how to detect smile of a person ??
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how to detect the smile of the person. whats the technology involved behind this??
6 Comments
Walter Roberson
on 22 Aug 2012
Siva, the discussion here references previous discussion; see http://www.mathworks.co.uk/matlabcentral/answers/39545#answer_49322
Accepted Answer
Babak
on 22 Aug 2012
First you got to detect the line between the lips. After that you need to compute the arc angle of that line if it is caved towards up or down making the person look sad or happy. To detect a line in an image you can see the DEMO that involves finding the lines of the street's cars' lanes.
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Image Analyst
on 22 Aug 2012
Since these are patented methods, they will be explained in the patents. That's the agreement in a patent: you get exclusive right to use it for 20 years, but the public gets to know how it's done (no secrets anymore). Have you searched the patent database: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=0&f=S&l=50&d=PTXT&RS=smile&Refine=Refine+Search&Refine=Refine+Search&Query=smile+AND+camera
For just one example, US Patent 8170298: Method for detecting facial expression and repairing smile face of portrait photo
It's probably already in digital cameras. If not yet, then it will be soon.
3 Comments
Walter Roberson
on 22 Aug 2012
It is in the Nikon Coolpix series of cameras for the last 2 or so years. (I have one that has the feature.)
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