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OpenCV (Java): how to access coordinates returned by findNonZero()?

asked 2013-08-10 00:50:18 -0500

Mahm00d gravatar image

updated 2013-08-12 09:22:41 -0500

In my android app, I am using findNonZero() to find and access white points in a binary image.

I get the image (called binMat with size: 595*800) as the input to the method and then I have:

...
Mat wLocMat = Mat.zeros(binMat.size(), binMat.channels()); 
Core.findNonZero(binMat, wLocMat);

The problem is: I don't know how to access the white points' coordinates stored inside the wLocMat!

When I log the wLocMat.toString(), I get this:

[ 476000*1*CV_32SC2, isCont=true, isSubmat=false, nativeObj=0x74abd920, dataAddr=0x75bac010 ]

So, how exactly can I access the coordinates stored in wLocMat?!

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answered 2013-08-12 14:29:56 -0500

Andrey Pavlenko gravatar image

The returned Mat is of N*1 size (where N is a number of non-zero elements of input Mat) and each of its elements contains row & col of non-zero element of input Mat. Consider it as an array non-zero pixels indexes.

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Asked: 2013-08-10 00:50:18 -0500

Seen: 4,256 times

Last updated: Aug 12 '13