Abstract: Method and system for determining skinline in digital mammogram images. The method includes smoothening a digital mammogram image to yield a smoothened image. The method also includes determining gradient in the digital mammogram image to yield a gradient map. Further, the method includes extracting breast region from the digital mammogram image based on the smoothened image and the gradient map using fuzzy rule based pixel classification to yield a binary image. Moreover, the method includes filtering the binary image to remove noise and to yield a filtered image. The method also includes extracting boundary of the breast region in the filtered image. Furthermore, the method includes detecting the skinline based on the boundary of the breast region.