Removing Excess White from Binary Image

Hello--

So I have a binary image and I only want to remove white from specified areas, such as the corners. (These areas being the circles). How would I do this???

I attached the image.

Regards,

Brian P

Answer 1

[Image Analyst]

Try thresholding then masking

mask = grayImage > 250; % or whatever intensity the spots are.
grayImage(mask) = 0; % blacken those pixels.

Answer 2

[Brian Peoples]

This image is not binary by the way, but i would use bwareaopen(BW,250) to do it