SELECTION OF BLOCKS IN A VIDEO STREAM FOR EMBEDDING DIGITAL WATERMARKS
Sergey Victorovich Belim, P.G. Cherepanov · Matematičeskie struktury i modelirovanie · 2018
The article proposes a method for selecting blocks for embedding digital watermarks in video files. The video stream is represented as a three-dimensional object. For embedding digital watermarks, the Koch-Zhao method is used, which is generalized to the three-dimensional case. The main goal of the proposed method is to reduce visible distortions from embedding data. For the selection of blocks, their statistical analysis is performed. The variance of the color intensity of individual pixels is chosen as the main parameter. A computer experiment is conducted. To assess the level of visibility, the ratio of noise to the main signal is calculated. The threshold value of the variance above which the embedding is the least noticeable is experimentally determined.