Invention Grant
- Patent Title: Electronic camera that adjusts a distance from an optical lens to an imaging surface so as to search the focal point
- Patent Title (中): 调整从光学透镜到成像面的距离的电子照相机,以搜索焦点
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Application No.: US12197713Application Date: 2008-08-25
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Publication No.: US08077252B2Publication Date: 2011-12-13
- Inventor: Kohei Fukugawa , Kazuhiro Tsujino
- Applicant: Kohei Fukugawa , Kazuhiro Tsujino
- Applicant Address: JP Moriguchi-shi
- Assignee: SANYO Electric Co., Ltd.
- Current Assignee: SANYO Electric Co., Ltd.
- Current Assignee Address: JP Moriguchi-shi
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2007-220357 20070827
- Main IPC: H04N5/232
- IPC: H04N5/232 ; G03B13/00

Abstract:
An electronic camera includes an image sensor having an imaging surface for capturing an object scene through a focus lens. When the object scene captured by the imaging surface includes a face portion of a human, a CPU designates, as a focal-point search area a first imaging area for covering an outline of the face portion. The CPU also designates, as a frequency-component detection area, a second imaging area that is smaller than the first imaging area and is for capturing an inner side of the outline of the face portion. Subsequently, the CPU obtains a high-frequency AF evaluation value and a mid-frequency AF evaluation value detected corresponding to the frequency-component detection area, and designates, as a lens moving range, a range different depending upon a relative ratio between the high-frequency AF evaluation value and the mid-frequency AF evaluation value. Thereafter, the CPU moves the focus lens within a designated range, and references a partial image generated on the imaging surface in a manner to correspond to the focal-point search area so as to search a focal point for the face portion.
Public/Granted literature
- US20090059059A1 Electronic Camera Public/Granted day:2009-03-05
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