Title :
A Digital Image Watermark Algorithm Based on DC Coefficients Quantization
Author :
Zhao, Yanling ; Zheng, Xiaoshi ; Li, Na ; Liu, Guangqi ; Wang, Qingxi
Author_Institution :
Shandong Comput. Sci. Center
Abstract :
Digital watermark technology is an efficient way to copyright protection. First, DCT coefficients characteristics were analyzed. Then, a new watermark technique quantization was proposed. According to watermark information, DC coefficients of each 8times8 block were modulated in DCT matrix. And an adaptive method was given to obtain quantization distance. The experiments show it does well in transparency and robustness. It can resist against JPEG compression, cut and common image attacks efficiently
Keywords :
copyright; discrete cosine transforms; image coding; vector quantisation; watermarking; JPEG compression; copyright protection; digital image watermark; discrete cosine coefficient quantization; discrete cosine transform matrix; watermark information; Computer science; Copyright protection; Digital images; Discrete cosine transforms; Image coding; Quantization; Resists; Robustness; Transform coding; Watermarking; DC coefficient; Discrete Cosine Transform (DCT); digital watermark; quantization;
Conference_Titel :
Intelligent Control and Automation, 2006. WCICA 2006. The Sixth World Congress on
Conference_Location :
Dalian
Print_ISBN :
1-4244-0332-4
DOI :
10.1109/WCICA.2006.1713894
