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how can i detect sky

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Eren Aslan
Eren Aslan 2022-3-29
评论： Adam Danz 2022-3-30
Hello
I want to detect sky in a image and chang it colour to black.How can i do that?
For example this image:
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Adam Danz
Adam Danz 2022-3-29
编辑：Adam Danz 2022-3-29
@Eren Aslan for your simple image of a nearly uniform background, I would start with regionprops to segment the plane and then assume everything else is sky (including the ocean in my image above). However, it will not work with more complex backgrounds.
Sam Chak
Sam Chak 2022-3-29
@Eren Aslan Are you trying to develop the MATLAB-based "Magic Wand"? Sound like an interesting project!

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yanqi liu
yanqi liu 2022-3-30
Ran in:
yes，sir，for more image，may be use DeepLearning to segment
but just for this image，we can use some simple method，such as
im = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/945114/image.jpeg');
jm = rgb2lab(im);
s = imcomplement(mat2gray(jm(:,:,3)));
bw = im2bw(s, graythresh(s));
im2 = im;
% make sky to black
r = im2(:,:,1);g = im2(:,:,2);b = im2(:,:,3);
r(bw) = 0; g(bw) = 0; b(bw) = 0;
im2 = cat(3,r,g,b);
figure;
subplot(2,2,1); imshow(im,[]);
subplot(2,2,2); imshow(s,[]);
subplot(2,2,3); imshow(bw,[]);
subplot(2,2,4); imshow(im2,[]);

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