The Digital Fact Book - Quantel

Tracking (image)Following a defined point, or points, in the pictures of a clip. Initially this was performedby hand, using a DVE but was laborious, difficult and limited to only down to pixel accuracy.Now image tracking is widely used, thanks to the availability of automatic point trackingoperating to sub-pixel accuracy. The tracking data can be applied to control DVE picturemoving for such applications as removal of film weave, replacing 3D objects in movingvideo, wire removal, etc.Advanced multiple point tracking is sometimes used to analyze images in 3D, so allowinga whole raft of computer-generated material to be move-matched for compositing into livescenes – blurring the boundaries of live and synthetic imagery.See also: Corner pinning, Sub-pixelTriageSee: Digitizing timeTrue HDThis has no strict technical meaning but is marketing hype. The ATSC says that all HD,720P, 1080I and 1080P are all true HD, but the term has tended to be associated with1080P often in advertising – but this is nothing official. Not to be confused with... TrueHD.TrueHDDolby’s ‘next-generation’ lossless technology developed for high-definition disk-basedmedia (HD DVD and Blu-ray Disc). It includes ‘bit-for-bit’ lossless coding up to 18 Mb/sand support for up to eight channels of 24-bit, 96 kHz audio. It is supported by HDMI.Website: www.dolby.comT169