Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-03-12
1992-07-21
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358 29, 328132, 307154, H04N 5238, H04N 964
Patent
active
051328054
ABSTRACT:
An iris driving circuit, adapted to a color video camera, detects excessive intensity of radiation above a predetermined level from a white-colored subject so that an iris is controlled to optimize the function of auto white balance. The iris driving circuit has a power supply control circuit for supplying to the respective portion of the system only for the predetermined limit time, a level signal detection circuit for detecting the signal of the excessive intensity of radiation by extracting and amplifying only the luminance signal above the predetermined level, a filter & amplifier circuit for filtering and amplifying the excessive intensity of radiation detected from the level signal detection circuit a white balance set signal generating circuit for generating an auto white balance set signal in accordance with the condition of the excessive intensity of radiation signal filtered from the filter & amplifier circuit, and an iris adjust signal generating circuit for generating an iris adjusting signal after receiving the filtered signal of the excessive intensity of radiation outputted from the filter and amplifier circuit.
REFERENCES:
patent: 3571495 (1971-03-01), Konings
patent: 4638350 (1987-01-01), Kato et al.
patent: 4727413 (1988-02-01), Miura et al.
patent: 4737855 (1988-04-01), Arai et al.
patent: 4959727 (1990-09-01), Imaide et al.
Bushnell Robert E.
Groody James J.
Metjahic Safet
Samsung Electronics Co,. Ltd.
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