MATLAB: How to find the area of a binary image

edgeimage processing

Hi, I need to find the area of this image (around the outer edge). Anyone got an idea? Thanks!!!!!

To find the actual boundary, invert, fill, and sum

binaryImage = imfill(~binaryImage, 'holes');
numPixels = sum(binaryImage(:));

If you want a smooth boundary, you need to use activecontour(), like in my attached demo.

Use imfill():

binaryImage = imfill(binaryImage, 'holes');

Try this:

binaryImage = bwconvhull(binaryImage, 'union');
area = bwarea(binaryImage);
% or for a simple sum of pixels:
area = sum(binaryImage(:));