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Proceedings Paper

Digital watermarking of color image
Author(s): Shi-Cheng Chao; Hau-Ming Huang; Chi-Yao Chen
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Paper Abstract

An analytic method of embedding color watermarks into the color images is proposed. The original image is color image of size 480X640, and the watermark image is 24-bit-gray scale image of size 120X160. The quality variations of the embedded image and extracted watermark are analyzed. From the experimental results they appear that the quality of embedded image varies with the quantization index (QI). They also show that the quality of extracted watermark is dependent on the gray-level of the original image. The relationship between the gray-level and the noise of embedded image has been quantitatively analyzed. The digital quantization method is also important to decrease the noise of embedding image and the error of extracting watermark.

Paper Details

Date Published: 16 January 2006
PDF: 12 pages
Proc. SPIE 6058, Color Imaging XI: Processing, Hardcopy, and Applications, 605815 (16 January 2006); doi: 10.1117/12.642847
Show Author Affiliations
Shi-Cheng Chao, Ta Hwa Institute of Technology (Taiwan)
Hau-Ming Huang, Tung Nan Institute of Technology (Taiwan)
Chi-Yao Chen, Institute of Nuclear Energy Research AEC (Taiwan)

Published in SPIE Proceedings Vol. 6058:
Color Imaging XI: Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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