Frequency domain digital watermark algorithm implemented in spatial domain based on correlation coefficient and quadratic DCT transform

An approach of covert communication based on the Ethereum whisper protocol in blockchain

“…Digital watermarking 9 is one of the key technologies to realize the above applications. According to different algorithms and embedding domains, it can be divided into spatial domain watermark and transform domain watermark 10,11 . Spatial watermarking uses media such as the least significant bit (LSB) to load information directly on the data, while transform domain watermarking uses methods such as discrete cosine transform (DCT), 12 wavelet transform (WT), 13 discrete fourier transform (DFT), and other methods to transform the image, 14 which has better robustness than spatial watermarking.…”

A Semi-Fragile Video Watermarking Algorithm Based on H.264/AVC

“…To protect the copyright ownership of original videos or to provide the content authentication of original works has become an urgent problem to grapple with. As an effective method to resolve the problem of copyright protection and content authentication of multimedia, digital watermarking technology has become a research focus in the field of information security [6][7][8]. The basic idea of video watermarking is to add some extra information to the original video without affecting its visibility, which can provide the evidence of copyright or integrity authentication for the video content when necessary.…”