MATLAB: How to calculate sum of black pixel in binary image

image analysisImage Processing Toolbox

I need to find sum of all black pixels present in my input image. How can I do it in simple way thanks in advance

Best Answer

Try this:

numBlackPixels = sum(yourImage == 0);

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MATLAB: Total area of a region of binary image

Huh? Of course you can use regionprops. No need to use bwboundaries() at all, unless you just want to show the outlines of the segmented areas in the overlay above your original gray scale or color image.

If you want the area of all the white pixels in your binary image you can do it two ways, with slightly different results because they use different calculation methods

pixelSum1 = bwarea(binaryImage);
pixelSum2 = sum(binaryImage(:));

If you want the area of each blob in the image individually, you can do it like this:

labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Area');
allAreas = [measurements.Area];  % List of all the blob areas.
totalAreaOfAllBlobs = sum(allAreas); % Will be the same as pixelSum2

MATLAB: How to calculate area of an irregular shape region in a binary image

Try this:

props = regionprops(binaryImage, 'Area');
allAreas = [props.Area]

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MATLAB: Total area of a region of binary image

MATLAB: How to calculate area of an irregular shape region in a binary image

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