Lab gradient filter
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% Convert an image to the Lab color space | |
colorTransform = makecform('srgb2lab'); | |
img = applycform(rgbImg, colorTransform); | |
% Make it double to improve representation | |
img = double(img); | |
% Find x and y derivative of a 9x9 gaussian | |
[hx, hy] = gradient(fspecial('gaussian',[9 9],sigma)); | |
% Apply filters | |
gx = double(imfilter(img,hx,'replicate')); | |
gy = double(imfilter(img,hy,'replicate')); | |
% Find absolute value | |
gSquared = sqrt(gx .* gx) + (gy .* gy); | |
% Apply non-maxima suppression (find best points for edges) | |
[mag, ] = max(gSquared, [], 3); |
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