Maybe your time is not correct

[celerychen]

Hi, I found that your test code is clock()/10e3, I think this is a bug, maybe is clock()/1e3, so the time maybe is 260ms?

[AlphaQi]

Thank you for your problem, but I think your conclusion is wrong, if 260ms per image, the image window will update 3.8 frame per second, that's impossible, you can use waitKey(260) with no face detect , and compare with my program.

[AlphaQi]

Hi, thanks again for your problem, I found there is something wrong in my code , I retest my program under windows, the result shows about 68ms per image, I' ll change the README file.