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First split the complex (2 channel) image in two separate images containing the real and imaginary part:

Mat planes[2];
split(canny_image,planes);

...assuming that the canny_image is complex. Then use the cartToPolar function to get the phase (angle) and magnitude:

Mat magn,angl;
cartToPolar(planes[0],planes[1],magn,angl);

You can do this in two steps using the magnitude and phase functions in a similar manner.

More info here: http://docs.opencv.org/modules/core/doc/operations_on_arrays.html

First split the complex (2 channel) image in two separate images containing the real and imaginary part:

Mat planes[2];
split(canny_image,planes);

...assuming that the canny_image is complex. Then use the cartToPolar function to get the phase (angle) and magnitude:

Mat magn,angl;
cartToPolar(planes[0],planes[1],magn,angl);
cartToPolar(planes[0],planes[1],magn,angl,true);

You can do this in two steps using the magnitude and phase functions in a similar manner.

More info here: http://docs.opencv.org/modules/core/doc/operations_on_arrays.html