How to implement LAB color space to detect yellow in image?

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Valeska Pearson
Valeska Pearson 2013-7-23
编辑： Walter Roberson 2016-4-3
>>Hello, I need some help to detect yellow exudates in a retinal image. LAB or HSV colour space can be used. I have chosen the LAB colour space. How must the if statement look if the user use gtool and clicks on yellow dot to segment that or identify that as a yellow exudate?
here is my code:
RGB2=im2double(OriginalRGB);
cform = makecform('srgb2lab');
lab = applycform(RGB2,cform);
figure,imshow(RGB2);
[d1 d2]=size(RGB2);
yellow_redThreshold = 200;
yellow_greenThreshold = 200;
[X Y]=ginput(2);
x=round(X);
y=round(Y);
punt=[x y];
for a=1:x
for b=1:y
if (yellow_redThreshold < punt <yellow_greenThreshold)
figure,imshow(punt, []);
title('Yellow exudate');
end
end
I want it to do something like this
  1 个评论
Narges M
Narges M 2013-7-23
Do you mean something like this?
punt=lab(x,y,:);
if ((punt(1,2,1) < greenThreshold) && (punt(1,3,1) > redThreshold))
...
end

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