how to mask the image and keep only one color "green channel"?

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Oman Wisni 2018-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/420754-how-to-mask-the-image-and-keep-only-one-color-green-channel

评论： Oman Wisni 2018-9-27

采纳的回答： Image Analyst

Hi, here I have one photo and the code, please anyone help me to fix my code, I want to mask the binary with the RGB.

% Extract the individual red, green and blue color channel

redChannel = hasilcontrast(:,:,1);

greenChannel = hasilcontrast(:,:,2);

blueChannel = hasilcontrast(:,:,3);

% Create the mask

mask = cast(green, class(hasilcontrast));

redmask = redChannel.*mask;

greenmask = greenChannel.*mask;

bluemask = blueChannel.*mask;

% segmentasi

maskRGBimage = cat(3,redmask, greenmask, bluemask);

I not get the result, how I do to show the image. please help me sir

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Oman Wisni 2018-9-26

Yes, I want like that, can you show me the code? I'm sorry, I confused how I explain, but your answer is right

Oman Wisni 2018-9-26

How you get the maskedRGB? Do you multiply multiply the original image with mask?

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Image Analyst 2018-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/420754-how-to-mask-the-image-and-keep-only-one-color-green-channel#answer_338425

I've done this so many times I lost track, and some time back decided to make a demo of it. Leaf, fruit, money, handwriting, leaf, fruit, money, handwriting, everyone wants to segment a leaf, fruit, money, or handwriting. Click on the tag "leaf" on the right hand side of this page. See attached demo.

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Image Analyst 2018-9-27

在 MATLAB Online 中打开

If you get holes in your leaf, and don't want them, you can call

mask = imfill(mask, 'holes');

Oman Wisni 2018-9-27

Yes sir, thanks.. Sir, the value 200, is that default value?

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Akira Agata 2018-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/420754-how-to-mask-the-image-and-keep-only-one-color-green-channel#answer_338428

在 MATLAB Online 中打开

Hi Oman-san,

Thank you for your prompt reply. The following is the code to generate the posted figure. I hope this will be some help for your research!

% Read the image
I = imread('base1.bmp');
% Create a mask based on a green channel of the image
BWmask = ~imbinarize(I(:,:,2));
BWmask = imfill(BWmask,'holes');
% Create a masked RGB image
Imasked = immultiply(I,repmat(BWmask,[1 1 3]));
% Show the results
figure
subplot(2,2,1)
imshow(I)
title('Original','FontSize',12)
subplot(2,2,2)
imshow(BWmask)
title('Mask','FontSize',12)
subplot(2,2,3)
imshow(Imasked)
title('Masked RGB','FontSize',12)

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Oman Wisni 2018-9-26

编辑：Oman Wisni 2018-9-26

thanks sir, you only keep green channel, I think all channel have been mask than you recombine again..

Im sorry sir, after I see your code that is not I mean. Like my code in above I want mask all channel in RGB channel, I get the mask every channel then I combine again. for mask I using multiply, and for recombine I using maskRGBimage = cat(3,redmask, greenmask, bluemask); and the result only keep green channel, I already upload the picture index.jpg, I want like that but no saturation channel.

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