| Autor: |
Tsuji, Hiroyuki, Tokumasu, Shinji, Takahashi, Hiroki, Nakajima, Masayuki |
| Předmět: |
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| Zdroj: |
Systems & Computers in Japan; 9/15/2007, Vol. 38 Issue 10, p34-45, 12p, 2 Black and White Photographs, 2 Diagrams, 1 Chart, 4 Graphs |
| Abstrakt: |
It is desirable for a prefilter used for low-bitrate video coding to have a nonlinear characteristic achieving reduction in the amount of data by smoothing, as well as preserving as much as possible of edges that are visually important. Thus, we conducted a basic study for formulating an edge-preserving smoothing filter using anisotropic diffusion. It is known that if the conventional anisotropic diffusion Perona–Malik (PMD) diffusion is used as a smoothing filter, there will be problems such as noise with large gradients remaining and excessive edge enhancement. In this paper, we determine the conditions that the edge-stopping function must satisfy to solve these problems and derive a concrete function according to those conditions. Also, we verify by numerical experiments that the above problems are solved by anisotropic diffusion with our proposed edge-stopping functions. Further, targeting application to a prefilter for low-bitrate video coding, bit count reduction effect of our proposed filter was tested to verify its effectiveness. © 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(10): 34–45, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.20566 [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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