Method and apparatus for scanning a window in the image zone of a charge transfer device of the frame transfer type
US4644405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Jun 10, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/443
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to scan a relatively small window (F) in the image zone (ZI) of a charge transfer device, a series of prior transfers (B.sub.1, B.sub.2, B.sub.3) are performed moving from the image zone to the memory zone (ZM) to move the leading edge of the window until it is adjacent to the output shift register (RD). The lines of the window may then be read conventionally (B.sub.4) omitting any reading of the lines that come before or after. This considerably reduces the delay (between steps B.sub.1 and B.sub.4) between image acquisition and signal processing, without altering the frame frequency which remains fixed at 50 Hz, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.