Radon Transform

[GerhardZangerl]

System Information

openCV version 4.9.0-dev
Ubuntu 22.04.4 LTS

Detailed description

The Radon Transform provided by openCV changes its src contrary to its documentation. I fixed that behavior locally by changing:

Mat _srcMat = src.getMat() ---> Mat _srcMat = src.getMat().clone();

in the "radon_transform.cc" file.

Steps to reproduce

After the call

double thetastep = 1.0
double  startAngle = -20;
double endAngle = 20;
cv::ximgproc::RadonTransform(matRef, radMatRef, thetaStep, startAngle, endAngle, true);

the cv::Mat matRef seess to be chagen. More detailed: I was using the Radon Transform within a loop when i recognized the behavior.

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)