Camera
First Claim
1. A camera, comprising:
- an image-capturing element that captures a subject image through a photographic lens having a focusing lens;
an evaluation value calculation unit that calculates focus evaluation values at a plurality of lens positions assumed by the focusing lens based upon an image-capturing signal output by the image-capturing element;
a weighting unit that weights the focus evaluation values calculated by the evaluation value calculation unit in correspondence to the lens positions of the focusing lens assumed when the focus evaluation values are calculated respectively; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the weighted focus evaluation values.
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Accused Products
Abstract
A camera includes: an image-capturing element that captures a subject image through a photographic lens having a focusing lens; an evaluation value calculation unit that calculates focus evaluation values at a plurality of lens positions assumed by the focusing lens based upon an image-capturing signal output by the image-capturing element; a weighting unit that weights the focus evaluation values calculated by the evaluation value calculation unit in correspondence to the lens positions of the focusing lens assumed when the focus evaluation values are calculated respectively; and a focusing operation unit that performs a focusing operation for the photographic lens based upon the weighted focus evaluation values.
45 Citations
22 Claims
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1. A camera, comprising:
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an image-capturing element that captures a subject image through a photographic lens having a focusing lens;
an evaluation value calculation unit that calculates focus evaluation values at a plurality of lens positions assumed by the focusing lens based upon an image-capturing signal output by the image-capturing element;
a weighting unit that weights the focus evaluation values calculated by the evaluation value calculation unit in correspondence to the lens positions of the focusing lens assumed when the focus evaluation values are calculated respectively; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the weighted focus evaluation values. - View Dependent Claims (2, 3, 4, 5)
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6. A camera, comprising:
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an image-capturing element that captures a subject image through a photographic lens;
an evaluation value calculation unit that calculates focus evaluation values each in correspondence to one of a plurality of focus detection areas that include a central focus detection area set at a center of an image-capturing area at the image-capturing element, based upon image-capturing signals individually output from the image-capturing element each in correspondence to one of the plurality of focus detection areas;
a weighting unit that applies a greater weight to a focus evaluation value corresponding to the central focus detection area in a portrait photographing mode; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the focus evaluation values corresponding to the plurality of focus detection areas that have been weighted.
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7. A camera, comprising:
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an image-capturing element that captures a subject image through a photographic lens;
an evaluation value calculation unit that calculates focus evaluation values each in correspondence to one of a plurality of focus detection areas that include a central focus detection area set at a center of an image-capturing area at the image-capturing element, based upon image-capturing signals individually output from the image-capturing element each in correspondence to one of the plurality of focus detection areas;
an attitude detection unit that detects a camera attitude;
a weighting unit that weights the plurality of focus detection areas in conformance to results of a detection performed by the attitude detection unit; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the focus evaluation values corresponding to the plurality of focus detection areas that have been weighted. - View Dependent Claims (8)
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9. A camera, comprising:
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an image-capturing element that captures a subject image through a photographic lens;
an evaluation value calculation unit that calculates focus evaluation values each in correspondence to one of a plurality of focus detection areas set within an image-capturing plane, based upon image-capturing signals individually output from the image-capturing element each in correspondence to one of the plurality of focus detection areas;
a weighting unit that weights the focus evaluation values corresponding to the focus detection areas in conformance to MTF (modulation transfer function) characteristics of the photographic lens respectively; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the focus eva1luation values that have been weighted. - View Dependent Claims (10, 11)
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12. A camera, comprising:
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an image-capturing element that captures a subject image through a photographic lens;
an evaluation value calculation unit that calculates focus evaluation values each in correspondence to one of a plurality of focus detection areas set within an image-capturing plane, based upon image-capturing signals individually output from the image-capturing element each in correspondence to one of the plurality of focus detection areas; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the focus evaluation values, wherein;
sizes of the focus detection areas are set in advance in conformance to MTF (modulation transfer function) characteristics of the photographic lens. - View Dependent Claims (13)
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14. A camera, comprising:
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an image-capturing element that captures a subject image through a photographic lens;
an evaluation value calculation unit that calculates focus evaluation values each in correspondence to one of a plurality of focus detection areas set within an image-capturing plane, based upon image-capturing signals individually output from the image-capturing element each in correspondence to one of the plurality of focus detection areas;
a setting unit that sets sizes of the focus detection areas in conformance to MTF (modulation transfer function) characteristics of the photographic lens; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the focus evaluation values. - View Dependent Claims (15, 16)
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17. A camera comprising:
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an image-capturing element that captures a subject image through a photographic lens;
a filter circuit that allows a predetermined spatial frequency band in individual image-capturing signals output by the image-capturing element each in correspondence to a plurality of focus detection areas set within an image-capturing plane, to pass;
an evaluation value calculation unit that calculates focus evaluation values based upon signals having passed through the filter circuit; and
a focusing operation unit that engages the photographic lens in a focusing operation based upon the focus evaluation values, wherein;
the predetermined spatial frequency band is set in advance for each of the focus detection areas in conformance to MTF (modulation transfer function) characteristics of the photographic lens. - View Dependent Claims (18)
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19. A camera comprising:
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an image-capturing element that captures a subject image through a photographic lens;
a filter circuit that allows predetermined spatial frequency bands in individual image-capturing signals output by the image-capturing element each in correspondence to a plurality of focus detection areas set within an image-capturing plane, to pass;
an evaluation value calculation unit that calculates focus evaluation values based upon signals having passed through the filter circuit;
a setting unit that respectively sets the predetermined spatial frequency bands for the focus detection areas in conformance to MTF (modulation transfer function) characteristics of the photographic lens; and
a focusing operation unit that performs a focusing operation for the photographic lens based upon the focus evaluation values. - View Dependent Claims (20, 21)
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22. A camera comprising:
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a lens mounting unit at which an exchangeable lens having MTF (modulation transfer function) information is detachably mounted;
a detection unit that detects the MTF information at the exchangeable lens mounted at the lens mounting unit;
an image-capturing element that captures a subject image through the exchangeable lens mounted at the lens mounting unit;
an evaluation value calculation unit that calculates focus evaluation values each in correspondence to one of a plurality of the focus detection areas set within an image-capturing plane, based upon image-capturing signals individually output from the image-capturing element each in correspondence to one of the plurality of focus detection areas;
a weighting unit that weights the focus evaluation values each corresponding to one of the focus detection areas based upon the MTF information detected by the detection unit; and
a focusing operation unit that performs a focusing operation based upon the focus evaluation values that have been weighted.
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Specification