A few words about video compression ▣Video is seguence of Examples: images displayed at ▣MPEG1(CD-ROM)1.5 constant rate Mbps o e.g.24 images/sec ▣MPEG2(DVD)3-6Mbps Digital image is array of MPEG4 (often used in pixels Internet,1 Mbps) Each pixel represented Research: by bits Layered (scalable)video Redundancy o adapt layers to available o spatial bandwidth o temporal 7:Multimedia Networking 7-14 7: Multimedia Networking 7-14 A few words about video compression  Video is sequence of images displayed at constant rate  e.g. 24 images/sec  Digital image is array of pixels  Each pixel represented by bits  Redundancy  spatial  temporal Examples:  MPEG 1 (CD-ROM) 1.5 Mbps  MPEG2 (DVD) 3-6 Mbps  MPEG4 (often used in Internet, < 1 Mbps) Research:  Layered (scalable) video  adapt layers to available bandwidth