How to multiply binary image and rgb image in matlab?

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bay rem 2016-3-3

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评论： Sanzhar Askaruly 2018-10-31

I have a binary image which is the segmented form of another color image . As you know , a binary image is 2-d but an rgb image is 3-d , how want to multiply them together ? i tried this code but an error is generated: function skinCrop(bwSkin,colorSkin)

for i = 1:size(colorImage,1)
    for j = 1:size(colorImage,2)
        if bwImage(i,j) == 0
            colorImage(i,j,:) = 0;
        end
    end
end
imshow(colorImage);
end

and here there is the error:

Index exceeds matrix dimensions.

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bay rem 2016-3-3

its the complete error,thank you, i'll check the sizes

Sanzhar Askaruly 2018-10-31

I tried your code, it worked, so it seems sizes are the problem.

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采纳的回答

Image Analyst 2016-3-3

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在 MATLAB Online 中打开

There are several ways to do what you want, though bsxfun() is the method I usually use (though it's more cryptic than the .* straightforward method). I first learned that from Sean DeWolski of the Mathworks. However, if bwImage is not the same integer type as colorImage, you will have to modify it.

% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, colorImage, cast(bwImage, 'like', colorImage));

If they're already both the same data type, then having cast in there won't hurt so I always put it in there regardless.

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更多回答（1 个）

Jan 2016-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/271203-how-to-multiply-binary-image-and-rgb-image-in-matlab#answer_212148

在 MATLAB Online 中打开

if both images have the same number of pixels:

result = colorImage .* cat(3, bwImage, bwImage, bwImage);

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Image Analyst 2018-3-19

You might also want to try using an overlay:

http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

http://www.mathworks.com/matlabcentral/answers/104889-how-to-overlay-a-foreground-image-over-a-background-image

swathi 2018-3-19

Thank you very much sir. It worked. Can I extend me query a little more, if you don mind(Sorry for it). Can I use this code to remove object from all frames in which it(or part of it) is visible? I need some advice, as I am working 1st time on videos. Thanks in advance

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