Author : Hakeem Aejaz Aslam 1
Date of Publication :8th March 2017
Abstract: In this paper, the use of different enhancement techniques to increase the contrast of the mammogram is presented. By far, the best method to come up with is the Laplacian pyramid method. In this method, the original image is convolved with a Gaussian kernel which is a low pass filtering operation with the band limit reduced correspondingly by one octave with each level. The Laplacian Pyramid differentiates smoothed brightness values and produces a set of band pass filtered copies of the original image. The Laplacian pyramid with level 5 is presented in this paper. Then the reconstructed images are finally brought back the original image with increased contrast by subtracting the images of each level of the pyramid with the reconstructed images. It is shown that the visibility of micro calcification clusters and anatomic details is considerably improved in the processed images. The code of this algorithm is generated using MATLAB 7.5 software.
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