Filter circuit, image processing apparatus, imaging apparatus, image processing method, and computer program
US8314862B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 2010 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Apr 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/907
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A filter circuit includes: a first weight-coefficient calculating unit calculating first weight coefficients concerning pixel levels in a first pixel and second pixels surrounding the first pixel; a first weight-coefficient adjusting unit replacing, when the first weight coefficients of a pair of the second pixels symmetrically arranged across the first pixel are different from each other, the first weight coefficient of the second pixel having a larger one of the first weight coefficients of the pair of the second pixels with the first weight coefficient of the second pixel having a smaller one of the first weight coefficients; a third weight-coefficient calculating unit integrating the first weight coefficients and second weight coefficients concerning positions of the pixels to calculate third weight coefficients of the pixels; and a correction processing unit correcting the pixel level of the first pixel using the third weight coefficients and the pixel levels of the pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.