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Recovering Missing Coefficients in DCT-Transformed Images

Li, SJ, Karrenbauer, A, Saupe, D and Kuo, C-CJ (2011) Recovering Missing Coefficients in DCT-Transformed Images In: 2011 18th IEEE International Conference on Image Processing (ICIP 2011), 2011-09-11 - 2011-09-14, Brussels, Belgium.

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A general method for recovering missing DCT coefficients in DCT-transformed images is presented in this work. We model the DCT coefficients recovery problem as an optimization problem and recover all missing DCT coefficients via linear programming. The visual quality of the recovered image gradually decreases as the number of missing DCT coefficients increases. For some images, the quality is surprisingly good even when more than 10 most significant DCT coefficients are missing. When only the DC coefficient is missing, the proposed algorithm outperforms existing methods according to experimental results conducted on 200 test images. The proposed recovery method can be used for cryptanalysis of DCT based selective encryption schemes and other applications.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Authors :
Li, SJ
Karrenbauer, A
Saupe, D
Kuo, C-CJ
Date : 2011
DOI : 10.1109/ICIP.2011.6115738
Contributors :
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 14:42
Last Modified : 31 Oct 2017 14:35

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