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An Improved DC Recovery Method from AC Coefficients of DCT-Transformed Images

Li, SJ, Ahmad, JJ, Saupe, D and Kuo, C-CJ (2010) An Improved DC Recovery Method from AC Coefficients of DCT-Transformed Images In: 17th IEEE International Conference on Image Processing (ICIP 2010), 2010-09-26 - 2010-09-29, Hong Kong, China.

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Motivated by the work of Uehara et al., an improved method to recover DC coefficients from AC coefficients of DCT-transformed images is investigated in this work, which finds applications in cryptanalysis of selective multimedia encryption. The proposed under/over-flow rate minimization (FRM) method employs an optimization process to get a statistically more accurate estimation of unknown DC coefficients, thus achieving a better recovery performance. It was shown by experimental results based on 200 test images that the proposed DC recovery method significantly improves the quality of most recovered images in terms of the PSNR values and several state-of-the-art objective image quality assessment (IQA) metrics such as SSIM and MS-SSIM.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Computing Science
Authors :
Li, SJ
Ahmad, JJ
Saupe, D
Kuo, C-CJ
Date : 2010
DOI : 10.1109/ICIP.2010.5653467
Contributors :
Related URLs :
Additional Information : © 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Depositing User : Symplectic Elements
Date Deposited : 24 Sep 2014 13:33
Last Modified : 31 Oct 2017 14:35

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