IEEE Trans Image Process - A generalized unsharp masking algorithm.

Tópicos

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Resumo

Enhancement of contrast and sharpness of an image is required in many applications. Unsharp masking is a classical tool for sharpness enhancement. We propose a generalized unsharp masking algorithm using the exploratory data model as a unified framework. The proposed algorithm is designed to address three issues: (1) simultaneously enhancing contrast and sharpness by means of individual treatment of the model component and the residual, (2) reducing the halo effect by means of an edge-preserving filter, and (3) solving the out-of-range problem by means of log-ratio and tangent operations. We also present a study of the properties of the log-ratio operations and reveal a new connection between the Bregman divergence and the generalized linear systems. This connection not only provides a novel insight into the geometrical property of such systems, but also opens a new pathway for system development. We present a new system called the tangent system which is based upon a specific Bregman divergence. Experimental results, which are comparable to recently published results, show that the proposed algorithm is able to significantly improve the contrast and sharpness of an image. In the proposed algorithm, the user can adjust the two parameters controlling the contrast and sharpness to produce the desired results. This makes the proposed algorithm practically useful.

Resumo Limpo

enhanc contrast sharp imag requir mani applic unsharp mask classic tool sharp enhanc propos general unsharp mask algorithm use exploratori data model unifi framework propos algorithm design address three issu simultan enhanc contrast sharp mean individu treatment model compon residu reduc halo effect mean edgepreserv filter solv outofrang problem mean logratio tangent oper also present studi properti logratio oper reveal new connect bregman diverg general linear system connect provid novel insight geometr properti system also open new pathway system develop present new system call tangent system base upon specif bregman diverg experiment result compar recent publish result show propos algorithm abl signific improv contrast sharp imag propos algorithm user can adjust two paramet control contrast sharp produc desir result make propos algorithm practic use

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