I have a char* buffer I read from disk. I point a cvMat header at it to create a single channel greyscale image. I also have a single channel cvMat that is the alpha channel of the first Mat. I would like to debayer it to a preallocated 4 channel cvMat in the most runtime efficient way possible.

I’m stuck with OpenCV image read function because somehow he can’t read an image. Yes the path is correct and the image exist. I watched some tutorial on Youtube to display an image to find the problem without success. I also try to debug to check if my path was wrong but it seem to work perfectly fine so i’m kinda lost. enter image description here

I want to detect the pool balls when they are not moving. While moving I can detect them with any background subtraction model, finding a hard time detecting them while stationary.

I am trying to detect if an emoji is happy or sad using OpenCV and C++ based on the mouth contour. For now all i get is “Indeterminate” and i am not sure what to do and how to approach this problem. How can i find a way to select which contour is the mouth?

when I write this code :