How can I apply a logical mask to an image variable?

Hello,

I am trying to apply a logical mask to an image variable, however I couldnt manage to do it so far.

I have tried

maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
maskedRgbImage = rgbImage.*mask

Also, I've tried to apply mask to the rgbImage.CData directly. All of them are giving me errors. What else I can try?

Thank you so much

[Walter Roberson]

Your rgbImage is a handle to a deleted image() object -- not an array of data.

[dila suay]

Hi Walter, thank you for your quick reply. I uploaded a .fig version. I hope it is useful

Answer 1

[Walter Roberson]

rgb = rgbImage.CData;
maskedImage = rgb .* cast(repmat(c, [1 1 size(rgb,3)]),'like',rgb);

This cannot be an image() object unless you want to do something like

maskedRgbImage = copyobj(rgbImage, gca);
rgb = rgbImage.CData;
maskedImage.CData = rgb .* cast(repmat(c, [1 1 size(rgb,3)]),'like',rgb);

... but that would be directly on top of the old image.

[dila suay]

Thank you so much for your quick replies Walter. It says

Unrecognized function or variable 'c'.

What is c?

[Walter Roberson]

rgb = rgbImage.CData;
maskedImage = rgb .* cast(repmat(mask, [1 1 size(rgb,3)]),'like',rgb);

or

maskedRgbImage = copyobj(rgbImage, gca);
rgb = rgbImage.CData;
maskedImage.CData = rgb .* cast(repmat(mask, [1 1 size(rgb,3)]),'like',rgb);

Answer 2

[Image Analyst]

You don't need to do both of these:

maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
maskedRgbImage = rgbImage.*mask

All you need is the first one. Don't do the second one. It's not right and would need "fixing".

[Kaitlin Wang]

sir you are my hero. i have been looking at your answers for weeks and learning so much. thank you