How to compare two images with iphone sdk?

Question

suppose i have taken one picture from my iphone camera and now i want to compare this image with other images and find best match image from that.

is it possible or

Answer 1

Are you just comparing the differences between the two images or are you trying to match objects in the images with objects in other images?

If it's the latter then you may need to look into computer vision and stereo image analysis, particularly image rectification and point matching.

Computer Vision - A Modern Approach by Jean Ponce and David Forsyth is a fairly good book.

Answer 2

there is very less help available for the image processing algorithms in objectiveC, but you can go in deep with Quartz 2D and try to compare images even Image processing on the iPhone link may be helpful.

Answer 3

There is nothing built into the SDK for comparing images, but any C library for image comparison can probably be used. This question has a good discussion on image comparison algorithms.