Can I calculate the amount of black and white pixels inside a freehand region?

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Koen van Assen
Koen van Assen 2018-3-1
回答： Amy Haskins 2018-3-1
I have created a binary image. What I want to do is select a certain region of it with freehand and then find the total number of white and black pixels, as well as the total amount of pixels in that particular region. Is this possible?
hFH = imfreehand();
Image1=hFH.createMask();
numberOfPixels1 = sum(Image1(:)) %this gives the total number of pixels in the freehand region
nBlack1 = sum(Image1(:)==0); %But how about the number of black pixels because this does not work

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Amy Haskins
Amy Haskins 2018-3-1
The mask just tells you which pixels are in the region. To count the black pixels within the mask, you need to look at both in the region and the value in the original image. Something like this:
nBlack1 = sum(sum(Image1 & ~origImage))

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