Using Objective-C, is there any way to compare two images and get a % difference value returned?

Question

Using Objective-C, is there any way to compare two images and get a % difference value returned?

For example, one image will have and X in it. Another image will ha

Answer 1

You can use OpenCV (Open Source Computer Vision) library in iphone.This question has a good discussion on image comparison algorithms. Image processing on the iPhone this link may be helpful.