PublicWatermarking Algorithm Based on the Polarity of DCT Coefficients

Authors:
Pengfei Yu;Bing Liu
Affiliations:
Yunnan University, China;Yunnan University, China
Venue:
ISDA '06 Proceedings of the Sixth International Conference on Intelligent Systems Design and Applications - Volume 02
Year:
2006

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Abstract

This paper present a novel blind watermarking algo- rithm based on the AC coefficients distribution properties of an image's DCT transform. This method uses the signs of the DCT coefficients to represent the bit 1 and 0 respec- tively. Furthermore, the parameters of this scheme can be calculated since we analyze the round off errors caused by storing a watermarked image. The experiment results show that the algorithm is effective and robust to common im- age processing operations, such as JPEG lossy compres- sion, cropping, lowpass filter and intensity transform.