An Effective Authenticating Method On The Compressed Image Data

Author

Chen, Tsong-Yi ; Wang, Da-Jinn ; Chen, Thou-Ho ; Lee, Chung-Yih

Author_Institution

Dept. of Electron. Eng., Nat. Kaohsiung Univ. of Appl. Sci.

Volume

1

fYear

2006

fDate

Aug. 30 2006-Sept. 1 2006

Firstpage

249

Lastpage

252

Abstract

In this paper, we propose an effective watermarking method dedicated to authenticating the compressed image data. By exploiting the characteristics of JPEG compressed data, we compare the quantized with the non-quantized DCT coefficients for finding the embedding positions. A block-classification strategy is used for classifying 8 times 8 DCT blocks into key-blocks and flat-blocks in order to hide different watermarks into the positions mentioned above. Experimental results show that the efficacy of the proposed approach for JPEG images with about 75% to 90% compression ratio and the watermarked image still maintains a PSNR over 37dB, and only a slight overhead in bit-streams is introduced

Keywords

data compression; discrete cosine transforms; image coding; message authentication; watermarking; JPEG compressed image data authentication method; block-classification strategy; quantized DCT coefficients; watermarking method; Authentication; Data encapsulation; Data engineering; Discrete cosine transforms; Image coding; Information management; PSNR; Quantization; Transform coding; Watermarking;

fLanguage

English

Publisher

ieee

Conference_Titel

Innovative Computing, Information and Control, 2006. ICICIC '06. First International Conference on

Conference_Location

Beijing

Print_ISBN

0-7695-2616-0

Type

conf

DOI

10.1109/ICICIC.2006.43

Filename

1691787