Semiautomated Feature Interactive Thresholding

To provide a more quantitative estimate of mammographically dense tissue in the breast, an observer-assisted interactive thresholding technique can be used. This technique can easily be applied to a digital representation of the mammogram and does not rely on the absolute optical densities in the image, but instead on the observer's familiarity with the relatively simple anatomical features displayed on the mammogram.

In the digitized image, the brightness of each picture element (pixel) is represented by a gray-level value, i, where

i = INT

r (d -

d0 )

_(Dmax

0 0

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