Title:
オートフォーカス制御装置および方法、記録媒体、並びにプログラム
Document Type and Number:
Japanese Patent JP4029296
Kind Code:
B2
Abstract:
The present invention allows for increasing an autofocus-response characteristic. An image-pickup sensor makes exposures ex 11 and ex12 (Fig. 7C) in synchronization with a video-vertical-synchronization signal VP1 (Fig. 7A). A camera-signal processing unit reads video signals obtained through the exposures ex11 and ex12 at timings VR12 and VR 21, respectively (Fig. 7D). An AF-detection unit captures a high-frequency component of a video signal corresponding to an AF-detection-reduction gate frame (hereinafter simply referred to as a gate frame) at the timing of the gate frame, rectifies and detects the high-frequency component, and generates a focus-evaluation value immediately after the gate-frame timing. An AF module captures a plurality of the focus-evaluation values at the timing of an AF module AF 2 (Fig. 7F), generates an autofocus-control signal LD3 which brings a focus position near to a focusing position (Fig. 7G), and moves a focus lens on the basis of the autofocus-control signal LD3. The present invention can be used for a video camera.
Inventors:
Sakae Okazaki
Nakamura Mabi
Nakamura Mabi
Application Number:
JP2004057298A
Publication Date:
January 09, 2008
Filing Date:
March 02, 2004
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G03B13/36; H04N5/232; G02B7/28; G02B7/36
Domestic Patent References:
| JP5107451A | ||||
| JP7170439A | ||||
| JP4318978A |
Attorney, Agent or Firm:
Yoshio Inamoto