I have a binary image and want to find the area of white in the image

I used rgb2gray(), im2bw and I have a Binary Image all is to find the area of the white portion

Answer 1

[Image Analyst]

There are 3 ways

area1 = bwarea(binaryImage)
area2 = sum(binaryImage(:))
measurements = regionprops(logical(binaryImage), 'Area');
area3 = sum([measurements.Area])

The first one uses a different algorithm than the other two and will give different results depending on the shape of the boundary. The second two are just pixel counting.

[MJ Thangaraj]

But the Answer is in Pixels.What should I do to get it in cm2 or some other world units?

[Image Analyst]

See my attached spatial calibration demo. If that answers all your questions, can you mark it as Accepted?