how to do masking with the help of binary image?

Hi,

I have a binary image and using that binary image I wish to do masking.

Here is the binary image:

Using this binary image I want to mask to the original Image.

Here is the original Image:

I want the output as :

So, the output image should have the binary image portion and the remaining should be black("0").

Can you suggest me the code to do this.

Thanks...

Answer 1

[Guillaume]

repmat your binary image across the three colour channels and use the invert of that as logical index into your colour image to set the pixels to 0:

colourmask = repmat(binarymask, [1 1 3]);
maskedimage = colourimage;
maskedimage(~colourmask) = 0;

Answer 2

[Image Analyst]

Here's a way that Sean recommends:

% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, class(rgbImage)));

It works for grayscale images too. I also attach some full demos, if you're interested.