Edge Localized Image Sharpening via Reassignment with Application to Computed Tomography
Dorney, Timothy D.
Baraniuk, Richard G.
Image enhancement; edge sharpening; computed tomography; wavelets; reassignment
Traditional 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.