COPYRIGHT PROTECTION OF NAUTICAL CHART BASED ON DIGITAL
WATERMARK: TECHNIQUE, MODEL AND APPLICATION IN CHINA
Z. Tian, G.-X. Chen, Y.-D. Zheng, F. Cheng, J. Guo
Dalian Naval Academy, Department of Hydrographic Surveying
and Charting, Dalian, China
garyt@163.com
The nautical chart production in China has
completed the shift from traditional manual pattern into the digital way, and
the digital chart is gradually advanced more and more applicable. This paper firstly introduced the present technical base of chart
production in China, then the current workflow of digital chart production, and
then discussed the technique, model and application of
copyright protection of digital chart. At the end, comments and suggestions
were offered for the development of digital chart production and its copyright
protection in future.
Nowadays the digital watermarking technology is
becoming a hot button issue in the field of copyright protection. Based on the similarity
between the characters of Human Visual System and that of Wavelet Transform,
the paper presents a new insight of digital watermarking algorithm. This scheme
implemented the course of watermark embedding by wavelet transform. It is
strongly robust without much impact on the origin image.