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Data Hiding and Watermarking in JPEG Compressed Domain by DC Coefficient Modification

Authors Wong, Peter Hon Wah
Au, Oscar C L
Wong, Justy W C
Issue Date 2000
Source Proceedings of SPIE - The International Society for Optical Engineering , v. 3971, 2000, p. 237-244
Summary JPEG is a common image format in the WWW and can potentially be used to hide data for secure internet communication and watermark for copyright control. In this paper, we propose an algorithm to embed the secret or watermark information. The proposed algorithm, named Watermarking by DC Coefficients Modification (WDCM), assumes that the quality factor used in JPEG compression is known. We observe that it is perceptually undetectable if the DC coefficients in certain texture-rich blocks are modified by a small amount. We thus embed the secret information as a binary bit sequence in the quantized DC coefficients in those texture rich blocks. The watermark embedding process can be applied in compression domain without re-encode the data. The information bits are randomized by some pseudo-random noise (PN) sequences, the keys of which are needed for the decoding of the secret information. By embedding the information in the DC components, the proposed algorithm is robust to common JPEG compression if the quality factor is known.
Note Security and Watermarking of Multimedia Contents II; San Jose, CA, USA; 24 January 2000 through 26 January 2000; Code 56981
ISSN 0277-786X
ISBN 0819435899
Rights Copyright 2000 Society of Photo-Optical Instrumentation Engineers. This paper was published in Security and Watermarking of Multimedia Contents II, Ping Wah Wong; Edward J. Delp, Editors, Proceedings of SPIE Vol. 3971, p. 237-244 (2000) and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Language English
Format Conference paper
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