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what's the meaning of '>' with Mat

asked 2013-12-06 03:19:07 -0500

wscem gravatar image

updated 2017-09-03 06:31:54 -0500

{//code=c++

    Mat m = imread("flow.jpg");
    m = m > 50;
}

what's the mean of '>'?

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answered 2013-12-06 03:50:55 -0500

berak gravatar image

updated 2013-12-06 03:53:29 -0500

it's a shortcut for 'threshold'

// result: binary Mat , where any pixel in the original > 50 is set to 255 (on),
//  all others to 0 (off)
m = m > 50;   

// same as:
threshold(m,m,50,255,0);

cv::Mat has a lot of 'overloaded' operators, so you can write equations like:

Mat v = a * x + b;
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Comments

4

The overloaded operators are good for prototyping, but do remember the temporary objects generated by those operator. Although expression template can eliminate those temporary objects but opencv do not implement them by expression template.

stereomatching gravatar imagestereomatching ( 2013-12-06 21:52:37 -0500 )edit

@berak as i know '>' use compare() but i did not check it.

sturkmen gravatar imagesturkmen ( 2017-09-03 08:57:03 -0500 )edit
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Asked: 2013-12-06 03:19:07 -0500

Seen: 204 times

Last updated: Sep 03 '17