MATLAB: How to classify normal faces and smiling faces

classificationemotion recognitionImage Processing ToolboxStatistics and Machine Learning Toolbox

how to classify normal faces and smiling faces. What Technique is involved behind this?

Best Answer

I think someone asked this earlier this summer. There are several patents covering this. Look them up and they will tell you the whole algorithm. That's what they have to do in order for their patent to be granted.
You can also try by looking around here: http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics It has sections like:
21.3.6 Facial Expressions and Emotion Analysis and Description
    21.3.6.1 Face Expression Recognition and Analysis, Facial Expression Analysis, Facial Expressions
        21.3.6.1.1 Three-Dimensional Face Expression Recognition and Analysis
        21.3.6.1.2 Face Action Units for Expressions and Motion Analysis
        21.3.6.1.3 Face Expression Recognition from a Single Image 
    21.3.6.2 Emotion Recognition from Face Images
        21.3.6.2.1 Emotion Recognition, from Other Than Faces 
    21.3.6.3 Facial Expressions, Overviews, Surveys, Data
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