Non-linear VDR residual quantizer
US9066070B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2012 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Apr 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/2365
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In layered VDR coding, inter-layer residuals are quantized by a non-linear quantizer before being coded by a subsequent encoder. Several non-linear quantizers are presented. Such non-linear quantizers may be based on sigmoid-like transfer functions, controlled by one or more free parameters that control their mid-range slope. These functions may also depend on an offset, an output range parameter, and the maximum absolute value of the input data. The quantizer parameters can time-vary and are signaled to a layered decoder. Example non-linear quantizers described herein may be based on the mu-law function, a sigmoid function, and/or a Laplacian distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.