Visible and near infrared imaging system
US4617593A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 1984 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Aug 7, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/672
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved visible and near infrared imaging system, in a first embodiment, has an optical system, chopper, improved detector, improved first and second delta frames, display, and timing and control circuits. The detector is a parallel amplification type detector with the sense lines each including a total subtraction chain. Each parallel amplifier chain is split so that two branches exist, each containing sample and hold circuits and one with a gain of -C.sub.s /(C.sub.d +C.sub.s) times the other. The outputs of the amplifier chains are multiplexed to the first delta frame for storage by frame for summation with the outputs of the next frame for substantially reducing the reset noise. The summed output signals are multiplexed at a 2x rate into the second delta frame for removal of the pattern noise and multiplexed out at a 1x rate for display. In a second embodiment a transversal filter receives the output of the second delta frame for performing a peaking function on the signals for improving the resolution of the displayed image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.