3. Coding Rate and Standards Mobile videophone Videophone over PSTN ISDN videophone Digital TV HDTV Video CD MPEG-4 MPEG-1 MPEG-2 H.261 H.263 8 16 64 384 1.5 5 20 kbit/s Mbit/s Very low bitrate Low bitrate Medium bitrate High bitrate
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17. MPEG-2 Levels 60 1152 1920 High 60 1152 1440 High 1440 30 576 720 Main 30 288 352 Low Max Frame/s Max Lines Max Pixels Level
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27. MPEG-4 Structure A/V object Decoder MUX Compositor Bitstream Audio/Video scene A/V object Decoder A/V object Decoder
32. Summary of Standards SIF: Standard Interchange Format, 352x240 pixels at 30 Hz. Versatile multimedia coding standard 5kbps – tens Mbps Various MPEG 4 Various Various Various H.264 VHS quality video recording Digital video broadcasting High definition TV (4/3) High definition TV (16/9) <4Mbps <15Mbps <20Mbps <60Mbps <80Mbps <80Mbps <100Mbps SIF 4:2:0 4:2:2 4:2:0 4:2:2 4:2:0 4:2:0 MPEG 2 Low Main High 1440 High VHS quality video storage <1.5Mbps SIF MPEG 1 Video conferencing over low bits rate channels <64kbps S-QCIF/ QCIF H. 263 Video conferencing over LANs X 64 kbps CIF/ QCIF H. 261 Example applications Compressed rate Digitisation format Standard
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36. Block Diagram Entropy Coding Scaling & Inv. Transform Motion- Compensation Control Data Quant. Transf. coeffs Motion Data Intra/Inter Coder Control Decoder Motion Estimation Transform/ Scal./ Quant . - Input Video Signal Split into Macroblocks 16x16 pixels Intra-frame Prediction De-blocking Filter Output Video Signal
