In focus detecting apparatus having a plurality of bandpass filt

Details In focus detecting apparatus having a plurality of bandpass filt In focus detecting apparatus having a plurality of bandpass filt

1989-08-31

1990-12-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, H04N 5232

Patent

active

049807730

ABSTRACT:
An in-focus detecting apparatus has a plurality of band pass filters of different frequency pass bands. A video signal from an image pickup device is supplied to these band pass filters and a degree of in-focus of a photographing optical system is detected by an output of each of the band pass filters. This apparatus has a filter switching circuit to sequentially select the outputs of the band pass filters at a field period. Every time each of the band pass filters is selected, the peak value of the output of the selected band pass filter is compared with the preceding peak value which was previously selected to thereby obtain the differential value. The focus adjustment is performed on the basis of the output signal of the band pass filter having the maximum differential value.

REFERENCES:
patent: 4414575 (1983-11-01), Yamamoto et al.
patent: 4853788 (1989-08-01), Murashima et al.
patent: 4871906 (1989-10-01), Ueda et al.

Affiliated with

Also associated with

Rating

In focus detecting apparatus having a plurality of bandpass filt does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with In focus detecting apparatus having a plurality of bandpass filt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In focus detecting apparatus having a plurality of bandpass filt will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1167429