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Introduction to H.264 Advanced Video Compression
- 1. An introduction to H.264 Advanced Video Compression Iain Richardson 22 nd March 2010 V CODEX
- 21. Forward Transform + Quantize Block of samples Integer transform Quantized, QP=18 961 -41 15 -48 -34 72 -30 -104 -15 3 15 24 13 81 -5 8 58 64 51 58 52 64 56 66 62 63 61 64 59 51 63 69 48 -1 0 -1 -1 1 -1 -2 0 0 0 0 0 1 0 0
- 24. Block of samples Quantized, QP=18 Rescaled + inverse transformed 58 64 51 58 52 64 56 66 62 63 61 64 59 51 63 69 48 -1 0 -1 -1 1 -1 -2 0 0 0 0 0 1 0 0 55 66 54 58 54 62 58 63 61 59 61 62 60 55 65 67
- 25. About the Integer Transform 1-D Discrete Cosine Transform 1-D Integer Transform 1 1 1 1 2 1 -1 -2 1 -1 -1 1 1 -2 2 -1 0.5 0.5 0.5 0.5 0.6532… 0.2706… -0.2706… -0.6532… 0.5 -0.5 -0.5 0.5 0.2706… -0.6532… 0.6532… -0.2706…
- 27. Entropy coding Headers Prediction parameters Quantized coefficients Fixed length codes Exp-Golomb codes Context Adaptive Variable Length Codes Context Adaptive Binary Arithmetic Codes