Error reduction in transformed digital data
US6393155B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1998 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Nov 4, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/007
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This invention solves problems due to employing error degraded data in digital processing. It particularly solves multi-generation problems wherein transform data degrade during each inverse transform and forward transform cycle even without any processing due to the rounding and clipping errors. It provides methods, systems and devices for reduced-error processing of transform-coded data. After inverse transformation of transform data, high-precision numbers are converted to integers and clipped to an allowed range forming converted data. High-precision differences are obtained by subtracting the high-precision output of the inverse transform from the converted data. The converted data can be manipulated and sent to output devices which expect integer data. Processed high-precision numbers are formed by adding the high-precision differences to the processed converted data. Thus, the rounding and clipping errors are greatly reduced in the processed high-precision numbers. In another embodiment of the present invention processed high-precision numbers are generated by selecting the high-precision numbers instead of the manipulated converted data whenever the manipulated converted da…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.