Automatic focusing system of video camera using the contrast cha

Details Automatic focusing system of video camera using the contrast cha Automatic focusing system of video camera using the contrast cha

1986-10-14

1988-11-01

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

G03B 300, H04N 5232

Patent

active

047823968

ABSTRACT:
An automatic focusing system adjusts the focus of video camera automatically using the contrast of the Y signal, which is one image input signal. The maximum and minimum values of the Y signal determine the contrast of the Y signal. This contrast value is then compared with the previous contrast value to determine if the focus driving motor should be signalled to rotate in the same direction as previously, a different direction or to stop rotation. Gating means with stored ranges are used to establish the successive detection of the Y signals to allow continuous operation of the auto focus circuit. Thus, the system can always automatically focus without being affected by the peripheral background of object.

REFERENCES:
patent: 4414575 (1983-11-01), Yamamoto et al.
patent: 4422097 (1983-12-01), Inuiya
patent: 4531158 (1985-07-01), Murakami et al.
patent: 4550995 (1985-11-01), Toyama

Affiliated with

Also associated with

Rating

Automatic focusing system of video camera using the contrast cha 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 system of video camera using the contrast cha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing system of video camera using the contrast cha will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-894087