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

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Oman Wisni
Oman Wisni 2018-9-25
评论： Oman Wisni 2018-9-27
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
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
Oman Wisni 2018-9-26
How you get the maskedRGB? Do you multiply multiply the original image with mask?

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采纳的回答

Image Analyst
Image Analyst 2018-9-26
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
Image Analyst 2018-9-27
If you get holes in your leaf, and don't want them, you can call
mask = imfill(mask, 'holes');

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Akira Agata
Akira Agata 2018-9-26
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
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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