Method and apparatus for copy-once watermark for video recording
    2.
    发明授权
    Method and apparatus for copy-once watermark for video recording 有权
    用于视频录制的复制一次水印的方法和装置

    公开(公告)号:US06374036B1

    公开(公告)日:2002-04-16

    申请号:US09164859

    申请日:1998-10-01

    IPC分类号: H04N591

    摘要: Method and apparatus for “copy-once” of a digital video signal uses a watermark in the video signal. The embedded watermark has two versions: one indicates copy-never and a second indicates copy-once, the difference being a single watermark bit. The watermark carries additional bits representing a digitized attribute (image characteristic) of a particular video frame of the video signal, for instance an average value of the amplitude of a video field. The frame whose attribute is carried in the watermark has a field (or frame) marker, which is a special signal located in the overscan portion of the frame. A compliant video recorder verifies the watermark and the copy-once bit, extracts the associated attribute from the watermark, and compares it to the measured attribute of the marked video frame. Only if the extracted attribute value and the measured attribute value match is recording enabled. During the recording process, the frame markers are stripped, preventing second generation copies of the recorded video signal, and the copy-once bit is set to copy-never.

    摘要翻译: 数字视频信号“复制一次”的方法和装置在视频信号中使用水印。 嵌入水印有两个版本:一个表示从未复制,另一个表示复制一次,差别是单个水印位。 水印承载表示视频信号的特定视频帧的数字化属性(图像特性)的附加位,例如视频场的幅度的平均值。 属性在水印中携带的帧具有位于帧的过扫描部分中的特殊信号的场(或帧)标记。 兼容视频记录器验证水印和一次复制位,从水印中提取相关联的属性,并将其与标记的视频帧的测量属性进行比较。 只有提取的属性值和测量的属性值匹配才能启用记录。 在记录过程中,帧标记被剥离,防止记录的视频信号的第二代副本,并且一次复制位被设置为从不复制。