System Information

OpenCV version : 4.7.0
Operating System : Arch Linux
Compiler & compiler version: GCC 12.2.0

Detailed description

While generating QR codes with Structured Append mode (encodeStructuredAppend()) it loses some data.

e.g. while the input data is : Some text to test, more or less big, i tried differents things

We get 3 QR codes with data:

• Part 1 : Some text to test, m
• Part 2 : ore or less big, i t
• Part 3 : ried differents thin

Steps to reproduce

Sample code:

int main()
{
    std::string input_info = "Some text to test, more or less big, i tried differents things";
    cv::QRCodeEncoder::Params params;
    params.structure_number = 3;
    params.mode = cv::QRCodeEncoder::EncodeMode::MODE_STRUCTURED_APPEND;

    cv::Ptr<cv::QRCodeEncoder> encoder = cv::QRCodeEncoder::create(params);

    std::vector<cv::Mat> qrcodes;

    encoder->encodeStructuredAppend(input_info, qrcodes);
    
    for (size_t k = 0; k < qrcodes.size(); k++)
    {
        cv::Mat qrcode = qrcodes[k];
        std::string sav = std::to_string(k) + ".jpg";
        cv::imwrite(sav, qrcode);
        std::cout<<"Path :"<<sav<<std::endl;
    }
}

Issue submission checklist

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