A Watermarking Algorithm Based on Energy Estimation and Human Visual System Model
Yanlong Wang · Telecommunication Engineering · 2005
In this paper, the watermarking framework for energy estimation is extended to block-based Discrete Cosin Tranform (DCT) field. A watermarking algorithm based on the block-based DCT is presented, and the watermarking energy can be determined from the given Power Signal-to-Noise Ratio(PSNR). The algorithm, inserting the watermarking into the low and then middle frequency field of DCT coefficient based on Human Visual System (HVS) model, tries to get a good trade-off between imperceptibility and robustness. It also gives a re-embedding and correspond detecting method, which makes it can resist against various attacks. The result of experiment shows that the algorithm does get a good trade-off between imperceptibility and robustness.