Hello can anyone solve this face detection question?

Question

asthana 2014-6-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/134140-hello-can-anyone-solve-this-face-detection-question

评论： Image Analyst 2014-6-14

helllo every one please tell me why we use Y=255.0*(Y-minY)./(maxY-minY); and why we convert the image in to ycbcr model in the code given over this

link http://www.mathworks.in/matlabcentral/fileexchange/23382-simple-face-detection/content/detect_face.m

and in the result we didn't get the number of face

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Geoff Hayes 2014-6-13

You may want to re-read the header comments in that file and check out the paper that it references ("A simple and accurate face detection algorithm in complex background").

Stepping through the code at these particular lines may also reveal why these actions are happening and their effects on the image.

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Answer 1

Image Analyst 2014-6-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/134140-hello-can-anyone-solve-this-face-detection-question#answer_140779

在 MATLAB Online 中打开

A key clue is the author's comment in his code:

% Notes: This algorithm is very primitive and doesn't work in real life.

The code basically depends on hard coded thresholds that probably worked okay for the images that the author had on hand, but might not work well for your image(s).