Fixed point integer division techniques for AC/DC prediction in video coding devices
US7895250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2005 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Dec 23, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2207/5356
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The disclosure describes a method for performing a fixed point calculation of a floating point operation (A // B) in a coding device, wherein A // B represents integer division of A divided by B rounded to a nearest integer. The method may comprise selecting an entry from a lookup table (LUT) having entries generated as an inverse function of an index B, wherein B defines a range of values that includes every DC scalar value and every quantization parameter associated with a coding standard, and calculating A // B for coding according to the coding standard based on values A, B1 and B2, wherein B1 and B2 comprise high and low portions of the selected entry of the LUT. The techniques may simplify digital signal processor (DSP) implementations of video coders, and are specifically useful for MPEG-4 coders and possibly others.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.