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How to remove shadow from scanned documents using OpenCV?

asked 2017-06-25 21:02:43 -0500

liuzhiyuan1225 gravatar image

updated 2020-11-02 11:34:09 -0500

I'd like to remove shadow before image binarization using OpenCV. I've tried Otsu Method and adaptive thresholding, however for images where there are large regions of shadow, these two methods will not give good results.

Any better solutions? Thanks in advance.

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answered 2017-06-26 10:28:41 -0500

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Mat temp1;
Mat temp2;
Mat mask;
Mat dst;
threshold(src,temp1,50,255,THRESH_OTSU);
threshold(src,temp2,50,255,THRESH_BINARY);
bitwise_not(temp1,mask);
temp2.copyTo(dst,mask);
temp1.copyTo(dst,temp2);
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Asked: 2017-06-25 21:02:43 -0500

Seen: 920 times

Last updated: Jun 26 '17