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extract only white pixels from an image

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Mary Baratzadeh
Mary Baratzadeh 2019-12-28
评论： Mary Baratzadeh 2019-12-30
How can I extract mean and variance of only white pixels of an image?

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Image Analyst
Image Analyst 2019-12-28
编辑：Image Analyst 2019-12-28
What value do you consider "white"? Let's say it's 230. Then you can get a binary image
binaryImage = grayImage >= 230;
Now, exactly what does "extract" mean to you? You want to consider all the gray values in the binary image? If so do
maskMean = mean(grayImage(binaryImage));
maskSD = std(grayImage(binaryImage));
maskVar = var(grayImage(binaryImage));

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