Television – Camera – system and detail – Optics
Patent
1994-02-23
1995-09-19
Greening, Wendy R.
Television
Camera, system and detail
Optics
348353, H04N 5232
Patent
active
054520053
ABSTRACT:
In an automatic focusing device for an imaging apparatus, a band-pass filter separates high frequency components from a luminance signal. A window processing section extracts a part of the output of the band-pass filter which lies in a predetermined focus area. In a slice circuit, a first and a second high level priority circuit slice respectively positive components and negative components, which constitute the extracted signal, on the basis of a reference voltage generated by a reference voltage source. A differential amplifier amplifies a difference between the outputs of the two high level priority circuits. An absolute value circuit regulates the amplified signal to a predetermined polarity. A peak hold circuit transforms the output of the absolute value circuit to a sampled peak value signal. An integrating circuit integrates the peak values of the peak value signals every predetermined period of time so as to calculate an evaluation value for focusing.
REFERENCES:
patent: 3786184 (1974-01-01), Pieters
patent: 4383274 (1983-05-01), Inuiya
patent: 4706124 (1987-11-01), Baba
patent: 4782396 (1988-11-01), Park
patent: 4985777 (1991-01-01), Kawada
patent: 5107337 (1992-04-01), Ueda
patent: 5126849 (1992-06-01), Senuma
Kubo Naoki
Watanabe Mikio
Fuji Photo Film Co. , Ltd.
Greening Wendy R.
LandOfFree
Automatic focusing device capable of removing noise components f 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 focusing device capable of removing noise components f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing device capable of removing noise components f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1831578