Patent ID: 8094871

Claim:
A video watermark detection apparatus for detecting a watermark that is watermarked by a video watermarking apparatus, the video watermark detection apparatus comprising: a parameter extractor for receiving compressed digital video and for providing spatial information of an image of the compressed digital video; a bit stream grouping unit for grouping the received compressed digital video based on the spatial information of the image of the compressed digital video; a spatial domain classifier for receiving a decoded digital video derived from the compressed digital video and for classifying spatial domain data of an image of the decoded digital video; a watermark detector for extracting a watermark bit inserted for each of a plurality of domains from data of each domain; and a memory for storing the extracted watermark bit, wherein a first watermark bit is extracted based on a first sign determined by the video watermarking apparatus and a second watermark bit is extracted based on a second sign determined by the video watermarking apparatus.