how can I find withe dots in image?

6 vues (au cours des 30 derniers jours)
nadia
nadia le 18 Oct 2016
Modifié(e) : Xiaoli le 19 Oct 2016
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.
  2 commentaires
nadia
nadia le 19 Oct 2016
no one can guide me?
Xiaoli
Xiaoli le 19 Oct 2016
Modifié(e) : Xiaoli le 19 Oct 2016
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!

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