How to remove shadow from scanned documents using OpenCV?

asked 2017-06-25 21:02:43 -0600

updated 2020-11-02 11:34:09 -0600

6772 ●3 ●48 ●79 https://github.com/stu...

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 -0600

jsxyhelu

199 ●5 ●10 http://jsxyhelu.cnblog...

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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);