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Method in opencv for percentile similarity of two faces?

asked 2017-12-11 01:49:27 -0500

zzywd01 gravatar image

Hi guys, is there any method in openCV to get the similarity score in percentage of two faces? I know that SIFT is super to solve this case, but I cannot find any good way to get the percentile result. Could anyone give me some hints? I'm a Java user, but any other language are welcome :)

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if you only have 2 images, this is called verification . have a look here

berak gravatar imageberak ( 2017-12-11 01:53:26 -0500 )edit

@berak Thanks for the reply. In fact, I want to compare one test sample with the whole data base, and get the result with the highest percentage.

zzywd01 gravatar imagezzywd01 ( 2017-12-11 02:04:22 -0500 )edit

did u find any solution if yes so kindly share with me i am doing same this project on java/android

vickyrajpoot gravatar imagevickyrajpoot ( 2018-04-09 06:13:00 -0500 )edit

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answered 2017-12-11 06:11:11 -0500

@zzywd01, so you need to find

  • distance between your sample and all database samples
  • find the largest distance (worst match)
  • normalize the range [0, largest distance] towards [100%, 0%]

In principle this will always depending on the dataset used, but thats quite normal in my opinion.

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And even in my opinion, you could start from [smallest distance, largest distance], because 0 will only be obtained by the exact same image.

StevenPuttemans gravatar imageStevenPuttemans ( 2017-12-11 06:12:44 -0500 )edit

Thank you steven. Is this similar to the value "confidence" which can be obtained from faceRecognizer.predict(test sample, predLabel, Confidence)? It seems that I should normalize the confidence to get the percentage.

zzywd01 gravatar imagezzywd01 ( 2017-12-11 09:28:50 -0500 )edit

Yep thats exactly that I think!

StevenPuttemans gravatar imageStevenPuttemans ( 2017-12-12 08:15:45 -0500 )edit

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Asked: 2017-12-11 01:49:27 -0500

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Last updated: Dec 11 '17