Quantization error compensation apparatus and method thereof
US7203375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2003 |
| Grant date | Apr 10, 2007 |
| Priority date | — |
| Expiry date | Sep 26, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T5/92
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A quantization error compensation includes a dividing unit to divide an input current image signal into a first high-frequency signal and a low-frequency signal; a changing unit to replace bits of the first high-frequency signal with a predetermined signal to output a second high-frequency signal; an adding unit to add the low-frequency signal and the second high-frequency signal to create a composite signal; a quantization unit to cut n number of bits of the composite signal and to output the cut composite signal and the n number of bit signal; an equalizing unit to output a brightness equalizing value of the cut composite signal; a calculating unit to calculate a compensation value using the n number of the bit signal and a difference between brightness equalizing values with respect to a current and next brightness levels; and a compensation unit to add the compensation and the current brightness equalizing values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.