datamatrix detection problem

[eda toper]

Hello,

 I have a problem with scanning datamatrix. If i want to read the datamatrix, The data matrix should be in the middle of the image or I need to crop an area that the datamatrix is in from the image.

I just use zxing library. Is this a general problem?  Can you give me some advice about the problem?

I could never make it read without cropping the Datamatrix code like in the picture below.

Can you help me with this?

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Eda Derya Toper

[Sean Owen]

Ideally crop to the region you know contains the barcode, to improve performance. It might find it from this image.

However, that Datamatrix code looks messed up, like it was encoded incorrectly or without a mask.

[eda toper]

I have a general problem about datamatrix.  I have no problem with other barcodes (1d or qrcode) .

I only use the Zxing.net library. 

Other datamatrix images that cannot be decoded are as follows.  

I used these parameters as below👇   Am I missing something?

Options = new DecodingOptions
                {
                    TryHarder = true,
                    PureBarcode = false,                    
                    PossibleFormats = new List<BarcodeFormat> { BarcodeFormat.QR_CODE,                   
                    BarcodeFormat.CODE_39,
                    BarcodeFormat.CODE_93,
                    BarcodeFormat.CODE_128,
                    BarcodeFormat.CODABAR,                    
                    BarcodeFormat.PDF_417,                 
                    BarcodeFormat.DATA_MATRIX,
                    BarcodeFormat.MAXICODE,
                    }

ZXing.Result[] results = reader.DecodeMultiple(imgread.Bitmap);

Sean Owen <sro...@gmail.com>, 4 Ağu 2022 Per, 17:18 tarihinde şunu yazdı:

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Eda Derya Toper

[Lachezar Dobrev]

  The Data Matrix locator is a bit simplistic. The locator will *only* find matrices that are in the middle of the image. There also needs to be a significant white space around the matrix for it to be identified.

  This only applies to Data Matrices.

To view this discussion on the web visit https://groups.google.com/d/msgid/zxing/CAMNH7H%3Dere4xexHL2CjhPZNz0jFsQszm4G8e5LyMTMae6q1uaw%40mail.gmail.com.

[Farman Ali]

Working on a web application which needs to scan the QR code from the device camera. In iOS its not possible to open the camera to scan the image. The alternative was was to upload a picture taken from the camera of the QR Code.

But the issue is the libraries which we are using to decrypt the QR code, does not recoganise the image uploaded since it has other information surrounding the QR code too. Just taking the image of QR code is not possible.

Is there a way where we can crop just the QR code part of the image ? or any library that can decrypt the QR code despite all other information in the image

[eda toper]

I didn't have a problem decoding QRCode with the Zxing library. 

I created a desktop app with C#. And I can decode 1d and QRcode on the image and webcam. 

I had some problems with Datamatrix and sometimes PDF417.

Thank you everyone for your valuable information and advice. 

Farman Ali <farman...@gmail.com>, 5 Ağu 2022 Cum, 14:56 tarihinde şunu yazdı:

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Eda Derya Toper