Apply mask to RGB image. If mask is RGB as well do i have to seperet the mask to its channels too?

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fadams18 2020-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/503168-apply-mask-to-rgb-image-if-mask-is-rgb-as-well-do-i-have-to-seperet-the-mask-to-its-channels-too

评论： fadams18 2020-2-1

采纳的回答： Subhadeep Koley

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Hello I want to apply this mask onto this RGB color to use in NMF

...

function [ R, B,G ] = Split_Image( )
 
Input=im2double(imread('dataset/transport_clean.png'));
mask=im2double(imread('dataset/transport_mask.png'));
Q=mask(:,:,1); 
R=Input(:,:,1);
G=Input(:,:,2);
B=Input(:,:,3);
 
X_red = Q.*R;
X_gre = Q.*G;
X_blu = Q.*B;
imshow(X_red);
end

So I want to inprint the left image on the right image to get an output in the third image.

How ever in my case i will have a red blue green channel with the masks.

I will then process these 3 images seperately using nmf and combine them after to reconstuct the original image

How ever when i run my code i get the same image below for all channels. What am i doing wrongly

采纳的回答

Subhadeep Koley 2020-2-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/503168-apply-mask-to-rgb-image-if-mask-is-rgb-as-well-do-i-have-to-seperet-the-mask-to-its-channels-too#answer_413271

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Hi, refer the code below.

function [ R, B, G ] = Split_Image()
    input = im2double(imread('transport_clean.png'));
    figure; imshow(input, []); title('Input image');
    mask = imcomplement(im2double(rgb2gray(imread('transport_mask.png'))));
    added = input + mask *0.3;
    R = added(:, :, 1);
    G = added(:, :, 2);
    B = added(:, :, 3);
    figure; imshow(added, []); title('Mask over the input image');
end

Yes, you're used to multiply the mask with the input. However, in my code I have used a technique called Alpha Blending. I have added the mask with the input image where, the mask is modulated with a Alpha (0.3 in this case) value.

If you increase the Alpha value then, the text will be more prominent in the resulting image.

fadams18 2020-2-1