| Novel Efficient De-blocking Method for Highly Compressed Images |
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| 作者姓名： | SHI Min YI Qing-ming YANG Liang |
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| 作者单位： | Department of Electronic Engineering, Jinan University, Guangzhou 510632, CHN |
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| 基金项目： | 广东省重大科技专项基金，济南大学启动项目，Soft Science Project of Guangdong Province |
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| 摘 要： | Due to coarse quantization, block-based discrete cosine transform（BDCT） compression methods usually suffer from visible blocking artifacts at the block boundaries. A novel efficient deblocking method in DCT domain is proposed. A specific criterion for edge detection is given, one-dimensional DCT is applied on each row of the adjacent blocks and the shifted block in smooth region, and the transform coefficients of the shifted block are modified by weighting the average of three coefficients of the block. Mean square difference of slope criterion is used to judge the efficiency of the proposed algorithm. Simulation results show that the new method not only obtains satisfactory image quality, but also maintains high frequency information.
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| 关 键 词： | 高度压缩图象 块效应 去除方法 BDCT 离散余弦变换 |
| 文章编号： | 1007-0206（2007）02-0122-04 |
| 收稿时间： | 2006-12-10 |
| 修稿时间： | 2007-01-28 |
Novel Efficient De-blocking Method for Highly Compressed Images |
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| SHI Min YI Qing-ming YANG Liang.Novel Efficient De-blocking Method for Highly Compressed Images[J].Semiconductor Photonics and Technology,2007,13(2):122-125,145. |
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| Authors: | SHI Min YI Qing-ming YANG Liang |
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| Abstract: | Due to coarse quantization,block-based discrete cosine transform(BDCT) compression methods usually suffer from visible blocking artifacts at the block boundaries.A novel efficient de-blocking method in DCT domain is proposed.A specific criterion for edge detection is given,one-dimensional DCT is applied on each row of the adjacent blocks and the shifted block in smooth region,and the transform coefficients of the shifted block are modified by weighting the average of three coefficients of the block.Mean square difference of slope criterion is used to judge the efficiency of the proposed algorithm.Simulation results show that the new method not only obtains satisfactory image quality,but also maintains high frequency information. |
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| Keywords: | block-based discrete cosine transform(BDCT) blocking artifacts image compression |
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