Look-up table for transfer function
US8665486B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2004 |
| Grant date | Mar 4, 2014 |
| Priority date | — |
| Expiry date | May 9, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/843
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Transfer functions are often used for image processing. Look-up tables can be used to implement transfer functions in a processor-efficient manner. In one embodiment, the invention is an apparatus that includes a look-up table (LUT) storing sample outputs from an output range of a transfer function, the sample outputs corresponding to sample inputs from an input range of the transfer function, the sample inputs being distributed so that more sample inputs are associated with a first region of the transfer function than a second region of the transfer function; and an address module to calculate an index into the LUT based on image data. In one embodiment, the apparatus uses the LUT to process the image data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.