imshow() producing weird results with OpenCV 3.2 in C++

Question

I am taking in RGB data from my Kinect and trying to put it into an OpenCV matrix. The data is held in "src":

Mat matrixImageRGBA(w, h, CV_8UC4);
memcpy(matrixImageRGBA.data, src, sizeof(byte) * w * h * 4);

However, when I use "imshow" to see the image, it is tiled four time horizontally. I am using the following command:

imshow("Window", matrixImageRGBA);
waitKey(500);

Does anyone have any idea of what the problem may be here? It's driving me nuts.

Thanks!

Answer 1

You have w and h backwards. According to the docs the constructor takes the height as the first argument:

Mat (int rows, int cols, int type)      

Also, I would recommend using this constructor:

Mat(int rows, int cols, int type, void *data, size_t step=AUTO_STEP)

instead of copying to the data field (since you are using no padding at the end of each row use the default AUTO_STEP for step ).