How does auto focus in cameras work?

Question

I am just wondering how does camera auto focus work. What kind of processing does it do on images in order to adjust the focus? Is there freely available code that detects the focus level of an image or video?

See this: http://dsp.stackexchange.com/questions/2304/auto-focus-estimation/2305#2305 — pichenettes, Jun 18 '12 at 20:15
This seems like a trivial question that you could have googled or asked reddit. — CyberMen, Jun 19 '12 at 12:47

score 2 · Answer 1 · edited May 23 '17 at 12:41

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This answer actually provides free code to perform the focus detection. https://stackoverflow.com/a/3795151/600736

edited May 23 '17 at 12:41

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answered Sep 07 '12 at 14:15

d4v3y0rk

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How does auto focus in cameras work?

1 Answers1