Fully automated breast boundary and pectoral muscle segmentation in mammograms.

•Edge’s information eccentricity and extent are important for pectoral detection.•Characteristics of edge’s noise: ‘half bull nose’, ‘full bull nose’ and ‘horizontal’.•A completed 2D breast model for breast boundary and pectoral muscle segmentation.•We showed the use of ACWE model is more accurate compared to ACE.•Entropy information to enhance the visibility along the skin line boundary.