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Compare A Picture With Another Picture

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I have a quite complex problem, i would like to scan a big picture after a smaller one. For example, i got image1.jpg that contains the text "Hello". I got a bigger picture which contain a whole message and I want to scan the bigger picture to see if I can find the smaller one. The problem is that it is a picture, if it would have been plain text i could easily search it but now its a image. Maybe i have to do a pixel-by-pixel search but im not sure, and if so.. i need some guidelines thanks.

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