how to select the parts in image that match the image i have in my database?

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i select certain part of an image and i its features in data base and then i use different images so i want to find out if features are in them or not

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Image Analyst
Image Analyst 2013-1-8
What do you mean by features? Do you mean that your "certain part of an image ... in data base" is contained as a sub-image in the "different images"? If so, you can use normxcorr2 (let me know if you want a demo). Otherwise you just have to compare feature vectors and you can do a weighted sum of differences. Or maybe you mean CBIR, like "show me all beach scenes" or "Show me photos of babies" or something like that.
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Isee You
Isee You 2013-1-9
thanks a lot "Image Analyst" and i will search for it on web
Thank you for your interest.

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