Some days before I was reading how to compare two JPEG images without decompressing them to the raw format and I wonder if I can do that precisely without decompressing. But what I think is that probably I can do that if I compromise with the precision. That is, in that case I wont be comparing images pixel by pixel but by 8*8 blocks by blocks of each of the channel. So my precision decrease from pixel to the block. Now as each of these block is of just 64 pixel, my precision will be of 64 pixel, rather than of 1 pixel. I think it should be pretty good if I just want to compare 2 similar images and crop the area that is different.
Well need to confirm whether it really works :) . Hope it will.
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