Find centroid of an image?

I want to find the centroid of an image mainly the face. The centroid should be on the nose of the face but I am not able to find it. Please help. Thanks in advance.

[Image Analyst]

Can you attach the image again - I accidentally deleted it when I tried to click on it's name. Very sorry about that. Randy - can you make it pop up a confirmation before deleting an attachment so this doesn't happen again (this is now the second time I've accidentally done that)?

[Dhrubajyoti Das]

I have attached the image.

Answer 1

[Image Analyst]

See my image segmentation tutorial http://www.mathworks.com/matlabcentral/answers/contributors/1343420-image-analyst/answers

[Image Analyst]

See attached file test.m below. It finds the centroid of the head in your image. Of course you know that the nose is not always guaranteed to under the centroid of the image don't you? Just think about it. Go here if you want to know how to robustly find features on a face: http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics

[Dhrubajyoti Das]

Sir, actually I am trying to implement a journal paper and the image is a thermal image. In a thermal image lower pixel value corresponds to lower thermal image. Can you please help me out.

[Image Analyst]

The code I gave does 90% of that. What follows, and is clipped off, is what I said about that centroid not always being on the nose. I don't know what they plan on doing in that case because it's clipped off.

[Dhrubajyoti Das]

I am uploading the full journal paper. From the paper, i just want to find the centroid part only. But i am not able to implement the formula for centroid from that paper (Face Localisation, 2.1). Sir, can an you please take a look. Thanks in advance.

[Image Analyst]

Sorry but I doubt I'll have time for that.

FAQ

[Dhrubajyoti Das]

Anyway sir thank you very much for your time. I have found that your's one is more efficient to work with in MATLAB.

Answer 2

[komal]

Sir please tell me how to find the centroid of the skin region in an image

[Image Analyst]

Try the color thresholder app on the Apps tab of the tool ribbon. Export the function then apply it to your image. Take the resulting binary image and pass it to regionprops() like I did in my tuorial.