H.265 / HEVC learning note: coding structure

Code structure: Sympture of the layered processing architecture and encoding the post-encoded code stream 1, layered processing architecture when encoding When compressed by the video sequence, it will be divided into a number of small image groups (GOP, Group Of Pictures), define the compressed data generated after a GOP encoding is CVS (Coded Video Sequence) In the video cord, there is a closed GOP and open GOP Each image group contains several images, each picture can be divided into one or more pieces (SLICE) Each GOP is divided into several pieces (SLICE), and the slice is independently encoded. Each piece consists of one or more segments (SS, SLICE Segment) When an SS is encoded, it is split into a tree structure unit (CTU, Coding Tree Unit), and the CTU is the concept of HEVC. Each CTU is divided into different types of coding units (CU, Coding Unit) in accordance with the quadrush. 2, compressed code stream structure GOP layer, commonly used in the SLICE layer freely out of the sequence parameter set (SPS, SEQUENCE Paramenter Set) and image parameter set (PPS, Picture Paramenter SET) The SPS contains all images shared in the CVS, including decoding related information, such as grade level, resolution deng The PPS includes all public parameters of an image, that is, all SSs in an image use the same PPS, including initial image control information, such as initial quantization parameters (QP, Quantization Parament, block information, etc. In addition, in order to adapt to other applications such as a graded video encoder, a multi-view video encoder, a video parameter set (VPS, VIDEO PARAMENT SET) is added, which contains multiple sub-layers shared syntax elements, and others do not belong to SPS Specific information, etc. The order of the reference acquisition parameters is as follows (essentially a tree structure): SS < - PPS .1881 .-- sps .1881 .-- VPS

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