首页>
外国专利>
Scaling independent technique for watermarking images
Scaling independent technique for watermarking images
展开▼
机译:用于水印图像的比例缩放独立技术
展开▼
页面导航
摘要
著录项
相似文献
摘要
A robust technique to prevent illicit copying of video information notwithstanding the use of image scaling. A watermark is embedded into the video signal (e.g., DVD's content or other video sources) at different scales (i.e., sizes). The watermark is maintained at each scale for a predetermined time duration that is sufficient to allow the detector circuit in a DVD-recorder, DVHS recorder, DVCR, or any other digital format recorder to detect, extract, and process information contained in the watermark. At the end of the predetermined time duration, the watermark is changed to a different scale preferably on a pseudo-random basis to ensure that each one of all the scales in a predetermined scaling range is achieved a predetermined number of times.
展开▼