Context-adaptive binary arithmetic coding

Discrete cosine transform

Mathematics

Discrete wavelet transform

Data compression

Operating system

Algorithm

Image (mathematics)

Statistics

Context-adaptive variable-length coding

Transform coding

Coding (social sciences)

Artificial intelligence

Standardization

Coding tree unit

Wavelet transform

Computer science

Lapped transform

Wavelet

Decoding methods

Variable-length code

Coding gain

S transform

IEEE Transactions on Circuits and Systems for Video Technology

In the past decade, the development of transform coding techniques has achieved significant progress and several advanced transform tools have been adopted in the new generation Versatile Video Coding (VVC) standard. In this paper, a brief history of transform coding development during VVC standardization is presented, and the transform coding tools in the VVC standard are described in detail together with their initial design, incremental improvements and implementation aspects. To improve coding efficiency, four new transform coding techniques are introduced in VVC, which are namely Multiple Transform Selection (MTS), Low-Frequency Non-separable Secondary Transform (LFNST) and Sub-Block Transform (SBT), as well as a large (64-point) type-2 DCT. The experimental results on VVC reference software (VTM-9.0) show that average 4.5% and 3.6% overall coding gain can be achieved by the VVC transform coding tools for All Intra and Random Access configurations, respectively.

Transform Coding in the VVC Standard