using the attached color image and ROI mask and how can I remove the background from the image and retain only the approximate ROI.

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Nosipho Majola 2021-12-12

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评论： Image Analyst 2021-12-12

采纳的回答： Matt Gaidica

the color image must have the dark background in the output image.

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Matt Gaidica 2021-12-12

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在 MATLAB Online 中打开

IM = imread('ROI.png');
mask = logical(imread('mask.png'));
rmMask = bsxfun(@times, IM, cast(mask, 'like', IM));
close all
figure;
imshow(rmMask);

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Nosipho Majola 2021-12-12

编辑：Nosipho Majola 2021-12-12

Thank you Matt. Would you please help me out with a code that does not use built-in functon but still does the same thing? i.e. not using bsxfun()

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Image Analyst 2021-12-12

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编辑：Image Analyst 2021-12-12

在 MATLAB Online 中打开

Looks like you've accepted Matt's answer so you probably don't need this but

rgbImage = imread('ROI.png');
mask = logical(imread('mask.png'));
% Make mask 3-D
mask = cat(3, mask, mask, mask);
rgbImage(~mask) = 0;

I haven't tested it but that will probably work. If it's not your homework, try that.

If it's your homework then you may not be able to use imread(), cat(), logical(), imshow(), etc. so see this link:

What can be programmed "without any built-in functions" ? - MATLAB Answers - MATLAB Central

and of course you wouldn't be able to use our code either - that would be even worse than using built-in functions and you could face disciplinary action.

How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central

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Nosipho Majola 2021-12-12

@Image Analyst I did run the previous code you had given and the output image was not the one I was expecting, which is the one written "masked image" in this new code.

about the function, I did see that yours does not have it. it just that the output image was different from the one required.

i am about to try the edited one now, thank you.

Image Analyst 2021-12-12

OK, well if you run my demo with images called image1 and image2, it should look identical to the screenshot I posted in my last comment. If you alter it (like to handle your image names, or display things somewhat differently) and it doesn't work, then post your screenshot, two original images with the paperclip icon, and your code and I'll fix it.

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