Breast cancer is one of the prime causes of death in women. Early detection may help to improve the survival rate to a great extent. Mammography is considered as one of the most reliable methods to prescreen of breast cancer. However, reading the mammograms by radiologists is laborious, taxing, and prone to intra/inter observer variability errors. Computer Aided Diagnosis (CAD) helps to obtain fast, consistent and reliable diagnosis. This paper presents an automated classification of normal, benign and malignant breast cancer using digitized mammogram images. The proposed method used Gabor wavelet for feature extraction and Locality Sensitive Discriminant Analysis (LSDA) for data reduction. The reduced features are ranked using their F-values and fed to Decision Tree (DT), Linear Discriminant Analysis (LDA) and Quadratic Discriminant Analysis (QDA), k-Nearest Neighbor (k-NN), Naïve Bayes Classifier (NBC), Probabilistic Neural Network (PNN), Support Vector Machine (SVM), AdaBoost and Fuzzy Sugeno (FSC) classifiers one by one to select the highest performing classifier using minimum number of features. The proposed method is evaluated using 690 mammogram images taken from a benchmarked Digital Database for Screening Mammography (DDSM) dataset. Our developed method has achieved mean accuracy, sensitivity, specificity of 98.69%, 99.34% and 98.26% respectively for k-NN classifier using eight features with 10-fold cross validation. This system can be employed in hospitals and polyclinics to aid the clinicians to cross verify their manual diagnosis.
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