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An effective and flexible image enhancement algorithm in compressed domain

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Abstract

Images with JPEG format using discrete cosine transform (DCT) is selected for most popular compression standards. Enhancement in the compressed domain offers two major advantages, including low computational complexity and storage space. However, the compression is achieved by block-based transform; therefore, it is hard to enhance image globally. In this paper, the main issue is to develop a global enhancement method that effectively reduces the introduced blocking artifacts and achieves excellent visual quality of enhancement. We propose a combined DCT matrix representation, which consists of 8n × 8n pixel arrays, to enhance the global information on images for removing block artifacts in compressed-domain. In addition, we propose the multi-enhancement factors based on spatial frequency for image enhancement in compressed domain. From the simulation results, the proposed method achieves not only excellent improvement for image enhancement but also reducing the blocking artifacts significantly.

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Acknowledgments

This work was supported by the National Science Counsel Granted NSC 102-2221-E-214 -034 -MY2

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Authors and Affiliations

  1. Department of Information Engineering, I-Shou University, Tahsu, 840, Kaohsiung, Taiwan, Republic of China

    Chung-Ming Kuo, Nai-Chung Yang, Chih-Shan Liu, Pi-Yun Tseng & Chi-Kao Chang

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  1. Chung-Ming Kuo
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  2. Nai-Chung Yang
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  3. Chih-Shan Liu
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  4. Pi-Yun Tseng
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  5. Chi-Kao Chang
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Correspondence to Chung-Ming Kuo.

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Kuo, CM., Yang, NC., Liu, CS. et al. An effective and flexible image enhancement algorithm in compressed domain. Multimed Tools Appl 75, 1177–1200 (2016). https://doi.org/10.1007/s11042-014-2363-x

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  • DOI: https://doi.org/10.1007/s11042-014-2363-x

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