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Mathematical Problems in Engineering - Volume 2014 2014, Article ID 350753, 9 pages -

Research Article

Department of Computer Science and Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan

Department of Information Management, Chaoyang University of Technology, Taichung City 41349, Taiwan

Department of Computer and Communication, Shu-Te University, Kaohsiung 82445, Taiwan

Received 18 March 2014; Accepted 13 August 2014; Published 28 August 2014

Academic Editor: Sabri Arik

Copyright © 2014 Chun-Hung Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We describe an authentication and recovery scheme for color image protection based on adaptive encoding. The image blocks are categorized based on their contents and different encoding schemes are applied according to their types. Such adaptive encoding results in better image quality and more robust image authentication. The approximations of the luminance and chromatic channels are carefully calculated, and for the purpose of reducing the data size, differential coding is used to encode the channels with variable size according to the characteristic of the block. The recovery data which represents the approximation and the detail of the image is embedded for data protection. The necessary data is well protected by using error correcting coding and duplication. The experimental results demonstrate that our technique is able to identify and localize image tampering, while preserving high quality for both watermarked and recovered images.

Autor: Chun-Hung Chen, Yuan-Liang Tang, and Wen-Shyong Hsieh



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