Image signal processing apparatus with analog to digital image c

Details Image signal processing apparatus with analog to digital image c Image signal processing apparatus with analog to digital image c

1991-08-23

1994-09-06

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Brightness control

348694, 348696, H04N 518

Patent

active

053452798

ABSTRACT:
An image signal processing apparatus wherein the black level of an analog image signal is adjusted by controlling the clamp level of the inputted analog image signal. The clamped analog image signal is digitalized. Using the digital image signal offset to a first level during the blanking period, the black level adjustment of the analog image signal is carried out. The first level during the blanking period of the digital image signal corresponding to the analog image signal with the black level having been adjusted, is changed to a second level, allowing a correct and easy black level adjustment using a simple circuit arrangement.

REFERENCES:
patent: 4642696 (1987-10-01), George
patent: 5008753 (1991-04-01), Kitaura et al.
patent: 5084700 (1992-01-01), Christopher
patent: 5087973 (1992-02-01), Kawahara
patent: 5142643 (1992-08-01), Yonejirou et al.

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