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There are many possible modifications, for example, lossy compression of the data (in which resolution is diminished), cropping an image or video, or intentionally adding noise. Detection (often called extraction) is an algorithm that is applied to the attacked signal to attempt to extract the watermark from it.
While video fingerprinting systems must search a potentially large database of reference fingerprints, a watermark detection system only has to do the computation to detect the watermark. This computation can be significant and when multiple watermark keys must be tested, then watermarking can fail to scale to the volumes required by commercial ...
It is a shaded watermark first used in 1848 that incorporates tonal depth and creates a greyscale image. Instead of using a wire covering for the dandy roll, the shaded watermark is created by areas of relief on the roll's own surface. Once dry, the paper may then be rolled again to produce a watermark of even thickness but with varying density.
They are thus a form of permanent visual station identification, increasing brand recognition and asserting ownership of the video signal. The graphic identifies the source of programming, even if it has been time-shifted—that is, recorded to videotape, DVD, or a digital personal video recorder such as TiVo. Many of these technologies allow ...
Digital watermarking, a technique to embed data in digital audio, images or video . Audio watermark, techniques for embedding hidden information into audio signals; Watermark (data file), a method for ensuring data integrity which combines aspects of data hashing and digital watermarking
The latest versions also capture overlay video and can re-record movies and video clips (e.g. recording videos playing in Windows Media Player, RealVideo, QuickTime, etc.). Beginning with version 3.0, HyperCam also includes a built-in editor for trimming and merging captured AVI, WMV, ASF files. [2] Unregistered HyperCam 2's watermark