Input complexity adaptive quantization watermarking

Details Input complexity adaptive quantization watermarking Input complexity adaptive quantization watermarking

2005-08-04

2009-11-17

Dang, Duy M (Department: 2624)

Image analysis

Applications

C382S251000

Reexamination Certificate

active

07620199

ABSTRACT:
Systems and methods are described that apply a watermark to data, such as data representing an image. In one implementation, the complexity of the image is measured. A quantization step size is calculated, based in part on the measured complexity of the image. A watermark or message is embedded into the image using the quantization step sizes derived for each coefficient of interest. In a further implementation, a mark decoding system is configured to extract the embedded message from the image data.

REFERENCES:
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patent: 7095873 (2006-08-01), Venkatesan et al.
patent: 7356161 (2008-04-01), Jain et al.
patent: 2002/0154778 (2002-10-01), Mihcak et al.
patent: 2004/0001605 (2004-01-01), Venkatesan et al.
Mihcak et al. (“Blind image watermarking via derivation and quantization of robust semi-global”, ICASSP, IEEE Published 2002, pp. 3453-3456.
Chen et al., “Quantization Index Modulation: A Class of Provably Good Methods for Digital Watermarking and Information Embedding”, IEEE, May 2001, vol. 47, No. 4, pp. 1423-1443.

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