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Chapter 12 provides knowledge of MPEG video. The main contents of this chapter include all of the following: Video compression, video compression: MPEG, compression standards, how to compress video? Simple motion example, estimating motion of blocks,. | CM3106 Chapter 12 MPEG Video Prof David Marshall dave.marshall@cs.cardiff.ac.uk and Dr Kirill Sidorov K.Sidorov@cs.cf.ac.uk www.facebook.com kirill.sidorov CARDIFF UNIVERSITY PRIFYSCOL CAERpv School of Computer Science Informatics Cardiff University UK Video Compression We need to compress video more so than audio images in practice since J Uncompressed video and audio data are huge. In HDTV the bit rate easily exceeds 1 Gbps big problems for storage and network communications. E.g. HDTV 1920 x 1080 at 30 frames per second 8 bits per YCbCr PAL channel 1.5 Gbps. 5 Lossy methods have to be employed since the compression ratio of lossless methods e.g. Huffman Arithmetic LZW is not high enough for image and video compression. CM3106 Chapter 12 MPEG Video Video Compression 1 Video Compression MPEG Not the complete picture studied here Much more to MPEG plenty of other tricks employed. We only concentrate on some basic principles of video compression Earlier H.261 and MPEG 1 and 2 standards. with a brief introduction of ideas used in new standards such as H.264 MPEG-4 Advanced Video Coding . Image video and audio compression standards have been specified and released by two main groups since 1985 ISO International Standards Organisation JPEG MPEG. ITU International Telecommunications Union H.261-264. CM3106 Chapter 12 MPEG Video Video Compression