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This paper proposes a new scheme of oblivious ghost-watermarking based on cepstral analysis and correlation techniques. First we formulate the signal of a composite image which consists of original and single-ghost components. Next we describe the definition of power cepstrum for the composite image. To improve the cepstral performance, we introduce a cepstral difference between composite and original images and examine its properties. After that, we explain two types of basic algorithms for the oblivious ghost-watermarking. The experimental results for some test images (M-sequence ghost images) show that the watermark information in each image can be detected sensitively by our scheme even when the ghost images are compressed.
Communications, Computers and signal Processing, 2003. PACRIM. 2003 IEEE Pacific Rim Conference on (Volume:2 )
Date of Conference: 28-30 Aug. 2003