Image sensing device having expanded dynamic range
US5517242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1994 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Jun 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/589
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image sensing device is provided with an expanded dynamic range when it photographs a moving object. A first gray value D1 of first picture taken with first exposure time is read in the first time interval and a second gray value D2 of second picture taken with second exposure time is read in the second time interval. Two function values f(D2) and g(D2) are calculated with respect to the second gray value D2. Then, a weight coefficient with respect to the function f(D2) is multiplied by the first gray value D1 and a weight coefficient with respect to the function g(D2) is multiplied by the second gray value D2. Those multiplied gray values are summed up. Such calculation of multiplying and summing up is carried out in each picture element of the first picture and the second picture, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.