Automatic focusing apparatus

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

358227, G03B 1300

Patent

active

049909479

ABSTRACT:
An automatic focusing apparatus comprises a photographic optical system for forming an optical image of an object, an optical system driving circuit for moving the photographic optical system in a direction of its optical axis, a storage circuit for prestoring a plurality of MTF ratios corresponding to a plurality of focusing states of the photographic optical system, an image sensor for detecting the optical image, a spatial frequency component extracting circuit for extracting a plurality of spatial frequency components from image signals output from the image sensor, a calculating circuit for calculating a ratio between spatial frequency components representing different focusing states at every common frequency from the spatial frequency components extracted by the spatial frequency extracting circuit, a defocus detecting circuit for detecting a defocus amount and a focusing direction from the spatial frequency component ratios calculated by the calculating circuit and the MTF ratios stored in the storage circuit, and a driving control circuit for calculating an amount and a direction of movement of the photographic optical system from the detection result from the defocus circuit, and outputting the calculating result to the optical system driving circuit.

REFERENCES:
patent: 4561749 (1985-12-01), Utagawa
patent: 4812636 (1989-03-01), Kusaka et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Automatic focusing apparatus 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 apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing apparatus will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-13113

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.