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Adaptive Contrast Enhancement in DCT Domain  

Jeon, Yong-Joon (Department of Electrical & Eloectronics Engineering, Yonsei University)
Eom, Min-Young (Department of Electrical & Eloectronics Engineering, Yonsei University)
Choe, Yoon-Sik (Department of Electrical & Eloectronics Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.42, no.5, 2005 , pp. 73-78 More about this Journal
Abstract
Images coded by DCT based compression contain several quality degradations by quantization process. Among them contrast distortion is the important one because human eyes are sensitive to contrast. In case of low bit-rate coded image, we can not get an image having good quality due to quantization error. In this paper, we suggest a new scheme to enhance image's contrast in DCT domain. Proposed method enhances only edge regions. Homogeneous regions are not considered in this method. $8{\times}8$ DCT coefficient blocks are decomposed to $4{\times}4$ sub-blocks for detail edge region discrimination. we could apply this scheme to real-time application because proposed scheme is DCT based method.
Keywords
Contrast Enhancement; Discrete Cosine Transform (DCT); DCT domain; JPEG;
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  • Reference
1 Yung-Kai Lai and C.-C Jay Kuo, 'A Harr Wavelet Approach to Compressed Image Quality Measurement', Journal of Visual Communication and Image Representation 11, 17-40, 2000   DOI   ScienceOn
2 E. Peli, 'Contrast in complex images', J.Opt. Soc, Amer, A, vol.7, pp 2032-2040, 1990   DOI
3 Jinshan Tang and Eli Peli, 'Image Enhancement in JPEG Domain for Low-Vision Patients', SID 2002
4 Bo Shen and Ishwar K. Sethi, 'Direct feature extraction from compressed images', in IS&T SPIE: Storage and Retrieval for Image and Video Databases IV, vol. 1995-1996, CA, pp.33-49   DOI
5 Jianmin Jiang and Guocan Feng, 'The Spatial Relationship of DCT Coefficients Between a Block and Its Sub-blocks', Signal Processing, IEEE Trans on Vol.50, Issue:5, May 2002, pp.1160 - 1169   DOI   ScienceOn
6 Jinshan Tang, Eli Peli, and Scott Acton, 'Image Enhancement Using a Contrast Measure in the Compressed Domain', Signal Processing Letters, IEEE , Vol.10, Issue:10, Oct. 2003 pp. 289 - 292   DOI   ScienceOn