Generate the dataMAtrix with a forced c40 encoding
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Elyes Bezzine
Nov 29, 2021, 3:37:35 AM11/29/21
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Hello, are there plans to generate the DataMatrix with a forced C40 encoding ?
Why not add a parameter that allows you to choose the exclusive encoding type in the DataMatrixWriter and encodeHighLevel class ?
Thanks
Why not add a parameter that allows you to choose the exclusive encoding type in the DataMatrixWriter and encodeHighLevel class ?
Thanks
Elyes Bezzine
Dec 8, 2021, 3:40:43 AM12/8/21
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Hello,
I have created an attached Git patch (DataMatrixZxingForceC40.patch) which allows to force the encoding in C40. I couldn't create a pull request on github, that's why I'm putting a patch here, it can still be useful to someone.
I also added the zip of the core project which embeds the modifications.
I have created an attached Git patch (DataMatrixZxingForceC40.patch) which allows to force the encoding in C40. I couldn't create a pull request on github, that's why I'm putting a patch here, it can still be useful to someone.
I also added the zip of the core project which embeds the modifications.
Elyes Bezzine
Dec 8, 2021, 3:44:40 AM12/8/21
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How to use it:
...
...
final DataMatrixWriter barcode = new DataMatrixWriter();
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
hints.put(EncodeHintType.DM_ENCODING_TO_FORCE, HighLevelEncoder.C40_ENCODATION);
final BitMatrix bitMatrix = barcode.encode(this.dmTextToEncode, DATA_MATRIX, this.size, this.size, hints);
...
Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
hints.put(EncodeHintType.DM_ENCODING_TO_FORCE, HighLevelEncoder.C40_ENCODATION);
final BitMatrix bitMatrix = barcode.encode(this.dmTextToEncode, DATA_MATRIX, this.size, this.size, hints);
...
...
Alex Geller
Dec 8, 2021, 3:55:57 AM12/8/21
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Hi,
I am guessing that you want to force C40 encoding to get a smaller size. Can you confirm? If yes, wouldn't the fix be rather to improve the algorithm that finds the most compact representation? Can you give a sample string that it not encoded as compact as it could be?
Elyes Bezzine
Dec 8, 2021, 4:42:22 AM12/8/21
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Hello,
No, I want to force the encoding in C40 to respect the specifications imposed by the French government for health documents, the DataMatrix is rejected if the encoding is not in C40.
Here is the DataMatrix validation link: https://interop.esante.gouv.fr/datamatrixins-1.0-SNAPSHOT/
Example of input string: IS010000000000000000000000S1118058599124123S21.2.250.1.213.1.4.8 S3FIRST NAMETEST S5MS618-06-1985S713201S4LASTNAMETEST
No, I want to force the encoding in C40 to respect the specifications imposed by the French government for health documents, the DataMatrix is rejected if the encoding is not in C40.
Here is the DataMatrix validation link: https://interop.esante.gouv.fr/datamatrixins-1.0-SNAPSHOT/
Example of input string: IS010000000000000000000000S1118058599124123S21.2.250.1.213.1.4.8 S3FIRST NAMETEST S5MS618-06-1985S713201S4LASTNAMETEST
The specifications (In French): https://esante.gouv.fr/sites/default/files/media_entity/documents/ans---datamatrix-ins-concertation.pdf
Elyes Bezzine
Dec 8, 2021, 4:48:39 AM12/8/21
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The specifications (In French) last version : https://esante.gouv.fr/sites/default/files/media_entity/documents/ans---datamatrix-ins-v2.pdf
Message has been deleted
Elyes Bezzine
Dec 8, 2021, 4:57:18 AM12/8/21
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Most paid libraries offer the forced encoding mode in C40,
Unfortunatly Zxing doesn't.
Alex Geller
Dec 8, 2021, 5:11:21 AM12/8/21
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I see, thanks for clarifying.
It can be encoded in 80 bytes as follows: ASCII(IS010000000000000000000000S1118058599124123S21), EDF(.2.250.1.213.1.4.8 S3FIRST NAMETEST S5MS618-06-), ASCII(1985S713201S4), X12(LASTNAMETEST).
Note the large ASCII encoding parts which encodes every digit in 4 bits instead of the 5,33 bits of C40. The combination of dots and digits can be encoded in EDIFACT by 6 bits per character where C40 takes 10.66 bytes for every dot character.
Strange that the French government forces inefficient encoding.
Thanks again for clarifying and giving the reference. If the issue had been related to an algorithmic problem of the minimal encoding then I could have possibly been of help.
Note the large ASCII encoding parts which encodes every digit in 4 bits instead of the 5,33 bits of C40. The combination of dots and digits can be encoded in EDIFACT by 6 bits per character where C40 takes 10.66 bytes for every dot character.
Strange that the French government forces inefficient encoding.
Thanks again for clarifying and giving the reference. If the issue had been related to an algorithmic problem of the minimal encoding then I could have possibly been of help.
Best regards,
Alex
Elyes Bezzine
Dec 8, 2021, 5:29:30 AM12/8/21
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I agree that the choice of the forced C40 is weird, best regards
Alex Geller
Dec 8, 2021, 8:06:39 AM12/8/21
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Not relevant for your request, I just share the information because I was curious to quantify the difference of C40 vs. minimal encoding in this example. I takes 10% more bytes to encode (88 bytes instead of 80) and the surface increases by 20% (40 x 40 instead of 36 x 36).
Elyes Bezzine
Dec 8, 2021, 8:17:32 AM12/8/21
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thank you for your feedback
Alex Geller
Jan 27, 2022, 3:10:30 AM1/27/22
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FYI, upcoming version 3.5.0 includes EncodeHintType.FORCE_C40 that forces C40 encodation.
Regards,
Alex
Elyes Bezzine
Jan 27, 2022, 3:41:31 AM1/27/22
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great news, thanks
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