No of computation in the process of applying Low pass filter(AxB) on Image having dimension NxM

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I am willing to calculate no of computation in the process of applying Low pass filter(AxB) on Image having dimension NxM.

Can anyone please help out?

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David Clifte On BEST ANSWER

There are many methods to do this, since convolution to Fourier analysis among others.

If you wants to do a convolution you have to run over the image I(mn) with a mask M(AB). considering that you only run over internal parts of the image you will do (N-A)(M-B)(A*B*2) operation approximately.

Fourier filtering I have to take a look better but in bigger images is much more efficient.