Invention Grant
US08077252B2 Electronic camera that adjusts a distance from an optical lens to an imaging surface so as to search the focal point 失效
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

Electronic camera that adjusts a distance from an optical lens to an imaging surface so as to search the focal point
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.
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