How to apply a High Pass Filter to a complex matrix

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I have an image converted to the frequency domain using FFT (i.e. I have a matrix of complex values). I want to apply a High Pass filter to enhance edges. This should be a straight multiplication to every pixel using the Filter.

How do I create the filter? I understand that it means zeroing all frequency components bellow a cutoff frequency. But my Matrix is simply a bunch of "a + bi" values....

What am I zeroing? Which ones?

Been to long since my Signals and Systems studies... oi.

Posted 23-Dec-09 9:06am

N_tro_P

Updated 28-Dec-09 3:25am

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Christian Graus · Answer 1 · 2009-12-23T11:05:00

Solution 1

wrote:
I understand that it means zeroing all frequency components bellow a cutoff frequency. But my Matrix is simply a bunch of "a + bi" values....

So you iterate over them and zero the elements below the cutoff.

Posted 23-Dec-09 11:05am

Christian Graus