OpenCV - Java : inRange function

Question

I have my image mRgba and when I do this :

Core.inRange(mRgba, B1, B2, mRgba);

I have the result that I expect : all my RGBA image is thresholded between B1 and B2.

Now I want to do this :

Mat roi = mRgba.submat(rect);
Core.inRange(roi, B1, B2, roi);

And it's not apply on my area rectangle, I try everything since 3 hours I can't find a solution...

I accept C++ code or anything, just an explanation...

Bidonjour
– Bidonjour

2015-02-17 22:11:35 +00:00
Commented Feb 17, 2015 at 22:11 — Bidonjour
– Bidonjour, Commented Feb 17, 2015 at 22:11

Bidonjour · Accepted Answer · 2015-02-18 09:38:08Z

12

OK, maybe everybody doesn't care, but after many tries, i found the answer.

Mat roi = new Mat();
roi = mRgba.submat(rect);
Mat roiTmp = roi.clone();

Imgproc.cvtColor(roiTmp, roiTmp, Imgproc.COLOR_RGB2HSV);

Core.inRange(roiTmp, B1, B2, roiTmp);

Imgproc.cvtColor(roiTmp, roi, Imgproc.COLOR_GRAY2BGRA);

answered Feb 18, 2015 at 9:38

Bidonjour

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