Watermark embedding method based on DCT subband image...

Details Watermark embedding method based on DCT subband image... Watermark embedding method based on DCT subband image...

2007-03-27

2007-03-27

Mancuso, Joseph (Department: 2624)

Image analysis

Applications

C382S250000

Reexamination Certificate

active

10700549

ABSTRACT:
A watermark embedding method based on DCT subband image characters is disclosed. An original image is converted into a frequency image using a discrete cosine transformation. The watermark information is then embedded into a specific embedding block in each macro-block of the frequency image. The method has the following advantages: (1) the image embedded by watermark is resistant from distortion and damages from compressions; (2) the watermark image can be extracted without employing the original image; and (3) the quality of the image embedded with the watermark image can remain intact.

REFERENCES:
patent: 6285775 (2001-09-01), Wu et al.
Iamge Refining Technique using Digital Watermarking, Chuan-Fu Wu and Wen-Shyong Hsieh, Taiwan,Oct. 6, 1999,IEEE 2000.
Robust Image Watermarking Based on Hybrid Transformation, der-Chyuan Lou and Chia-Hung Sung, Taiwan, IEEE 2003.
DCT-Domain Watermarking Technique for still Images: Detector Performance Analysis and a New Structure, Juan R.Hernandez,IEEE 2000.

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