White balance controller for an image pick-up apparatus including an abnormality detector
US5177599A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Jul 17, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A white balance controller for an image pickup apparatus having an image pickup for providing an output indicative of an image, a color separator responsive to the output of the image pickup for producing a luminance signal and a plurality of color signals therefrom, gain controllers for controlling a gain of at least two color signals of the plurality of color signals separated by the color separator, and a color difference signal generator for generating color difference signals from at least one of a color signal and luminance signal. The white balance controller includes white/achromatic detection for detecting at least one of a white and achromatic portion within an image picked up by the image pickup in accordance with a least the color difference signals, and an abnormality detector for detecting an abnormality of white balance within the picked up image. The abnormality detector supplies an output thereof to an input of the white/achromatic detector and enables control of a gain of the gain controllers in accordance therewith for enabling white adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.