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How would you create a mask on an image?

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Feynman
Feynman 2013-10-5
评论： Image Analyst 2013-10-5
I am doing a project and one of the tasks is to create a matrix with number of pixels x number of pixels x 3 as its size. In the previous task I created a matrix using the green container of the RGB image and I am suppose to duplicate this along the 3 dimensions. My question is what functions would I use in order to do this. I am not allowed to use any implicit functions only explicit.
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Feynman
Feynman 2013-10-5
I tried implementing the code you suggested and it keeps giving me an error of integers can only be combined with integers of the same class or scale doubles
Image Analyst
Image Analyst 2013-10-5
mark and redChannel have to be the same type of integer like it said. So you'd need to do
maskedRed = redChannel .* uint8(mask);
if redChannel is a uint8.

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Image Analyst
Image Analyst 2013-10-5
Here's one method:
% Multiply the mask by each color channel individually.
maskedRed = redChannel .* mask;
maskedGreen = greenChannel .* mask;
maskedBlue = blueChannel .* mask;
% Recombine separate masked color channels into a single, true color RGB image.
maskedRgbImage = cat(3, maskedRed, maskedGreen, maskedBlue);
Here's another method, suggested by Sean D.
% Mask the image.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask,class(rgbImage)));

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Walter Roberson
Walter Roberson 2013-10-5
repmat() or cat(3,X,X,X)

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