Signal processing apparatus for use with a single chip solid-state color camera
US4884129A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1988 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Mar 22, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/136
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal processing apparatus for use with an imaging device having an image signal output circuit inherently generating noise in operation so that noise may be superposed on the image signal. The apparatus comprises a noise suppressor having a sampling and holding circuit for producing noise-suppressed pixel signals carrying different color information to contribute to suppression of noise superposed on the image signal and at the same time to demodulation of chroma signals representative of color components of an image and adders for producing a sum of and a difference between the noise-suppressed pixel signals to thereby produce a luminance signal and chroma signals for an image. The apparatus may further comprise a gain control circuits interposed between the sampling and holding circuit and the difference producing adder so that the amplitudes of the noise-suppressed pixel signals are leveled to improve the color purity of an image reproduced from the image signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.