By Byung-Gyu Kim, Kalyan Goswami
This booklet discusses intimately the elemental algorithms of video compression which are generic in smooth video codec. The authors dissect complex requirements and current fabric in a manner that will get readers quick in control through describing video compression algorithms succinctly, with out going to the mathematical information and technical standards. For speeded up studying, hybrid codec constitution, inter- and intra- prediction recommendations in MPEG-4, H.264/AVC, and HEVC are mentioned jointly. furthermore, the newest learn within the speedy encoder layout for the HEVC and H.264/AVC is usually included.
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Moreover, bidirectional prediction technique is also adopted in HEVC. Hence, two motion vectors (MVs) are calculated separately for each inter-PB using two reference pictures from list-0 and list-1. For each MV, RD cost is calculated using the original and generated predicted blocks. 1. In this table, we are only considering the inter-mode prediction and also the merge/skip prediction. 1, 1864 RD cost calculations are required for a 64 64 CU size, to predict its correct inter-mode. In this table, we do not consider the RD cost of intra-mode.
In this example, only the vertical padding is considered. No doubt that if we consider different other orientations of padding, then the prediction will be more accurate. Let us consider three orientation of padding as shown in Fig. 2. In this diagram apart from the vertical padding, horizontal padding and diagonal padding are also considered. So, for this example, all the three predictions are performed (vertical, horizontal, and diagonal). The corresponding residual blocks are generated, and the rate-distortion cost values are calculated.
Other than the skip mode, eight different PU modes are available for the inter-prediction. Among these eight modes, two modes are square shaped, PART_2N 2N and PART_N N, and two modes are rectangular shaped, PART_N 2N and PART_N 2N. These four types of prediction modes (square and rectangular) are symmetric in nature. For all CU sizes (64 64 to 8 8), the symmetric-shaped prediction modes are calculated. On the other hand, the rest of the four inter-prediction modes are grouped as asymmetric prediction modes (AMP modes).