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Edge Localized Image Sharpening via Reassignment with Application to Computed Tomography

By Timothy D. Dorney, Srikrishna Bhashyam, Andrew Doran, Hyeokho Choi, Patrick Flandrin and Richard G. BaraniukTimothy D. Dorney, Srikrishna Bhashyam, Andrew Doran, Hyeokho Choi, Patrick Flandrin and Richard G. Baraniuk

Abstract

Conference PaperTraditional filtering methods operate on the entire signal or image. In some applications, however, errors are concentrated in specific regions or features. A prime example is images generated using computed tomography. Practical implementations limit the amount of high frequency content in the reconstructed image, and consequently, edges are blurred. We introduce a new post-reconstruction edge enhancement algorithm, based on the reassignment principle and wavelets, that localizes its sharpening exclusively to edge features. Our method enhances edges without disturbing the low frequency textural details.Defense Advanced Research Projects AgencyArmy Research OfficeNational Science Foundatio

Topics: Image enhancement, edge sharpening, computed tomography, wavelets, reassignment, Image enhancement, edge sharpening, computed tomography, wavelets, reassignment
Year: 2006
DOI identifier: 10.1117/12.402443
OAI identifier: oai:scholarship.rice.edu:1911/19860
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