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non-green extraction problem from image

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mehmet oztu
mehmet oztu 2015-9-3
评论： Image Analyst 2015-9-5
Hello, I'm trying to extract non-green from images, however It fails and does not give me a proper result. Do you know the reason? Why does it result with non-proper image? Thanks a lot.
Please see below orjinal image and result, also my matlab code.
orjinal and segmented image:
my code:
al1 = imread('image');
tex=single(al1);
%
r=single(al1(:,:,1));
g=single(al1(:,:,2));
b=single(al1(:,:,3));
ExGreen=2*g-r-b;
ExRed=1.4*r-g-b;
dev=imsubtract(ExGreen,ExRed);
% otsu thresholding
thres_level = multithresh(dev); % automatic thresholding
%b_w = im2bw(dev,thres_level);
seg_I = imquantize(dev,thres_level);
%
RGB = label2rgb(seg_I,'gray');
RGB2 = single(bwareaopen(RGB,1000));
% remove the only background
BW = RGB2(:,:,1);
BW = uint8(imfill(BW,'holes'));
leaves_only = al1;
for a = 1:3
leaves_only(:,:,a) = leaves_only(:,:,a).*BW;
end
figure;
axis off
title('RGB Segmented Image')
k=imfuse(al1, leaves_only,'montage');
imshow(k)

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回答（2 个）

Image Analyst
Image Analyst 2015-9-3
Try the Color Thresholder app on the Apps tab.
Or else see my color segmentation tutorials in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
Image Analyst
Image Analyst 2015-9-3
Try the attached m-file where I extract the non-green parts.
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mehmet oztu
mehmet oztu 2015-9-4
thanks Image Analyst, I found out a solution.
Image Analyst
Image Analyst 2015-9-5
You're welcome. I just came back here because I noticed you have not marked it as Accepted. Are we done now, or do you still need help?

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