AV2通过重构变换与熵编码，实现更高画质更低码率。
Transform and Entropy Coding in AV2
- 采用数据驱动的新变换核与可变分区设计
- 支持更低码率下保持高画质，压缩效率显著提升
- 适合对视频压缩效率要求高的实时应用
AV2是联盟开放媒体（AOMedia）开发的AV1视频编码标准的继任者，旨在在保持低复杂度编解码器的前提下，实现显著的压缩增益和主观质量提升。本文介绍了AV2中的变换、量化与熵编码设计，包括重新设计的变换核、数据驱动的变换、扩展的变换分块以及模式与系数相关的变换信号传输。新引入的编码工具包括：帧内/帧间次级变换（IST）、格状编码量化（TCQ）、自适应变换编码（ATC）、概率自适应速率调节（PARA）、前向跳过编码（FSC）、跨色度分量变换（CCTX）、奇偶隐藏（PH）及改进的无损编码。这些技术使AV2能够在显著降低码率的同时，为视频应用提供最高画质体验。
原文摘要 · Abstract (English)
AV2 is the successor to the AV1 video coding standard developed by the Alliance for Open Media (AOMedia). Its primary objective is to deliver substantial compression gains and subjective quality improvements while maintaining low-complexity encoder and decoder operations. This paper describes the transform, quantization and entropy coding design in AV2, including redesigned transform kernels and data-driven transforms, expanded transform partitioning, and a mode & coefficient dependent transform signaling. AV2 introduces several new coding tools including Intra/Inter Secondary Transforms (IST), Trellis Coded Quantization (TCQ), Adaptive Transform Coding (ATC), Probability Adaptation Rate Adjustment (PARA), Forward Skip Coding (FSC), Cross Chroma Component Transforms (CCTX), Parity Hiding (PH) tools and improved lossless coding. These advances enable AV2 to deliver the highest quality video experience for video applications at a significantly reduced bitrate.
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