A method of concealing data in an image or a video stream within a compression chain

摘要

A method of hiding data in an image or video stream within a compression chain. The invention relates to a method for concealing data in an image or a video stream within a compression chain, this method being implemented by computer and comprising the following steps: a phase of structuring and of processing during which at least one image is structured into blocks comprising coefficients, - a phase of transformation and quantization of the blocks so as to generate transformed and quantized coefficients, - entropy coding intended to encode the transformed and quantized coefficients . The method according to the invention further comprises a data concealment step during which bits of said data are concealed by modifying transformed and quantized coefficients located in a high frequency zone of at least part of said blocks which are relative to the luminance component of the video stream and which are coded in Intra. This modification is carried out after quantization but before entropy coding. Figure for the abstract: Fig. 1