Non-linear polynomial filters for edge enhancement of mammogram lesions

•NPF framework serves to catalyze the computer aided analysis of mammograms.•It provides the radiologists with improved mammograms for precision in diagnosis.•An extension of NPF for sharpening and edge enhancement of mammograms is presented.•Integration of LIP model provides enhancement response in...

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Bibliographic Details
Published in:Computer methods and programs in biomedicine Vol. 129; pp. 125 - 134
Main Authors: Bhateja, Vikrant, Misra, Mukul, Urooj, Shabana
Format: Journal Article
Language:English
Published: Ireland Elsevier B.V 01.06.2016
Subjects:
Breast Neoplasms - diagnostic imaging
Breast Neoplasms - pathology
Edge enhancement
Female
Filtering
Filtration
Human Visual System (HVS)
Humans
Image Enhancement
Internal Medicine
Lesions
Logarithmic Image Processing (LIP)
Mammogram lesions
Mammography
Mathematical models
Non-linear polynomial filters (NPF)
Nonlinear Dynamics
Nonlinearity
Other
Polynomials
Sharpness
Signal to noise ratio
Logarithmic Image Processing (LIP)
Mammogram lesions
Edge enhancement
Human Visual System (HVS)
Non-linear polynomial filters (NPF)
ISSN:0169-2607, 1872-7565, 1872-7565
Online Access:Get full text
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Summary:•NPF framework serves to catalyze the computer aided analysis of mammograms.•It provides the radiologists with improved mammograms for precision in diagnosis.•An extension of NPF for sharpening and edge enhancement of mammograms is presented.•Integration of LIP model provides enhancement response in coherence to HVS.•The obtained results are evaluated using CII, PSNR & CEM as image quality metrics. Computer aided analysis of mammograms has been employed by radiologists as a vital tool to increase the precision in the diagnosis of breast cancer. The efficiency of such an analysis is dependent on the employed mammogram enhancement approach; as its major role is to yield a visually improved image for radiologists. Non-linear Polynomial Filtering (NPF) framework has been explored previously as a robust approach for contrast improvement of mammographic images. This paper presents the extension of NPF framework for sharpening and edge enhancement of mammogram lesions. Proposed NPF serves to provide enhancement of edges and sharpness of the lesion region (region-of-interest) in mammograms, in a manner to minimize the dependencies on pre-selected thresholds. In the present work, Logarithmic Image Processing (LIP) model has been employed for the purpose of improvement in visualization of mammograms based on Human Visual System (HVS) characteristics. The proposed NPF filtering framework yields mammograms with significant improvement in contrast, edges as well as sharpness of the lesion region. The performance of the proposed approach has been validated using state-of-art objective evaluation measures (of mammogram enhancement) like Contrast Improvement Index (CII), Peak Signal-to-Noise Ratio (PSNR), Average Signal-to-Noise Ratio (ASNR) and Combined Enhancement Measure (CEM); as well as subjective evaluation by radiologists’ opinions. The proposed NPF provides a robust solution to perform noise controlled contrast as well as edge enhancement using a single filtering model. This leads to a better visualization of the fine lesion details predictive of their severity. The applicability of single filtering methodology for carrying out denoising, contrast and edge enhancement improves the worth of the overall framework.
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ISSN:0169-2607
1872-7565
1872-7565
DOI:10.1016/j.cmpb.2016.01.007