Motion vector-based video watermark embedding and extracting method

• Main Authors: QIAN YANGCHUN, GUO BAOAN, YU NENGHAI, YE SONG, PING QIANG, ZHUANG LIANSHENG, YU ZHIQIANG, ZHANG BIAO
• Format: Patent
• Language: Chinese; English
• Published: 18.05.2011
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

The invention discloses a motion vector-based video watermark embedding and extracting method. The method comprises the following watermark embedding steps of: a, during coding, acquiring ith motion vector (Xi, Yi) of a video frame of a coding end; b, acquiring the characteristic vector (V1i, V2i) of the motion vector (Xi, Yi) of the coding end according to the combination relationship of decimal parts of the transverse coordinate Xi and the longitudinal coordinate Yi of the motion vector (Xi, Yi) of the coding end; c, adjusting the transverse coordinate Xi or the longitudinal coordinate Yi of the motion vector (Xi, Yi) of the coding end according to the modification rule so that the transverse coordinate V1i and the longitudinal coordinate V2i of the characteristic vector (V1i, V2i) of the motion vector of the coding end are as same as Wk and Wk+1 of two watermarks to be embedded; the method comprises the following watermark extracting steps of: d, during decoding, acquiring ith motion vector (Xi, Yi) of a v