[IEEE 9th Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications (DICTA 2007) - Glenelg, Australia (2007.12.3-2007.12.5)] 9th Biennial Conference of the Australian Pattern Recognition Society on Digital Image Computing Techniques and Applications (DICTA 2007) - A New Contour Detection Approach in Mammogram Using Rational Wavelet Filtering and MRF Smoothing