By Chad Fogg, Didier J. LeGall, Joan L. Mitchell, William B. Pennebaker
This publication initiates a brand new electronic multimedia criteria sequence. the aim of the sequence is to make information regarding electronic multimedia criteria readilyavailable. either educational and complex issues could be coated within the sequence, usually in a single publication. Our wish is that clients will locate the sequence useful in determining what criteria to help and use whereas implementors will d- hide a wealth of technical info that aid them enforce these criteria effectively. In contemporary worldwide financial system criteria are more and more vital. but until eventually a regular is accepted, lots of the advantages of standardization aren't learned. we are hoping that criteria committee chairpeople will set up and inspire a e-book during this sequence dedicated to their new usual. it is a discussion board to proportion and look after a few ofthe “why” and “how” that went into the advance of the traditional and, within the technique, help in the quick adoption of the normal. Already in creation for this sequence are books titled electronic Video: - troduction to MPEG-2 and knowledge Compression in electronic Systems.
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Extra info for MPEG Video Compression Standard
This idealized decoder interprets the pack and packet headers, delivering the elementary bitstreams to the appropriate audio or video decoder. 1, a number audio and video decoders may be present. A major role of this idealized decoder is to prevent buffer overflow and underflow. , when the compression is too good. , when the encoding process produces too much data per picture. In the STD the bits for an access unit (a picture or an audio access unit) are removed from the buffer instantaneously at a time dictated by a decoding time stamp (DTS) in the bitstream.
A recent review article by Pan [Pan94] gives more details on MPEG audio coding. The book by Bhaskaran and Konstantinides [BK95] has reviews of many recent standards, including MPEG audio. 3 MPEG video MPEG video is specifically designed for compression of video sequences. A video sequence is simply a series of pictures taken at closely spaced intervals in time. Except for the special case of a scene change, these pictures tend to be quite similar from one to the next. Intuitively, a compression system ought to be able to take advantage of this similarity.
The 16×16 sample array of luminance samples is actually composed of four 8×8 blocks of samples, and these 8×8 blocks are the units of data that are fed to the compression models. The reason for this will become clearer in the discussion of the coding models. 4 Slice The MPEG picture is not simply an array of macroblocks, however. 7, it is composed of slices, where each slice is a contiguous sequence of macroblocks in raster scan order, starting at a specific address or position in the picture specified in the slice header.