OpenCV: Convert Mat to 3D Image Array

Question

I am capturing frames from a video source and want to output them as files in, for example, BMP format.

What I would like to know is a) is there built in functionality for this, and b) if not, how do I get the RGB values for each of the pixels in each frame represented by a Mat object?

Thanks in advance for your help.

Answer 1

a) See imwrite (on the same page of the documentation as the video capture stuff)

b) If you do want to get RGB values from a Mat object, see the Mat documentation , which discusses element access in detail - in summary, M.at<datatype>(i,j) or M.data[ M.step[0]*i + M.step[1]*j ] -- the latter may differ depending on your version of OpenCV, consult the corresponding documentation page.