seiferteric
commented
1 year ago Here is another example using the inspect tool. It looks like the corner detection has some issue in that the first one looks fine with top left, top right, bottom right, bottom left, but then the others seem like something went wrong. Maybe the second one thinks it's rotated? But the last one there are negative numbers in the corners which I don't understand, but maybe it allows negative index if it is partially out of frame?
3 QR-codes found:
45 cells, corners: (4,4) (48,4) (48,48) (4,48)
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Decoding successful:
Version: 7
ECC level: L
Mask: 0
Data type: 4 (BYTE)
Length: 144
Payload: *Cm>6�;�]&���3��x�Y;��If�{aB��l����,
�+�M��N0+�lv�xd0٦�Z�I���!E�;p��((�YS~�e�z�X���h�Y͍rp�� �'�qP�H�C�n����;�K ��~^-�~�F�E5��x�
49 cells, corners: (49,4) (49,46) (5,38) (5,4)
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Decoding FAILED: ECC failure
33 cells, corners: (4,47) (4,-10) (39,-17) (26,46)
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Decoding FAILED: Format data ECC failure
Hello, I was generating random qr codes in 8-bit data mode with between 1-200 bytes in length and then detecting them with quirc. I am passing the generated image data directly into quirc input, so not cameras involved, just clean bitmap data. Sometimes it will detect more than one (according to quirc_count) when there should always be only one code seen.
I am wondering if this is an issue with detection, or a limitation of qr code spec itself, if in some circumstances, you could have what appears to be a qr code inside of a qr code depending on the data?
Here is an example, it claims to detect 3 codes here:
I can provide my test code if needed.