VVC/H.266会议提案阅读（一）之JVET-A1001

最近在学习VVC/H.266，希望记录一下自己的学习过程。自己是菜鸟一枚，目前在研究各个提案，加油学习吧！

JVET-A1001

A1001是JEM的相关描述。它描述了ITU-T VCEG以及ISO/IEC MPEG组成的联合小组(JVET)正在研究的测试模型JEM的编码特性，该模型中，HEVC大致的框架并没有改变，如下图：

JEM中增加的技术大致有：
1、Block structure
Larger Coding Tree Unit (up to 256x256) and transforms (up to 64x64)
Quadtree plus binary tree (QTBT) block structure
2、Intra prediction improvements
65 intra prediction directions
4-tap interpolation filter for intra prediction
Boundary filter applied to other directions in addition to horizontal and vertical ones
Cross-component linear model (CCLM) prediction
Position dependent intra prediction combination (PDPC)
Adaptive reference sample smoothing
3、Inter prediction improvements
Sub-PU level motion vector prediction
Locally adaptive motion vector resolution (AMVR)
Overlapped block motion compensation (OBMC)
Local illumination compensation (LIC)
Affine motion prediction
Pattern matched motion vector derivation
Bi-directional optical flow (BIO)
4、Transform
Explicit multiple core transform
Mode dependent non-separable secondary transforms
Signal dependent transform (SDT)
5、Adaptive loop filter (ALF)
6、Enhanced CABAC design
7、Context model selection for transform coefficient levels
Multi-hypothesis probability estimation
Initialization for context models

下面将根据文档顺序分别描述。