Image signal processing apparatus for image sensor
US6522359B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1996 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | May 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image signal processing apparatus of the present invention comprises an image sensor for outputting an image data, a sample hold circuit for holding an image data output, a sample hold circuit outputs an analog signal, AD converter for converting the analog signal to a digital signal, a system clock generator for generating a first clock &phgr; 1, a timing generator for controlling hold timing of sample hold circuit according to the first clock &phgr; 1, a second system clock generator for generating a second system clock &phgr; 2 having different phase from the phase of the first system clock &phgr; 1 and AD conversion clock generator for controlling conversion timing of AD converter according to the second clock &phgr; 2. Since two different clocks are used, hold timing does not overlap with a conversion timing. Therefore, the reading of the image data becomes stable and misreading can be reduced and also quality of an image is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.