how can I find withe dots in image?

I have some mammography images and exist white spots in some of them. I want to extract this spots. do you have any suggestion?please help me. thank you.

[nadia]

no one can guide me?

[Xiaoli]

I was thinking that maybe the intensity of the whiteness of the spot might be in a different range from the rest of the image. Use the imtool or impixelinfo to see the intensity of the whiteness of the spot. In a grayscale image 0 is black and 1 is white. That spot looks pretty white. So for example;

a=imread('imagename.tiff')

b=mat2gray%if not already a grayimage

imtool(b)%scroll to view the intensity of the white spot

level=# %depending on the intensity of the dot

im2bw(b,level)

so for example, if the intensity of the spot is 0.9, by converting to binary and choosing a level of lets say 0.88, all the pixel value below 0.88 will be turned to black and the ones above will be white. See if that helps you!