Context derivation and entropy coding initialization parameters for coordinates of last position coding in video coding
US11336893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2021 |
| Grant date | May 17, 2022 |
| Priority date | — |
| Expiry date | Jan 5, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An example device for coding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: determine a size of a dimension of a current block of the video data; calculate a context for entropy coding a last significant coefficient coordinate along the dimension, wherein to calculate the context, the one or more processors are configured to: calculate a context shift value according to ((log 2TrafoSize+1)>>2)<<1, wherein log 2TrafoSize represents a logarithmic value of the size of the dimension, ‘>>’ represents a bitwise right shift operator, and ‘<<’ represents a bitwise left shift operator; and calculate the context using the context shift value; and entropy code the last significant coefficient coordinate using the calculated context.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.