Matlab gradient equivalent in opencv

Question

I am trying to migrate some code from Matlab to Opencv and need an exact replica of the gradient function. I have tried the cv::Sobel function but for some reason the values

Answer 1

You have to call Sobel 2 times, with arguments:

xorder = 1, yorder = 0

and

xorder = 0, yorder = 1

You have to select the appropriate kernel size.

See documentation

It might still be that the MatLab implementation was different, ideally you should retrieve which kernel was used there...

Edit:

If you need to specify your own kernel, you can use the more generic filter2D. Your destination depth will be CV_16S (16bit signed).