Doesn't correctly recognize some QR

[jroblesluna]

System information (version)

• OpenCV =>4.5.5
• Operating System / Platform =>Mac/Windows
• Compiler => Python

Detailed description

Some QR files in PNG format are recognized by smartphones and algo with ZXING library, but OpenCV fails

Steps to reproduce

With attached Splitted_000.png works fine
With attached Splitted_002.png and Splitted_006.png detection fails (recognized as not rectangular QR matrix)

Issue submission checklist

• [X ] I report the issue, it's not a question
• [X ] I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found solution
• [X ] I updated to latest OpenCV version and the issue is still there
• [X ] There is reproducer code and related data files: videos, images, onnx, etc

[alexioslyrakis]

@jroblesluna Does the same happen in with a C++ version of your program? Can you post the sample code?

[liuyunfeng2016]

@jroblesluna Does the same happen in with a C++ version of your program? Can you post the sample code?

Hello,I have the same question. In python,
我使用了官方样例的二维码图片例子，但是依旧检测不出来，我用的是
opencv-contrib-python ==4.5.5.62，opencv-python == 4.5.5.62
https://raw.githubusercontent.com/opencv/opencv_extra/4.x/testdata/cv/qrcode/multiple/3_qrcodes.png
qrcode_detector = cv2.QRCodeDetector() qr_points = qrcode_detector.detect(img)
我尝试过下面一系列的检测情况，但是依旧检测不出来
decodeMulti

[AleksandrPanov]

First image (TC000) fixed by #22025

[asmorkalov]

With current 4.x (pre 4.7.0) all qr codes are detected correctly. The last one is decoded with dectAndDecodeMulti() by some reason. M.b. related: #22107

[AleksandrPanov]

This new problem, decodeMulti() and decode() work differently in QRCodeDetector

[microboym]

same problem in 4.9.0