OMNI"></A><FONT SIZE=5><B>5.2.7 GS1
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DataBar-14 Stacked Omnidirectional (ISO 24724)</B></FONT></P>
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<P ALIGN=LEFT>Another variation of the GS1 DataBar-14 symbol
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requiring the same input (see section <A HREF="onedim.html#RSS14">5.1.12.1</A>).
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The data is encoded in two rows of bars with a central finder
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pattern. This symbol can be generated with a two-dimensional
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component to make a <A HREF="composite.html">composite symbol</A>.</P>
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<P ALIGN=LEFT><IMG SRC="dbomni.png" NAME="graphics7" ALIGN=LEFT WIDTH=100 HEIGHT=138 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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<P ALIGN=LEFT><A NAME="RSSEXPSTACK"></A><FONT SIZE=5><B>5.2.8 GS1
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DataBar Expanded Stacked (ISO 24724)</B></FONT></P>
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<P ALIGN=LEFT>A stacked variation of the GS1 DataBar Expanded symbol
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for smaller packages. Input is the same as for GS1 DataBar Expanded
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(see section <A HREF="onedim.html#RSSEXP">5.1.12.3</A>). In addition
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the width of the symbol can be altered using the <FONT FACE="Courier, monospace">--cols</FONT>
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switch or <FONT FACE="Courier, monospace">option_2</FONT>. In this
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case the number of columns relates to the number of character pairs
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on each row of the symbol. For symbols with a 2D component the number
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of columns must be at least 2. This symbol can be generated with a
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two-dimensional component to make a <A HREF="composite.html">composite
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symbol</A>.</P>
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<P ALIGN=LEFT><IMG SRC="dbexpand.png" NAME="graphics8" ALIGN=LEFT WIDTH=204 HEIGHT=100 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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2008-09-20 18:11:01 +12:00
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<P ALIGN=LEFT><A NAME="CODABLOCK"></A><FONT SIZE=5><B>5.2.9 Codablock-F</B></FONT></P>
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<P ALIGN=LEFT>Based on Code 128 the Codablock-F symbol supports
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extended ASCII characters in the Latin-1 codeset and features the
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ability to scan and reconstruct the stacked symbol using a standard
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1D barcode reader.</P>
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<P ALIGN=LEFT><IMG SRC="codablock.png" NAME="graphics9" ALIGN=LEFT WIDTH=320 HEIGHT=162 BORDER=0><BR CLEAR=LEFT><BR><BR>
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</P>
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2008-07-14 09:15:55 +12:00
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<P ALIGN=CENTER><A HREF="index.html">Home</A></P>
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<P ALIGN=LEFT>One-Dimensional Symbols</P>
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<P ALIGN=RIGHT>Composite Symbols</P>
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