Determining template type when accessing OpenCV Mat elements

Question

I\'m using the following code to add some noise to an image (straight out of the OpenCV reference, page 449 -- explanation of cv::Mat::begin):

void
         


        

Answer 1

They are hardcoded because performance is better that way.

In OpenCV1.x there is cvGet2D() , which can be used here since Mat can be casted as an IplImage. But it's slow since each time you access a pixel the function will find out the type, size, etc. Specially inefficient in loops.