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Leptonica 1.85.0
Image processing and image analysis suite
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Leptonica 1.85.0
Image processing and image analysis suite
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#include <string.h>#include "allheaders.h"#include "readbarcode.h"Go to the source code of this file.
Macros | |
| #define | DEBUG_CODES 0 |
Functions | |
| static l_int32 | barcodeFindFormat (char *barstr) |
| static l_int32 | barcodeVerifyFormat (char *barstr, l_int32 format, l_int32 *pvalid, l_int32 *preverse) |
| static char * | barcodeDecode2of5 (char *barstr, l_int32 debugflag) |
| static char * | barcodeDecodeI2of5 (char *barstr, l_int32 debugflag) |
| static char * | barcodeDecode93 (char *barstr, l_int32 debugflag) |
| static char * | barcodeDecode39 (char *barstr, l_int32 debugflag) |
| static char * | barcodeDecodeCodabar (char *barstr, l_int32 debugflag) |
| static char * | barcodeDecodeUpca (char *barstr, l_int32 debugflag) |
| static char * | barcodeDecodeEan13 (char *barstr, l_int32 first, l_int32 debugflag) |
| char * | barcodeDispatchDecoder (char *barstr, l_int32 format, l_int32 debugflag) |
| l_int32 | barcodeFormatIsSupported (l_int32 format) |
Dispatcher
char *barcodeDispatchDecoder()
Format Determination
static l_int32 barcodeFindFormat()
l_int32 barcodeFormatIsSupported()
static l_int32 barcodeVerifyFormat()
Decode 2 of 5
static char *barcodeDecode2of5()
Decode Interleaved 2 of 5
static char *barcodeDecodeI2of5()
Decode Code 93
static char *barcodeDecode93()
Decode Code 39
static char *barcodeDecode39()
Decode Codabar
static char *barcodeDecodeCodabar()
Decode UPC-A
static char *barcodeDecodeUpca()
Decode EAN 13
static char *barcodeDecodeEan13()
Definition in file bardecode.c.
| #define DEBUG_CODES 0 |
Definition at line 82 of file bardecode.c.
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static |
| [in] | barstr | of widths, in set {1, 2} |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/Two-out-of-five_code (Note:
the codes given here are wrong!)
http://morovia.com/education/symbology/code25.asp
(2) This is a very low density encoding for the 10 digits.
Each digit is encoded with 5 black bars, of which 2 are wide
and 3 are narrow. No information is carried in the spaces
between the bars, which are all equal in width, represented by
a "1" in our encoding.
(3) The mapping from the sequence of five bar widths to the
digit is identical to the mapping used by the interleaved
2 of 5 code. The start code is 21211, representing two
wide bars and a narrow bar, and the interleaved "1" spaces
are explicit. The stop code is 21112. For all codes
(including start and stop), the trailing space "1" is
implicit -- there is no reason to represent it in the
Code2of5[] array.
Definition at line 372 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
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static |
| [in] | barstr | of widths, in set {1, 2} |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/Code39
http://morovia.com/education/symbology/code39.asp
(2) Each symbol has 5 black and 4 white bars.
The start and stop codes are 121121211 (the asterisk)
(3) This decoder was contributed by Roger Hyde.
Definition at line 660 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
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static |
| [in] | barstr | of widths, in set {1, 2, 3, 4} |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/Code93
http://morovia.com/education/symbology/code93.asp
(2) Each symbol has 3 black and 3 white bars.
The start and stop codes are 111141; the stop code then is
terminated with a final (1) bar.
(3) The last two codes are check codes. We are checking them
for correctness, and issuing a warning on failure. Should
probably not return any data on failure.
Definition at line 545 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
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static |
| [in] | barstr | of widths, in set {1, 2} |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/Codabar
http://morovia.com/education/symbology/codabar.asp
(2) Each symbol has 4 black and 3 white bars. They represent the
10 digits, and optionally 6 other characters. The start and
stop codes can be any of four (typically denoted A,B,C,D).
