How can I measure how many pixels a single irregular object has?

I have an image with many irregular objects. How can I measure how many pixels each irregular object has? The image is shown as the follows. Thanks a lot!

Answer 1

[Ben11]

If you have the Image Processing Toolbox it looks like this link might answer your question. It's an example from The Mathworks showing how to treshold an image and identify objects in it (steps 5 and further) as well as how to compute their area, which is what you want.

Answer 2

[Ahmet Cecen]

I assume the sea of blue there are all 0s, so I would do image(image~=0)=1, and you will have a black and white image of only 1s and 0s.

You can use bwconncomp after the above thresholding. It will give a list of every individual object and a list of each objects pixels.