An Image Content-Based Bi-Watermarking with Adaptive Quantization
Han Na · Journal of Shantou University · 2007
A bi-watermarking algorithm with adaptive quantization is proposed based on DWT and image contents.In this algorithm,two watermarks are generated by extracting image feature from low frequency components.One watermark,for copyright protection,is embedded by block quantization with neighbor information,and another,for content authentication,is embedded by singular coefficient quantization.The quantization level is adaptively decided by texture features.It is shown in Experiments that the proposed bi-watermarking algorithm is good at copyright protection and content authentication simultaneously.