T-shaped video watermark embedding and extracting method

• Main Authors: XU JIAJIA, QIAN YANGCHUN, GUO BAOAN, YU NENGHAI, YE SONG, 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 relates to a T-shaped video watermark embedding and extracting method comprising a watermark embedding step and a watermark extracting step. The watermark embedding step includes: solving an encoding end motion velocity diagram according to a motion vector of a video frame during encoding; dividing the encoding end motion velocity diagram into a plurality of T-shaped partition areas to acquire the position of a central macro block Vij of the plurality of T-shaped partition areas; confirming an encoding end velocity comparative value J of each T-shaped partition area; and embedding a watermark sequence in the central macro block Vij. The watermark extracting step includes: solving a decoding end motion velocity diagram according to the motion velocity of the video frame during decoding; acquiring the position of the central macro block Vij of the plurality of T-shaped partition areas according to the decoding end motion velocity diagram; confirming the decoding end velocity comparative value J of