VB code to sample the RGB values in a image and put them into an array.(repost)

I need some vb.net 2010 code to sample pixels on a VB form and put the values in a two dimensional array in real time. The scan will automatically restart after completing and return a value to a label with the scan speed. So: (1) Images are loaded to the form (this will be used to sample video) (2) Pixel x=1,y=1 is sampled and values put into an array scan(x,y) in position [scan(1,1)] (3) Pixel x=2,y=1 is sampled and values put into an array scan(x,y) in position [scan(2,1)] etc until the whole image is scanned. To speed up scanning I need to be able to skip n pixels for x and y set from a variable.