How to compare pixel values of two different grayscale images...

I have two different grayscale images both of much different sizes. One is 46x20 pixels and the other is 2592x1944 pixels. I'm having trouble finding a way to "scan" the smaller image through the larger one so that comparisons between the pixel values can be made. Basically I'm trying to see if anything matches the smaller image in the big image semi-closely. I can access the pixel values of each image but I can't figure out an algorithm to perform the scan. Any help at all would be very much appreciated! Thanks.

Hi
recipe:
1.
Find all the values for all the pixels in the small image. Some might be similar. Put all those values that are useful into a List called comparisonList.
2.
For each scanline in the large image
For each pixel in the scanline
is this pixel the same value as a pixel in the comparisonList?
if so do something
is the scanline finished?
if not next pixel
loop to next scanline
where scanline is a horizontal line in the big picture.
my 2c
hope helps

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