Color Models in Digital Video R Y 1402 C r G Y 0344 C b 0714 C r B Y 1772 C b Y

Color models in digital video r y 1402 c r g y 0344 c

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Color Models in Digital Video R = Y +1.402 C r G = Y – 0.344 C b – 0.714 C r B = Y + 1.772 C b Y = 0.299R + 0.587G + 0.114B C b = 0.564(B –Y) C r = 0.713(R –Y) Conversion to RGB Conversion to YUV Multimedia System 030728.ppt 20 Chroma Subsampling Y sample Cr sample Cb sample 4:4:4 4:2:2 4:2:0 Figure: Chrominance subsampling patterns • 4:4:4 implies full fidelity • 4:2:2 is for high quality colour production • 4:2:0 is for digital television, video conferencing and DVD • 4:2:0 video requires exactly haf as many samples as RGB or 4:4:4 video Y:Cr:Cb =
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Multimedia System 030728.ppt 21 Video Macroblock C R C B Y 4 3 6 5 2 1 Multimedia System 030728.ppt 22 GOB for H.261 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 GOB structures in CIF and QCIF for H.261 QIF CIF COB 12 COB 11 COB 5 COB 10 COB 9 COB 3 COB 8 COB 7 COB 1 COB 6 COB 5 COB 4 COB 3 COB 2 COB 1 GOB Structures Multimedia System 030728.ppt 23 Type of Media and Communication Modes Text, data, image and graphics media are known as discrete media Audio and video media are known as continuous media Most of the time, a multimedia systems can be distinguished by the importance or additional requirements imposed on temporal relationship in particular between different media; synchronization, real-time application. In multimedia systems, there are 2 communication modes:- people-to-people people-to-machine An user interface is responsible to integrate various media and allow users to interact with the multimedia signal. Multimedia System 030728.ppt 24 Enabling Technologies for Multimedia Communication High speed digital network E.g. optical backbone for network to network service and Ethernet / Digital Subscriber Line (DSL) / Cable broadband services to the public in Hong Kong Video compression Algorithms like MPEG 2 and MPEG 4 are available for high and low bit rate applications Data security Encryption and authentication technologies are available to protect users against eavesdropping and alternation of data on communication lines. Intelligent agents Software programs to perform sophisticated tasks such as seek, manage and retrieve information on the network
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Multimedia System 030728.ppt 25 Interaction of Media in Communication Multimedia System 030728.ppt 26 A Typical Multimedia Communication System Network Video Interface Audio Interface Control / MUX / DeMUX Data Interface (Still Image / Data / File Transfer Network Interface Multimedia System 030728.ppt 27 Analogue Representation Vs Digital Representation Compression Compression technique can be easily applied to digitized data. Since the digitization of an audio and video that much higher bit rates and longer time durations are involved. In order to reduce the bit rate to a level which various the communication networks can support, so the compression is applied to text, audio, image and video by different types of compression algorithms.
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