Filter architecture, particularly for video applications
US5589890A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 29, 1994 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | Sep 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2222/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A filter architecture particularly for video applications, includes a filter section for separating high pass and low pass components from a video input signal conveying a video image, a brilliance estimating section for determining a mean brilliance value for each of a plurality of sections into which the video image is divided, first and second image characteristic adjusting sections for modifying the high pass and low pass components in response to the mean brilliance values, and a summing section for combining the modified high pass and low pass components to generate a filtered video signal. The first and second image characteristic adjusting sections operate using Fuzzy Logic which enables the filter architecture to effectively adjust contrast and brightness in the video image over a wide range of image brightness values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.