Image pickup apparatus

• US 5,905,530 A
• Filed: 02/07/1996
• Issued: 05/18/1999
• Est. Priority Date: 08/24/1992
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hamano, Hiroyuki, Tamekuni, Yasuhiro, Kato, Takashi, Suzuki, Masaharu, Yokota, Hideo, Azusawa, Katsumi, Sato, Hidekage
• Primary Examiner(s): Garber, Wendy
• Assistant Examiner(s): Vu, Ngoc-Yen, VU, NGOC YEN T
• Application Number:
  US08/598,140
• Time in Patent Office: 1,196 Days
• Field of Search: 348/207, 348/345, 348/347, 348/333, 348/240, 348/241, 348/151, 348/169, 348/187, 348/231, 348/360, 348/578, 348/222, 348/224, 348/228, 348/358, 348/369, 354/400, 354/402, 369/680, 369/708
• US Class Current: 348/240.99
• CPC Class Codes: H04N 23/635 Region indicators; Field of view indicators
• CPC Class Codes: H04N 23/69 Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
• CPC Class Codes: H04N 23/81 for suppressing or minimising disturbance in the image signal generation
• CPC Class Codes: H04N 25/61 the noise originating only from the lens unit, e.g. flare, shading, vignetting or "cos4"
• CPC Class Codes: H04N 5/2628 Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation

Abstract

An image pickup apparatus is disclosed which is provided with a distortional-aberration memorizing element for memorizing distortional-aberration information about an objective lens, a state-of-objective-lens detecting circuit for detecting a state of the objective lens, an image correcting circuit for reading out distortional-aberration information about distortional aberration occurring during photography from the distortional-aberration memorizing element on the basis of information supplied from the state-of-objective-lens detecting circuit, and electrically correcting a distortion of an image due to the objective lens with a predetermined image height in a photographed image selected as a datum.

Claims

1. An image pickup apparatus comprising:

an image pickup device for generating an electrical signal from an optical image formed by a zoom lens;

aberration information memorizing means for memorizing distortional aberration information about the zoom lens;

focal length detection means for detecting a focal length of the zoom lens; and

signal processing means for processing the electrical signal based on the distortional aberration information and the focal length so as to correct distortional aberration based on a center of an image plane when the zoom lens is in a predetermined focal length zone, and to correct the distortional aberration based on an arbitrary image height when the zoom lens is not in the predetermined focal length zone.