HI,
i can not find, method witch  can comare different size pictures.
For example I have one image "full" (100x100 pixels) and another image only part of first image (30X30 pixels).I need to determine if second piscture is part of first picture or not.
Can someone help, what algorithm i should use?

Hi is there any logic? you can compare name, size, pixel... how you are going to check? i think iys not possible...

maybe you did not understand what i need.

let's assume that i have picture of a "cat" and i have second smaller picture cropped out of first picture "cat head". and I what to know if it is the same head from first picture.

This one sounds intresting never worked on such stuff,

may be i ll try myself and then let you if it is possible at all

thanks,
Lisa 

renven:

maybe you did not understand what i need.

let's assume that i have picture of a "cat" and i have second smaller picture cropped out of first picture "cat head". and I what to know if it is the same head from first picture.

it would be difficult to do, but not impossible i believe...

i ll give it a try too...

thanks, I am waiting for your response