how to detect eye and lip movements by comparing two images of a person

plz can any one help me know how to detect eye and lip movement by comparing two image of a person..

i m doing a project on patient monitoring system for detecting patient's eye and lip movements...so plz some help me or guide me how to solve this problem .

[Mehran]

working on the similar type of system here in pakistan , mahendra thing is i guess you should work from the basics , and do share with me if you find some relevent material [e-mail]

Answer 1

[Image Analyst]

For starters, why don't you just try subtracting the images? You can get fancier by trying to find the faces in the image and then further narrow down the ROI to only where the eyes and lips are.

[mahendra kumar]

thank you so much for answering my question:-)..

i m very new to this matlab , can u plz suggest me which

algorithm r technique to be used for face detection and to detect eyes n lips...plzzzzzzz

[Image Analyst]

diffImage = image1 - image2;

Also, the new Computer Vision Toolbox for R2012a has face recognition built in. If I were you, I'd take advantage of all the work they put into that so that you don't waste too much time reinventing it.

[mahendra kumar]

sir i hav some how managed to detect the face,,,now i hav a new problem that is while comparing two image by subtract is taking even a lighting change as difference.... so can plz suggest me any technique to avoid this problem while comparing the image...

[Image Analyst]

Yes, that's right. It can be a very complicated problem. Check out how other people have done it here: http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics