| 摘要 |
A video communication unit ( 405 ) includes a video input ( 415 ) for receiving an un-watermarked video or image signal transmission having a number of video or image frames ( 110, 120, 130, 140 ), wherein each video or image frame includes a number of bit planes, the video input ( 415 ) being operably coupled to a processor ( 410 ). The processor ( 410 ) splits at least one bit plane ( 116 ) from each of at least two video or image frames ( 205, 210 ) into a first and second portion. The processor combines ( 235, 242,232,245 ) a second portion of the at least one bit plane of a first frame with a first portion of the at least one bit plane of a second frame to apply a watermark bit to the video or image signal transmission. A video communication system and methods of detecting a tampered area and visually labelling the tampered area are described. This enables fraudulent tampering of images and video to be detected, and the location of such tampering to be revealed to users of the material. |
