System and method for generating a contrast overlay as a focus assist for an imaging device
US5496106A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1994 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Dec 13, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for generating and displaying a contrast false color overlay as a focus assist includes a signal divider, an automatic gain control unit, an adder, a signal reducer and a signal combiner. The signal divider receives a signal representing an image and divides the signal into a red channel signal, a green channel signal and a blue channel signal. The red, green and blue channel signals are input to the signal reducer and respectfully reduced by a percentage value. The reduced Green and Blue channel signals are input to the signal combiner and combined with the output of the adder. A luminance signal is also input or generated from the channel signals and is fed to the automatic gain control unit which produces a contrast signal whose brightness is proportional to the contrast in the image. The contrast signal is input to the adder along with a reduced version of the red channel signal where the two signals are added together, and the output of the adder is provided to the combiner. The output of the combiner is then provided to the output device for display of the image. The present invention also comprises a method for adjusting the display to provide a false color contrast…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.