Abstract
Breast cancer is formed in breast cells and it occurs primarily in women. Mammogram is x-ray of the breast that provides structural details. In the proposed work, attempt has been made to discriminate normal and abnormal mammograms belonging to fatty, fatty-glandular or dense-glandular breast tissue density. Breast x-ray images acquired in Medio-Lateral-Oblique (MLO) view (n = 197) chosen from mini-MIAS database are preprocessed using median filter to remove noise and adaptive histogram equalization has been applied to improve image contrast. The preprocessed images are subjected to Pectoral Muscle Removal (PMR) algorithm to obtain Region of Interest (RoI) comprising of only breast tissue region. For the obtained RoI, Gabor filtering has been employed at 5 various scales and 8 orientations leading to (5 \(\times \) 8) 40 filter responses. Magnitude, phase information and statistical features such as energy, entropy, variance, kurtosis and skewness are computed for the obtained filter responses. In the next step, reduced feature set is obtained by implementing two schemes. In scheme1, the dominant scale and orientations of Gabor filter responses are determined by employing Kernel Principal Component Analysis (KPCA) and features are considered for the obtained dominant scale and orientation coefficients. Further, absolute difference value of extracted features are computed and compared to choose the significant features. In scheme2, sequential forward selection algorithm is employed to obtain significant features that discriminates normal and abnormal subjects. The derived significant features belonging to each category of breast density are fed to Least Square-Support Vector Machine (LS-SVM) and Random Forest (RF) classifier to classify subjects as normal and abnormal. The results indicate that it is possible to discriminate normal and abnormal subjects using Gabor and statistical features. LS-SVM classifier performs better with an accuracy of 93.54%, sensitivity of 95.24% and specificity of 90% for fatty-glandular tissues.
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Vijaya Madhavi, M., Christy Bobby, T. (2019). Gabor Filter Based Classification of Mammography Images Using LS-SVM and Random Forest Classifier. In: Santosh, K., Hegadi, R. (eds) Recent Trends in Image Processing and Pattern Recognition. RTIP2R 2018. Communications in Computer and Information Science, vol 1036. Springer, Singapore. https://doi.org/10.1007/978-981-13-9184-2_6
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