Performing Filter in a specific part of the image

asked 2017-06-06 07:38:53 -0600

arqam
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updated 2017-06-07 00:40:57 -0600

berak
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The defined method for filters example binary filter takes two parameters, the source image MAT and destination image MAT and performs filter on the full image.

But what if I want to perform operations like filter in only a part of the image for which we have the contour points (either Point or MatOfPoint).

The solution that I am looking for is in JAVA.

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answered 2017-06-07 00:38:23 -0600

berak
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updated 2017-06-07 00:40:18 -0600

if you have a Rect, e.g. from Imgproc.boundingBox() you can can use submat:

Mat roi = image.submat(rect);

operations, which don't change the depth or type of the image, can be done in-place:

Imgproc.equalizeHist(roi,roi);

else you need a new Mat for the output:

Mat gray = new Mat();
Imgproc.cvtColor(roi, gray, COLOR_BGR2GRAY);

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Asked: 2017-06-06 07:38:53 -0600

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Last updated: Jun 07 '17

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Performing Filter in a specific part of the image