How to create a mask for the image

I want to generate a mask for my image.How can I generate it?
The mask image should be like the below picture.

 Accepted Answer

Mask = (YourImage>threshold);

2 Comments

How do you get the matrix dimensions for the image agree with the dimensions of the threshold?
You don't. Here, threshold is just a scalar. No dimensions at all really, just a 1-by-1 scalar -- it's not an image with any dimensions. So the "matrix dimensions for the image" do not need to agree with anything, since threshold is a scalar.

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on 23 Oct 2015

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on 30 Oct 2019

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