Quantization parameter adjustment based on sum of variance and estimated picture encoding cost
US9565440B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2013 |
| Grant date | Feb 7, 2017 |
| Priority date | — |
| Expiry date | Jul 22, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/198
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video processing device includes a rate control module to determine more accurate initial quantization parameters at each scene switching point and to adjust the QP parameters in response to scene changes using a sum of variances metric and an estimated picture encoding cost metric from a coding complex estimation block. To determine a first quantization parameter set, a sum of variances metric and an estimated picture encoding cost metric for an initial set pictures of a video stream are used. A bit allocation module is to set a target bit allocation for infra-encoded pictures as substantially proportional to the sum of variances metric and substantially inversely proportional to the estimated picture encoding cost metric, and set a target bit allocation for forward predictive and bi-predictive pictures as substantially proportional to the estimated picture encoding cost metric and substantially inversely proportional to the sum of variances metric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.