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From: Armin Susa on 6 Jun 2010 07:16
Hi people, I have project where I need to detect smile on the figure. My plan is; first to detect face and than smile. I know how to detect face (I have code) but I do not know how to detect smile?
From: Syed Umair Uddin on 6 Jun 2010 07:50
"Armin Susa" <armin.susa(a)gmail.com> wrote in message <hug01j$qm7$1(a)fred.mathworks.com>...
> Hi people, I have project where I need to detect smile on the figure. My plan is; first to detect face and than smile. I know how to detect face (I have code) but I do not know how to detect smile?

Hi Armin,

First, its a Face expression detection problem,its a good idea if you use integrated OpenCV library on the Matlab platform to solve the issue. I recommend you to start from viola and jones method and Multiclass SVM .
FaceSDK is another good option as TK.

For the Gesture Recognition , Three steps to go , as Image preprocessing steps

1)Histogram Equilization
2)Edge Detection
3)Token Finding

Best of Luck
Umair Uddin
From: ImageAnalyst on 6 Jun 2010 09:55
I'm sure there are several patents on detecting smiles. In fact one
was granted less than a month ago:

United States Patent 7,715,598
Li , et al. May 11, 2010
Method for detecting facial expressions of a portrait photo by an
image capturing electronic device

And there's this one:
U.S. Pat. No. 6,301,440 discloses adjusting image capture parameters
based on analysis of temporary images, and awaiting taking a picture
until everyone in the temporary images is smiling.

I'm sure there are others. (e.g. 7,440,621:"Attractive facial image
determining system" (Microsoft), etc.) The digital camera and
digital imaging industry is heavy into research on faces, for obvious
reasons.
You might start by reading these and following up on references and
citations in the patents, or just by doing a web search in general.
For example, you can start here:

http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics
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