MPEG2 System Mux ISOIEC 13818 2 Video Data

MPEG-2 System Mux(다중화) ISO/IEC 13818 -2 비디오 규격 Video Data Audio Data Video Encoder Audio Encoder ISO/IEC 13818 -3 오디오 규격 Packetizer Video PES Audio PES Elementary Stream Data Baseband MPEG Program Stream MUX Transport Stream MUX ISO/IEC 13818 -1 다중화 규격 Program Stream (DVD) Single Program Transport Stream

SD 4: 2: 2 Sampling Serialized SD: 13. 5 MHz HD: 74. 25 MHz 10 Parallel Bits A/D Cb Y Cr Y Cb A/D Cb Y Cr Y Y 4: 2: 2 10 Bit Parallel Samples at 27 MHz or 148. 5 MHz Cr A/D SD: 6. 75 MHz HD: 37. 125 MHz Parallel to Serial Converter SD: 270 MHz HD: 1. 485 GHz ITU-R BT. 601 -2 Serial Digital Component 270 Mb/s

Temporal Redundancy Elimination

MPEG 2 공간적 압축 • Based on Discrete Cosine Transfer (DCT) Process – 8 x 8 Pixel Group – In this example, all 64 pixels are the same, the color of the sky. 8 8

Data Compression Standards ITU-T Joint ITU-T, ISO/IEC H. 261 H. 263+ (1990) (1995) (199? ) JPEG MPEG-2 (1992) (1994) MPEG-1 MPEG-4 (1992) (1998) JPEG: Joint Photographic Experts Group MPEG: Moving Pictures Experts Group

Temporal Redundancy Elimination

MPEG-2 Coding Scheme Picture Sequence I 1 B 2 B 3 P 4 B 5 B 6 P 7 B 8 B 9 P 10 B 11 B 12 I 13 I-Picture Coding I 13 P-Picture Coding I 1 P 4 P 7 I 13 P 10 B-Picture Coding B 2 B 3 B 5 B 6 B 8 B 9 B 11 B 12

MPEG-2 Video Encoding • Lossy Compression – Temporal redundancy elimination: Motion compensated prediction – Spatial redundancy elimination: Discrete Cosine Transform – Linear/Non-linear Quantization • Lossless Compression – 2 D-VLC(Huffman Coding): (Magnitude, Zero-Run Length) Input Video Analyzer Video In Rate Control Lossy Compressor Lossless Compressor Bitstream Buffer Compressed Video Out

MPEG-2 Traffic Coded bit size Relative Coded Bit Size in MPEG I-picture P-Picture B-Picture GOP frame

시간적 중복성 • 이웃한 프레임간의 중복성 I Frame • New location same data • New data uncovered P Frame

MPEG 비디오 압축 - B Frame I Frame P Frame Forward Motion Vector I Frame Reverse Motion Vector B Frame P Frame

4: 2: 0 샘플링 X X X X X X X X X X X X X X X X 4: 2: 2 4: 1: 1 X X X X X 1 Luminance Sample Y 2 Chrominance Samples Cb, Cr X X X X 4: 2: 0