Automatic iris control for solid-stage imaging apparatus

Details Automatic iris control for solid-stage imaging apparatus Automatic iris control for solid-stage imaging apparatus

1980-06-03

1982-04-27

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, H04N 526

Patent

active

043273785

ABSTRACT:
An iris controls the amount of light transmitted through television camera lens to an integrated semiconductor matrix of light responsive elements. A characteristic of the matrix is that photo-charges may overflow the light responsive elements if the light falling on the matrix becomes too bright. The normal iris control responds to a loss of picture contrast caused by the overflow of charges and attempts to increase contrast by increasing the amount of light passing through the lens. The invention compares the output from the light responsive elements with a reference signal representing black areas in the picture. When the comparison exceeds a given difference, a special iris control overrides the normal iris control in order to reduce the amount of light passing through the lens. The reference signal may be taken from one or more of the light responsive elements which are shielded from light passing through the lens. Or, the reference signal may be taken during periods between picture frames when the video signal does not record any light.

REFERENCES:
patent: 3576393 (1971-04-01), Thompson
patent: 3586773 (1971-06-01), Niemyer
Automatic Light Control Electro-Optical CCDTV Systems; Sandhu, et al; Jan. 1978, IEEE Trans on Aerospace and Electronic Systems, vol. Aes-14 #1.

Affiliated with

Also associated with

Rating

Automatic iris control for solid-stage imaging apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic iris control for solid-stage imaging apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic iris control for solid-stage imaging apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2200568