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arithmetic mean filter

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neetika Karwasra
neetika Karwasra 2012-1-27
In arithmetic mean filter meanfilteredimage = filter2( ones([convwindowsize, convwindowsize]), noiseimage) / prod([convwindowsize, convwindowsize]); what is role of convwindowsize here and can we take any value for this

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Image Analyst
Image Analyst 2012-1-27
It is the size of the window (along one side) that you're going to sum up within. filter2() multiplies and sums, so to get the mean you need to divide that result by the number of pixels, which is convwindowsize^2 or prod([convwindowsize, convwindowsize]). For example if you're going to average within a 3 by 3 window, you're summing up 9 values, but you don't want the sum you want the mean, so you need to divide by 9.

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