i have coding for enhancement of contrast for image. NEED EXPLANATION FOR CODES BEING USED

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Gursheen
Gursheen 2014-3-2
评论： Gursheen 2014-3-3
[ m, n ] = size ( gray );
gray3d = zeros ( 8, m, n ) ;
%
% For pixel (I,J), GRAY3D(*,I,J) contains the 8 neighboring values.
%
gray = double ( gray );
gray3d(1,:,:) = circshift ( gray, [ -1, -1 ] );
gray3d(2,:,:) = circshift ( gray, [ -1, 0 ] );
gray3d(3,:,:) = circshift ( gray, [ -1, 1 ] );
gray3d(4,:,:) = circshift ( gray, [ 0, -1 ] );
gray3d(5,:,:) = circshift ( gray, [ 0, 1 ] );
gray3d(6,:,:) = circshift ( gray, [ 1, -1 ] );
gray3d(7,:,:) = circshift ( gray, [ 1, 0 ] );
gray3d(8,:,:) = circshift ( gray, [ 1, 1 ] );
%
% Average the values.
%
gray_average = sum ( gray3d ) / 8.0;
%
% The SUM operation on an (L,M,N) array returns a (1,M,N) array.
%
%
gray_average_2d(1:m,1:n) = gray_average(1,1:m,1:n);
%
% Compute the new value for the center pixel.
%
gray_contrast = ( 1.0 - s ) * gray_average_2d(:,:) + s * gray;
gray_contrast = uint8 ( gray_contrast );
%
% The pixels on the boundary have been handled incorrectly.
% A more careful treatment could correctly enhance their contrast too.
% Instead, just restore them to their original values.
%
gray_contrast(1,:) = gray(1,:);
gray_contrast(m,:) = gray(m,:);
gray_contrast(:,1) = gray(:,1);
gray_contrast(:,n) = gray(:,n);
return
end

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回答（1 个）

Image Analyst
Image Analyst 2014-3-2
What are you doing? It sort of looks like a convolution but in some kind of crazy algorithm. What's the intent of this function? What are you doing that can't be done with conv2(), imfilter(), or imsharpen()? And, what is your question - you forgot to state it.
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Gursheen
Gursheen 2014-3-3
ohk sir...actually what i want to do is enhance the contrast of the ultrasound image. by forming a mask and then working on pixel by pixel..then changing the value of the center pixel to the new sharpness formula that has been mentioned here. and then after putting that formula for all pixel values in that image, the contrast gets improves and hence obtaining the new ehanced image...please help me out with this if possible please
Gursheen
Gursheen 2014-3-3
SIR ALSO IF YOU COULD PLEASE EXPLAIN ME WHAT THESE TWO LINES IN THE CODING MEAN.... The SUM operation on an (L,M,N) array returns a (1,M,N) array. gray_average_2d(1:m,1:n) = gray_average(1,1:m,1:n);
THANKS A LOT FOR YOUR HELP..

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