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How do I apply a mask to a gray image?

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Adriano Morais
Adriano Morais 2016-5-9
编辑： Walter Roberson 2016-5-10
Hey guys I'm trying to apply a mask to an image which I need to work on, I've tried to use the following code and didnt get what I need.
This is the image: http://imgur.com/flVD3Wn
And this is the mask Im trying to apply: http://imgur.com/rHuwzSH
I=imread('02_dr.JPG');
mask=imread('02_dr_mask.tif');
J=rgb2gray(I);
subplot(2,3,1); imshow(J), title('Original Grayscale');
subplot(2,3,4); imhist(J), title('Histograma 1');
subplot(2,3,2); imshow(mask), title('Mask');
subplot(2,3,5); imhist(mask), title('Histograma Mask');
% Mask the image using bsxfun() function
maskedImage = bsxfun(@times, J, cast(mask, 'like', J));
subplot(2,3,3); imshow(maskedImage), title('MaskedImage');
subplot(2,3,6); imhist(maskedImage), title('Histograma MaskedImage');
I have also tried the following instead of Inew = image.*repmat(mask,[1,1,3]);
Inew=image.*mask;

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回答（1 个）

Image Analyst
Image Analyst 2016-5-9
First of all, don't ever call your image "image" because that is the name of a very important built-in variable.
Try this:
% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
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Adriano Morais
Adriano Morais 2016-5-9
I have uploaded my image, the mask, and the code.

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