![python - When getting an ROI from a numpy array (opencv image) why does img[y0:y1, x0:x1] seem to use an inconsistent range of indicies? - Stack Overflow python - When getting an ROI from a numpy array (opencv image) why does img[y0:y1, x0:x1] seem to use an inconsistent range of indicies? - Stack Overflow](https://i.stack.imgur.com/t307l.png)
python - When getting an ROI from a numpy array (opencv image) why does img[y0:y1, x0:x1] seem to use an inconsistent range of indicies? - Stack Overflow
How to convert numpy array(python) to a cv::Mat(c++)? · Issue #15 · renatoGarcia/opencv-swig · GitHub
![Drawing into a numpy view with a negative step in the channel dimension doesn't work · Issue #15895 · opencv/opencv · GitHub Drawing into a numpy view with a negative step in the channel dimension doesn't work · Issue #15895 · opencv/opencv · GitHub](https://user-images.githubusercontent.com/730130/68665520-7a88fd80-0542-11ea-8cab-531c56921bc8.png)