Optical image processing method and system to perform unsharp masking on images detected by an I.I./TV system
US4918534A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 22, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Apr 22, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical image processing method and system in a radiographic system, wherein an image of an object is produced by an image intensifier and converted to video signal by a television (TV) camera system. A liquid crystal display (LCD) is placed bewteen the image intensifier and the T.V. camera system at a location shifted from a focal plane of the T.V. camera system. The liquid crystal display defines plural pixels which are controllable so that light produced by the image intensifier and impinging on the plural LCD pixels can be selectively attenuated by application of selected control signals to the LCD. Control signals are generated selectively based on predetermined parameters of the radiographic system and the image. These control signals are applied to the LCD to perform selective attenuation and corresponding dynamic range compression of light passing through respective LCD pixels, thereby to perform unsharp masking of the image produced by the image intensifier using the LCD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.