METHOD OF HIDDEN DATA TRANSFER IN VIDEO IMAGE Russian patent published in 2017 - IPC G06T1/00 H04L9/06 G06K9/00 

FIELD: information technology.

SUBSTANCE: invention relates to steganography and is aimed at arrangement of a channel for hidden transfer of additional information in a video image. Proposed is a method of hidden data transfer in a video image as per MPEG-2 standard based on replacing less significant bits of a video image frame with values of a two-dimensional nonlinear code combination containing the hidden information. Formation of the steganographic channel is started with embedded data processing including encoding and modulation with a pseudo-random signal, for which selected are nonlinear 2D Frank-Walsh signals and/or Frank-Krestenson signals. Simultaneously with formation of the stegosignal selected are frames for its embedding considering as suitable all I-frames, as well as B- and P-frames. Stegochannel data are embedded only in those DCT coefficients, which are located in the vicinity of the right diagonal of the DCT coefficients matrix recorded in a JPEG file and added with extra system information and with universal Huffman tables by modulo two addition of the DCT coefficient bits.

EFFECT: technical result is enabling minimization of distortion of the video image, which is being introduced in, while providing stego-resistance of the information transmission system.

1 cl, 7 dwg