Image recognition really is a huge task, and your question is rather vague. Image recognition is not just a simple matter of calling the ImageRecognise() function, there's an awful lot to it. Perhaps you should look into neural computing, and google for (surprisingly enough) 'image recognition'. Unless, of course, you really just want to check an icon (as you say) bit for bit, in which case the problem is simple- check each pixel of the image against what you're trying to find. If they're all the same you've got a match. Ta-da.