non-green extraction problem from image

Question

0 个投票

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)