关键词: 数字水印, 容量理论, n维空间, 最优编码

Abstract: The status in quo of capacity theory research of watermarking system is simply reviewed. It is thought as maximum reliable transfer rate of communication model that watermark capacity is researched in fixed channel while carrier is presented. Two scenarios are deeply analyzed with attack behavior or not. Under conditions with embedding and attacking restriction in Euclidean measurement, the relationship between quantity division of n-dimensions nodes and watermark capacity is obtained. The capacity upon threshold can be calculating. At last, the relationship is analyzed between watermark extraction error rate and watermark capacity in attacking scenario.

Key words: digital watermark, capacity theory, n-dimensions space, optimum coding