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INTEGRITY AUTHENTICATION METHOD FOR JPEG IMAGES
USING REVERSIBLE WATERMARKING
Hyun-Wu Jo, Dong-Gyu Yeo and Hae-Yeoun Lee
Dept. of Computer Software Engineering, Kumoh National Institute of Technology,
Sanho-ro 77, Gumi, Gyeongbuk 730-701, Korea
Keywords: Image Authentication, JPEG Compression, Reversible Watermark, DCT Coefficient.
Abstract: In these days, with increasing the importance of multimedia security, various multimedia security
techniques are studied. In this paper, we propose a content authentication algorithm based on reversible
watermarking which supports JPEG compression commonly used for multimedia contents. After splitting
image blocks, a specific authentication code for each block is extracted and embedded into the quantized
coefficients on JPEG compression which are preserved against lossy processing. At a decoding process, the
watermarked JPEG image is authenticated by extracting the embedded code and restored to have the
original image quality. To evaluate the performance of the proposed algorithm, we analyzed image quality
and compression ratio on various test images. The average PSNR value and compression ratio of the
watermarked JPEG image were 33.13dB and 90.65%, respectively, whose difference with the standard
JPEG compression were 2.44dB and 1.62%.
1 INTRODUCTION
Multimedia contents can be copied and manipulated
without quality degradation. Therefore, they are
vulnerable to digital forgery and illegal distribution.
In these days, with increasing the importance of
multimedia security, various multi-media security
techniques are studied.
Digital watermarking can be an efficient solution
to protect multimedia security and digital right
management, which inserts confidential information
called as the watermark into multimedia contents
themselves. By retrieving the inserted watermark
from the contents, it can be used for various
purposes including ownership verification, copyright
protection, broadcast monitoring, and contents
authentication, etc.
In this paper, we propose a content authentica-
tion algorithm based on reversible watermarking
which supports JPEG compression commonly used
for multimedia contents. After splitting image
blocks, a specific authentication code for each block
is ex-tracted and embedded into the quantized
coefficients on JPEG compression. At a decoding
process, the watermarked JPEG image is
authenticated by ex-tracting the embedded code and
restored to have the original image quality.
The paper is composed of as follows. In Sec. 2,
related researches are summarized. We present im-
age authentication algorithm for JPEG compression
in Sec. 3. Experimental results are shown in Sec. 4
and Sec. 5 concludes.
2 RELATED WORKS
The purpose of image authentication is to detect
tempering and to prove the integrity of the image. In
the various types of watermarking algorithms,
fragile watermarking is easily corrupted by slightest
modification and applicable for this purpose.
Yuan and Zhang proposed a fragile watermark-
ing method for image authentication based on statis-
tical analysis in the wavelet (Yuan, 2003). Hu and
Han suggested a semi-fragile watermarking algo-
rithm for image authentication (Hu, 2005), in which
image features are extracted from the low frequency
domain to generate two watermarks. One feature is
used to classify the intentional content modification
and the other is used to indicate the modified loca-
tion. A compressed-domain fragile watermarking
scheme with discrimination of tampers on image
content or watermark was studied (Wang, 2009).
Li proposed a transform-domain fragile
83
Jo H., Yeo D. and Lee H..
INTEGRITY AUTHENTICATION METHOD FOR JPEG IMAGES USING REVERSIBLE WATERMARKING.
DOI: 10.5220/0003826200830086
In Proceedings of the International Conference on Computer Vision Theory and Applications (VISAPP-2012), pages 83-86
ISBN: 978-989-8565-04-4
Copyright
c
2012 SCITEPRESS (Science and Technology Publications, Lda.)