Television camera equipped with an anti-blooming device

Details Television camera equipped with an anti-blooming device Television camera equipped with an anti-blooming device

1981-02-10

1983-04-12

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 534

Patent

active

043800289

ABSTRACT:
A television camera equipped with a device making it possible to automatically eliminate the blooming effect produced by a saturating bright spot.
The device includes a closed loop formed by a circuit for the comparison of the video signal with a predetermined threshold close to the saturating level and whose output supplies a generator for deflection signals corresponding to the localization at X and Y of the bright spot on the image and a generator for producing a unblanking signal for the tube during the line flyback and with a frequency variable as a function of the brightness of the bright spot, and circuits for mixing the deflection and unblanking signals respectively with TV scan deflection signals and with the beam blanking signal in such a way that there is a local modification of the tube sensitivity at the location of the bright spot by reducing the charge integration time.

REFERENCES:
patent: 4190865 (1980-02-01), Bendell
patent: 4259691 (1981-03-01), Monahan et al.
L'onde Electrique, vol. 52, No. 8, pp. 367-370, Sep. 1972.

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