Electronic still camera for generating long time exposure by adding results of multiple short time exposures
US4614966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1983 |
| Grant date | Sep 30, 1986 |
| Priority date | — |
| Expiry date | Aug 16, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/57
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image recording apparatus includes a solid state image pickup; an A/D converter for converting a one-frame analog image signal from the solid-state image pickup to a one-frame digital image signal; and a recorder coupled to the A/D converter for accumulating a plurality of one-frame digital image signals which are intermittently and successively picked up by the image pickup and output from the A/D converter to form a single one-frame digital image signal, and for recording the single one-frame digital image signal. The recorder includes a memory for storing the single one-frame digital image signal. An adder is provided for adding the one-frame digital image signal produced from the A/D converter and a single one-frame digital signal produced from the memory, and for writing the addition results into the memory. A detector is coupled to an output of the adder for detecting a minimum value of the single one-frame digital image signal, and a subtracter is provided for subtracting the minimum value from the single one-frame digital image signal read out from the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.