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Apply a function to every Mat element

asked 2013-04-09 13:15:27 -0500

rhuang gravatar image

Hello, I am looking for a method to apply a function to every single element of an input matrix. I've looked at remap() and transform(), but they both take a transformation matrix. What I am looking for is the equivalent of the map() function in Python.

PS I understand I can iterate through and apply the function to each of the the elements in my input matrix, but I am hoping CV has something built in because that might have been optimized.

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answered 2013-04-09 13:41:27 -0500

Basically, the looping is the only thing that can be applied to access each element seperately and perform a function to it. This is because the Mat element is actually a pointer that is shifted through your memory.

So use the following iterator

general : matrix.at<elementType>(i,j);
example : test.at<double>(4,3);

However if you would like to perform some mathematical functions to the elements like elementwise multiplying, that is possible using the mul() operator.

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Asked: 2013-04-09 13:15:27 -0500

Seen: 300 times

Last updated: Apr 09 '13