removing Non-green background from image

hello,

I'm trying to eliminate non-green background from an image. You can see my below codes, I think It's working. But the thing is, after this process (or any other suggestion), I want to keep leaves as exactly in original photos without background.

Many thanks in advance.

Orjinal photo:

I want to get like this(you can see background is black, means it's removed):

al1 = imread('23.JPG');        

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,1); % automatic thresholding
seg_I = imquantize(dev,thres_level);

RGB = label2rgb(seg_I,'gray');

RGB2 = single(bwareaopen(RGB,1000000)); %clean the areas smaller than 1million pixels

k=imfuse(al1, RGB2,'montage'); %composite of 2images
imshow(k)

[Madhulatha K N]

thank you for posting the question. it is helping me with a project where I need to do the same as you are doing. But what are ExGreen nd ExRed variables in the code? what are they being calculated for?

Answer 1

[Jon]

Try this:

BW = RGB2(:,:,1);
BW = uint8(imfill(BW,'holes'));
leaves_only = al1;
for a = 1:3
    leaves_only(:,:,a) = leaves_only(:,:,a).*BW;
end
imshow(leaves_only)

[mehmet oztu]

many many thanks Jon, appreciated.