Title:
AUTOMATIC FOCUSSING DEVICE
Document Type and Number:
Japanese Patent JPH04267210
Kind Code:
A
Abstract:
PURPOSE:To provide a automatic focussing device which can rapidly detect a position to be focused even though no object having a high contrast is present in a designated area. CONSTITUTION:In an automatic focusing device comprising a pick-up lens 1 driven mainly by a motor 8, an image pick-up element 2, an image processing circuit 3 and a BPF circuit 5 for extracting a contrast value of an object to be picked up, an area having a high contrast value, adjacent to a designated area to be focused from which a peak value of contrast values cannot be detected, is automatically selected, instead of the a designated area.
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Inventors:
KOBAYASHI KAZUYA
Application Number:
JP2884091A
Publication Date:
September 22, 1992
Filing Date:
February 22, 1991
Export Citation:
Assignee:
OLYMPUS OPTICAL CO
International Classes:
G02B7/28; G03B13/36; H04N5/232; (IPC1-7): G02B7/28; G03B13/36; H04N5/232
Attorney, Agent or Firm:
Susumu Ito