Pixel coordinates opencv, c++

I need to know how to extract all pixels locations for the frame and put them in a matrix in order to make some operations on them. 2D frames, so it will be (x,y) coordinates.

I Have obtained a rotation matrix and translation matrices of features between 2 frames in captured vid开发者_StackOverflow社区eo, now I wanna use these matrices to multiply it by the image in order to correct the video frames

I prefer to use opencv functions.

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If I understand correctly, you want to apply the transformation to the whole image to create a warped image. There is no need to do this on a pixel list.
You should use cvWarpAffine() with your matrix to get the warped image.

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Efficient direct pixel access in openCV http://opencv.willowgarage.com/wiki/faq#Howtoaccessimagepixels