Iris circuit of a video camera

Details Iris circuit of a video camera Iris circuit of a video camera

1989-07-12

1991-10-01

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, H04N 5238

Patent

active

050538780

ABSTRACT:
An iris circuit of a video camera which can automatically adjust opening and shutting of the iris of a camera lens according to the magnitde of a NAM (non additive magnitude) signal provided by taking out the highest value from the peak values of R,G and B color video signals. The iris circuit includes means for detecting each of the peak value and the means value of the NAM signal, and mean for combining the peak value and the mean value for providing an iris driving voltage so that the iris may be open or shut according to the magnitude of the NAM signal.

REFERENCES:
patent: 4050085 (1977-09-01), Prince et al.
patent: 4542403 (1985-09-01), Zimmermann et al.
patent: 4638350 (1987-01-01), Kato et al.
patent: 4689689 (1987-08-01), Saito et al.
patent: 4714966 (1987-12-01), Saito et al.

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