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Scientific Computing & Data Science

[Image Processing] Edge Detector / Homogeneity Operator 본문

Scientific Computing/Image Processing

[Image Processing] Edge Detector / Homogeneity Operator

cinema4dr12 2014. 6. 7. 11:26

MATLAB CODE: "HomogeneityOperator.m"

function HomogeneityOperator %% read an image img = imread('./res/test_02.jpg'); imshow(img); img = rgb2gray(img); subplot(2,1,1); [nrow, ncol] = size(img); img = cast(img, 'double'); newImg = zeros(nrow,ncol); % Corners i = 1; j = 1; tmp(1) = abs(img(i,j) - img(i,j+1)); tmp(2) = abs(img(i,j) - img(i+1,j+1)); tmp(3) = abs(img(i,j) - img(i+1,j)); newImg(i,j) = max(tmp); i = 1; j = ncol; tmp(1) = abs(img(i,j) - img(i+1,j)); tmp(2) = abs(img(i,j) - img(i+1,j-1)); tmp(3) = abs(img(i,j) - img(i,j-1)); newImg(i,j) = max(tmp); i = nrow; j = ncol; tmp(1) = abs(img(i,j) - img(i,j-1)); tmp(2) = abs(img(i,j) - img(i-1,j-1)); tmp(3) = abs(img(i,j) - img(i-1,j)); newImg(i,j) = max(tmp); i = nrow; j = 1; tmp(1) = abs(img(i,j) - img(i-1,j)); tmp(2) = abs(img(i,j) - img(i-1,j+1)); tmp(3) = abs(img(i,j) - img(i,j+1)); newImg(i,j) = max(tmp); % Edges i = 1; for(j = 2:ncol-1) tmp(1) = abs(img(i,j) - img(i,j-1)); tmp(2) = abs(img(i,j) - img(i+1,j-1)); tmp(3) = abs(img(i,j) - img(i+1,j)); tmp(4) = abs(img(i,j) - img(i+1,j+1)); tmp(5) = abs(img(i,j) - img(i,j+1)); newImg(i,j) = max(tmp); end i = nrow; for(j = 2:ncol-1) tmp(1) = abs(img(i,j) - img(i,j-1)); tmp(2) = abs(img(i,j) - img(i-1,j-1)); tmp(3) = abs(img(i,j) - img(i-1,j)); tmp(4) = abs(img(i,j) - img(i-1,j+1)); tmp(5) = abs(img(i,j) - img(i,j+1)); newImg(i,j) = max(tmp); end j = 1; for(i = 2:nrow-1) tmp(1) = abs(img(i,j) - img(i-1,j)); tmp(2) = abs(img(i,j) - img(i-1,j+1)); tmp(3) = abs(img(i,j) - img(i,j+1)); tmp(4) = abs(img(i,j) - img(i+1,j+1)); tmp(5) = abs(img(i,j) - img(i+1,j)); newImg(i,j) = max(tmp); end j = ncol; for(i = 2:nrow-1) tmp(1) = abs(img(i,j) - img(i+1,j)); tmp(2) = abs(img(i,j) - img(i+1,j-1)); tmp(3) = abs(img(i,j) - img(i,j-1)); tmp(4) = abs(img(i,j) - img(i-1,j-1)); tmp(5) = abs(img(i,j) - img(i-1,j)); newImg(i,j) = max(tmp); end % Inner for(i = 2:nrow-1) for(j = 2:ncol-1) tmp(1) = abs(img(i,j)-img(i-1,j-1)); tmp(2) = abs(img(i,j)-img(i-1,j)); tmp(3) = abs(img(i,j)-img(i-1,j+1)); tmp(4) = abs(img(i,j)-img(i,j-1)); tmp(5) = abs(img(i,j)-img(i,j+1)); tmp(6) = abs(img(i,j)-img(i+1,j-1)); tmp(7) = abs(img(i,j)-img(i+1,j)); tmp(8) = abs(img(i,j)-img(i+1,j+1)); newImg(i,j) = max(tmp); end end subplot(2,1,2); newImg = cast(newImg, 'uint8'); imshow(newImg); end


테스트용 이미지(test_02.jpg)



결과 (위: 원본 이미지, 아래: 에지 검출된 이미지)

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