Method and apparatus for estimating a quantization table for a video image
US9621884B2 · kind B2 · utility
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Key dates
| Filing date | Nov 22, 2013 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | May 9, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of estimating a quantization table for an image block, which is compressed in image processing, includes performing a first quantization using a table dictionary that includes a number of candidate quantization tables for the compressed image block; performing edge-related filtering on the compressed image block and performing a second quantization using the table dictionary for the filtered compressed image block; and estimating a quantization table for the compressed image block based on energy costs of the first-quantized image block and the second-quantized image block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.