【摘要】 从嵌入、提取两方面对水印技术加以改进,提出了数字水印的重复嵌入算法,即将一位水印信息多次重复嵌入到原始图像DCT系数的直流、中频和低频系数中。提取水印时,不是简单的求多个提取值平均值,而是采用一种自学习的提取方法,更好满足了水印的要求。更多还原

【Abstract】 A watermark algorithm was improved in embedding and extracting. One watermark pixel was embedded many times into DC, mid-frequency and low-frequency coefficients of the same DCT block. What it dose was not averaging watermark values extracted from one block, but applied a self-studying method to get the last watermark. The watermark system is more preferable.更多还原