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提出了一种新的用于图像认证的半易损电子水印系统。水印方案采用基于小波变换的空间—频域分析方法,定义了一个小波系数量化函数,由该量化函数实现水印的产生、嵌入和提取。水印图像没有任何失真,因而可以通过改变量化参数实现水印的多级嵌入,进一步提高图像的认证能力。
A new semi-fragile electronic watermarking system for image authentication is proposed. Watermarking scheme uses the method of spatial-frequency domain analysis based on wavelet transform to define a wavelet coefficient quantization function, which is used to generate, embed and extract watermarks. Watermark image without any distortion, so you can change the quantization parameters to achieve multi-level watermark embedding to further improve the image authentication capabilities.