compute_subwindows_energy.m

image denoising toolbox in matlab

function D = compute_subwindows_energy(M,k)

% compute_subwindows_matrix - compute the energy of each patch around each pixel.
%   
%   D = compute_subwindows_energy(M,k);
%
%   D(i,j) = \sum{ x \in P_{ij} }{ M(i,j)^2 }
%
%   where P_{ij} is the patch of size (2k+1)x(2k+1) around
%   pixel (i,j).
%
%   Copyright (c) 2004 Gabriel Peyr