Early Stage Detection of Tumors in Mammograms
نویسندگان
چکیده
This paper presents a method for detecting tumors in breast. The tumors detected are circular in shape. The method used for detecting tumor is pixel-based mass detection. It uses template-matching procedure. These templates are defined according to the shape, and brightness of the tumor masses. Prior to template matching, median filtering enhances the mammogram images. High pass filtering enhances the edges and then edge detection is used to detect the shape of the tumor. Only circular shaped tumors are detected, which are also the early stage tumors, in case, the tumor is malignant. In the template matching, the threshold is set for the calculated values of the cross-correlation. Then the percentile method is used to set a global threshold for each film. It is shown that,this method of template matching for detecting early stage tumors gives substantially better detection results. A large number of digitized mammogram images were used for evaluation of this method. The results obtained by applying these techniques to a set of test images are described further. Images Courtesy: Siddhivinayak Cancer Hosp. Miraj, Maharashtra.
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