Definition at line 741 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
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static |
| [in] | barstr | of widths, in set {1, 2, 3, 4} |
| [in] | first | first digit: 0 - 9 |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/UniversalProductCode
http://morovia.com/education/symbology/ean-13.asp
(2) The encoding is essentially the same as UPC-A, except
there are 13 digits in total, of which 12 are encoded
by bars (as with UPC-A) and the 13th is a leading digit
that determines the encoding of the next 6 digits,
selecting each digit from one of two tables.
encoded in the bars (as with UPC-A). If the first digit
is 0, the encoding is identical to UPC-A.
(3) As with UPC-A, the last digit is a check digit.
(4) For now, we assume the first digit is input to this function.
Eventually, we will read it by pattern matching.
TODO: fix this for multiple tables, depending on the value of first
Definition at line 942 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
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static |
| [in] | barstr | of widths, in set {1, 2} |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/Interleaved_2_of_5
(2) This always encodes an even number of digits.
The start code is 1111; the stop code is 211.
Definition at line 450 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
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static |
| [in] | barstr | of widths, in set {1, 2, 3, 4} |
| [in] | debugflag |
Notes:
(1) Ref: http://en.wikipedia.org/wiki/UniversalProductCode
http://morovia.com/education/symbology/upc-a.asp
(2) Each symbol has 2 black and 2 white bars, and encodes a digit.
The start and stop codes are 111 and 111. There are a total of
30 black bars, encoding 12 digits in two sets of 6, with
2 black bars separating the sets.
(3) The last digit is a check digit. We check for correctness, and
issue a warning on failure. Should probably not return any
data on failure.
Definition at line 827 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
| char * barcodeDispatchDecoder | ( | char * | barstr, |
| l_int32 | format, | ||
| l_int32 | debugflag ) |
| [in] | barstr | string of integers in set {1,2,3,4} of bar widths |
| [in] | format | L_BF_ANY, L_BF_CODEI2OF5, L_BF_CODE93, ... |
| [in] | debugflag | use 1 to generate debug output |
Definition at line 97 of file bardecode.c.
References barcodeDecode2of5(), barcodeDecode39(), barcodeDecode93(), barcodeDecodeCodabar(), barcodeDecodeEan13(), barcodeDecodeI2of5(), barcodeDecodeUpca(), and barcodeFindFormat().
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static |
| [in] | barstr | of barcode widths, in set {1,2,3,4} |
Definition at line 142 of file bardecode.c.
References barcodeVerifyFormat().
Referenced by barcodeDispatchDecoder().
| l_int32 barcodeFormatIsSupported | ( | l_int32 | format | ) |
| [in] | format |
Definition at line 170 of file bardecode.c.
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static |
| [in] | barstr | of barcode widths, in set {1,2,3,4} |
| [in] | format | L_BF_CODEI2OF5, L_BF_CODE93, ... |
| [out] | pvalid | 0 if not valid, 1 and 2 if valid |
| [out] | preverse | [optional] 1 if reversed; 0 otherwise |
Notes:
(1) If valid == 1, the barcode is of the given format in the
forward order; if valid == 2, it is backwards.
(2) If the barcode needs to be reversed to read it, and &reverse
is provided, a 1 is put into reverse.
(3) Require at least 12 data bits, in addition to format identifiers.
(TODO) If the barcode has a fixed length, this should be used
explicitly, as is done for L_BF_UPCA and L_BF_EAN13.
(4) (TODO) Add to this as more formats are supported.
Definition at line 204 of file bardecode.c.
Referenced by barcodeDecode2of5(), barcodeDecode39(), barcodeDecode93(), barcodeDecodeCodabar(), barcodeDecodeEan13(), barcodeDecodeI2of5(), barcodeDecodeUpca(), and barcodeFindFormat().
1.12.0