Quantization device and method, inverse-quantization device and method, and image processing device and method
US5923787A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A quantization device includes a multiplying unit for multiplying one of n.times.n values of quantization matrix information by a selected scale factor so as to provide quantization basis information. The n.times.n values correspond to n.times.n pixels of a process block. These values are used as threshold values for quantization. A quantization operation unit for carrying out a quantization process on one of n.times.n orthogonal transformation coefficients uses the quantization basis information to provide a quantization coefficient, and a scale factor supplying unit for providing the noted one of the scale factors for the multiplying unit for using process location information which indicates a location in n.times.n matrix of the noted one of the n.times.n orthogonal transformation coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.