find_diffs.m

find_diffs.m - mode = 1 - return a sorted list of...

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Sheet1 Page 1 function L = find_diffs(A,B,mode) %$Revision: 1.3 $ $Author: mmccann $ $Date: 2004/05/09 22:16:14 $ % L = find_diffs(A,B [,mode]) - returns an array of vectors of the small % matrix A and a larger matrix B that represents the differences % between the matrix A and all subregions of B that overlap with A. % Each position in L contains the difference when the upper left-hand % corner of A is aligned at that position in B. Thus the dimensions % of L will be (rows(A)-rows(B)+1) by (cols(A)-cols(B)+1) rows by 3 % columns in debugging mode. In non debugging mode, there will be % just one entry corresponding to the smallest returned. % mode = 0 - return the smallest difference postion only (default) %
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Unformatted text preview: mode = 1 - return a sorted list of differences in ascending order global GL if nargin < 3 mode = 0 end % calculate B2 [rows cols] = size(A) S = ones(rows,cols) B2 = filter2(S,B.^2,'valid') % calculate sum over A squared sumA2 = sum(sum(A.^2)) % calculate A conv B AB = filter2(A,B,'valid') % calculate D D = (-2*(AB)+B2)+sumA2 [rows cols] = size(D) if mode tL = zeros(rows*cols,3) L = zeros(rows*cols,3) count = 0 else L = [D(1,1) 1 1] end for i=1:rows for j=1:cols if mode count=count+1 tL(count,1:3) = [D(i,j) i j] else if D(i,j) < L(1,1) L = [D(i,j) i j] end end end Sheet1 Page 2 end if mode [Y I] = sort(tL(:,1)) for i = 1:count L(i,1:3) = tL(I(i),1:3) end end if mode > 0 GL = L end...
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find_diffs.m - mode = 1 - return a sorted list of...

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