Device, method and digital video encoder for block-matching motion estimation
Au, Oscar C.
Liou, Ming L.
|Source||US Patent, 6,842,483 B1, 2005|
|Summary||Due to the huge size of raw digital video data, compression must be applied to video for transmission and storage. There are many popular international standards for video compression including ISO MPEG1, MPEG2, MPEG4, ITU-T H.261, H.263, H.263+, etc. These are already commonly used in video distribution such as in VCD, DVD, DVB, HDTV, video conferencing, video editing, video streaming over internet, etc. One common feature among these standards is that motion estimation is used to reduce temporal redundancy inherent in video sequences. It is well known that the exhaustive full search typically performed is very slow. It is highly desirable to develop fast motion estimation algorithms without significantly affecting the visual quality. This invention, the Advance Diamond Zonal Search(ADZS), is a fast motion estimation algorithm that can achieve an average speedup factor of 140, 450 and 900 compared with FS for search area sizes of +-16, +-32 and +-48 respectively with essentially the same video quality, both subjectively and in terms of PSNR. It relates generally to digital video compression, and more particularly to a video compression system using block-matching motion estimation and having both device and method aspects. It further relates to computer program products, such as a recording medium, carrying program instructions readable by a computing device to cause the computing device to carry out a method according to the invention.|
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