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Is it possible for calcHist to return a hist with NaN

asked 2013-07-20 13:03:34 -0500

zhihua gravatar image

updated 2013-07-20 20:21:41 -0500

Hi, everyone

I am currently using calcHist function to do some feature extraction processing. But I encounter a problem that the hist which is returned by calcHist may contains NaN value. I'm wondering if this situation is normal for calcHist function? And why this happens?


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could you (edit and) show some code ?

berak gravatar imageberak ( 2013-07-21 10:18:39 -0500 )edit

I have the same problem when I try to calculate a histogram over an image with only one color (e.g. a matrix full of CV_RGB(0,0,250)'s). I do this many times and in random instances the output histogram is full of NaN values.

jorjazo gravatar imagejorjazo ( 2013-10-31 13:30:19 -0500 )edit

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answered 2017-06-17 19:47:40 -0500

waschbaer gravatar image

I don't get NaN, even the matrix includes many NaN, it seems like it will ignore NaN as a single bin. Unless, the whole matrix contains only NaN, in that case, I don't know what will happen.

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Asked: 2013-07-20 13:03:34 -0500

Seen: 375 times

Last updated: Jun 17 '17