how to find the number of pixels in the white region of a binary image

I want to get the number of pixels o the white area in the given binary image. is there any code available to know tha same. The ultimate need is to find the area of the region by multiplying number of pixels with area of one pixel

Answer 1

[Raghav]

Hi @Rah Ul

As white pixels have a value=1 (and black pixels' value=0), doing sum of pixel values can return the total number of white pixels in the binary image. If Image is stored in "Im", you can write the expression:

WhiteNum=sum(Im(:));

If you want to find the area of object formed by white pixels, use the function - bwarea().

To understand more about bwarea(), refer to the link that I am attaching below:

https://in.mathworks.com/help/images/ref/bwarea.html

Answer 2

[Image Analyst]

You can use nnz or bwarea

Note they give different counts. nnx is strictly a count of the number of pixels. bwarea weights the counts by the shape of the boundary.

binaryImage = [0,1;1,1]

binaryImage = 2×2

0 1 1 1

numWhite = nnz(binaryImage)

numWhite = 3

area = bwarea(binaryImage)

area = 3.1250