How to use face detection in iphone sdk

How to use face detection for the face image using iPhone camera ?

I want to 开发者_C百科develop an application for iPhone in xcode and use face Image in the application to but I do not know how it is possible to use face detection in my application. Any ideas?

You can take a look at openCV

Here is a link to the question asking something similar to your question
iPhone and OpenCV.

And i think you can find a template from this site

http://www.ient.rwth-aachen.de/cms/software/opencv/