| Presentation | 2009/1/5 QUALITY IMPROVEMENT OF COMPRESSED COLOR IMAGES USING A PROBABILISTIC APPROACH(International Workshop on Advanced Image Technology 2009) Nobuteru Takao, Shun Haraguchi, Hideki Noda, Michiharu Niimi, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In compressed color images, colors are usually represented by luminance and chrominance(YCbCr) components. Considering characteristics of human vision system, chrominance(CbCr) components are generally represented more coarsely than luminance component. Aiming at possible recovery of chrominance components, we propose a modelbased chrominance estimation algorithm where color images are modeled by a Markov random field(MRF). A simple MRF model is here used whose local conditional probability density function(pdf) for a color vector of a pixel is a Gaussian pdf depending on color vectors of its neighboring pixels. Chrominance components of a pixel are estimated by maximizing the conditional pdf given its luminance component and its neighboring color vectors. Experimental results show that the proposed chrominance estimation algorithm is effective for quality improvement of compressed color images such as JPEG and JPEG2000. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | compressed color image / chrominance estimation / MRF / JPEG / JPEG2000 |
| Paper # | IE2008-153 |
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| Conference Information | |
| Committee | IE |
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| Conference Date | 2009/1/5(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
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| Paper Information | |
| Registration To | Image Engineering (IE) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | QUALITY IMPROVEMENT OF COMPRESSED COLOR IMAGES USING A PROBABILISTIC APPROACH(International Workshop on Advanced Image Technology 2009) |
| Sub Title (in English) | |
| Keyword(1) | compressed color image |
| Keyword(2) | chrominance estimation |
| Keyword(3) | MRF |
| Keyword(4) | JPEG |
| Keyword(5) | JPEG2000 |
| 1st Author's Name | Nobuteru Takao |
| 1st Author's Affiliation | Kyushu Institute of Technology, Dept. of Systems Design and Informatics() |
| 2nd Author's Name | Shun Haraguchi |
| 2nd Author's Affiliation | Kyushu Institute of Technology, Dept. of Systems Design and Informatics |
| 3rd Author's Name | Hideki Noda |
| 3rd Author's Affiliation | Kyushu Institute of Technology, Dept. of Systems Design and Informatics |
| 4th Author's Name | Michiharu Niimi |
| 4th Author's Affiliation | Kyushu Institute of Technology, Dept. of Systems Design and Informatics |
| Date | 2009/1/5 |
| Paper # | IE2008-153 |
| Volume (vol) | vol.108 |
| Number (no) | 373 |
| Page | pp.pp.- |
| #Pages | 5 |
| Date of Issue | |