Error Concealment | JPEG | MPEG-4 | Wavelet | YUV

Hey guys,

I am working on a lab project for image processing in visual c++, a
part of the lab is to get the user to enter the Point spread function
which is supposed to be a two dimensional array. Now it says that the
array has to be multiplied by a suitable scalar such that the dc gain
is 1. Now I know that the dc gain of a 1-d filter can be found by the
sum of the point spread function coefficients. How would we find the
dc gain of a 2-d filter?

thanks a lot guys
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