Automatic white balance control circuit
US4646161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Sep 10, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A fully automatic white balance control circuit which is sensitive to changes in the ambient or incident illumination as well as to changes in the object being viewed includes a main photo-sensor having a video output from which three primary color signals are derived, three external or incident light sensing elements having spectral characteristics the same as those of the main photo-sensor for the three primary colors, three capacitors for converting output currents from the three external light sensing elements to respective voltages, a voltage comparator for comparing a voltage across at least the one capacitor corresponding to green light with a reference voltage, and three sample-and-hold circuits for sampling and holding voltages from the three capacitors, respectively. Charging of the three capacitors by output currents from the three external light sensing elements, respectively, is started at the commencement of each cycle, for example, each vertical period, and, when the voltage comparator produces a compared output in response to the voltage across the one capacitor having become equal to the reference voltage, the charging is stopped and the voltages then present on th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.