![]() ![]() Tiles divide the frame into a grid of rectangular regions that can independently be decoded/encoded. Introduction of a tile, a new concept, is yet another innovation of H.265/HEVC standard compared to H.264/AVC standard. The adaptive coefficients bypass (ACS) is used to increase the efficiency of entropy encoding’s transform coefficients by explicitly defining the scan order of each transform block. SBAC is an adaptive binary arithmetic encoding method, which employs context models and provides high coding efficiency of various syntax elements with different statistical properties. The proposed entropy encoding is Syntax-based context-adaptive Binary Arithmetic Coding (SBAC). In addition to a modified deblocking filter, an adaptive SAO (Sample Adaptive Offset) filter is added to reduce the secondary distortions of local areas. ![]() Prediction of motion vectors is enhanced, and 1/4-pel interpolation filters are modified.Īdditional prediction angles are included to acquire more accurate prediction structures to increase the coding efficiency of intra frame prediction by reducing the energy of the residual signal.Ī combination of multiple filters is used to reduce the distortion between the original and the reconstructed video frames. Several new algorithmic tools are proposed to improve the coding efficiency of the inter frame prediction. It supports the standard 4 × 4 and 8 × 8 transformations and additional rapid transformations of 16 × 16 and 32 × 32. ![]() A TU is a transform unit, and may include one or more PUs. A CU is a prediction block, and may contain several PUs Asymmetric Motion Partitioning (AMP) is used to increase the coding efficiency of a video frame’s irregular patterns. For efficient compression of HD and 4K video, the supported size of the CUs are 16 × 16 or greater, for example, 32 × 32 and 64 × 64. ![]() A CU is a basic compression unit similar to the macroblock concept used in AVC and MPEG-2 standards, but it has a more flexible nature. Three abstractions are proposed for efficient and flexible representation of videos with various resolutions, including Coding Unit (CU), Prediction Unit (PU), and Transform Unit (TU). To achieve this goal, a number of algorithmic tools are proposed to take into account many aspects of video compression. A key requirement for the new standard is to double the data compression ratio for the same video quality compared to the widespread H.264/AVC standard. H.265/HEVC standard is a revolutionary breakthrough in video compression technology. ![]()
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