FOCUS CONTROL APPARATUS, IMAGE CAPTURING APPARATUS, METHOD FOR CONTROLLING FOCUS CONTROL APPARATUS AND STORAGE MEDIUM
First Claim
1. A focus control apparatus comprising:
- a first extraction unit configured to extract frequency components of a first band from a predetermined evaluation area of image data generated by an image capturing unit;
a change unit configured to change the evaluation area based on the frequency components extracted by the first extraction unit, so that the evaluation area after the change is narrower than the evaluation area before the change;
a second extraction unit configured to extract, from the evaluation area after the change, frequency components of a second band that includes a higher band than the first band; and
a calculation unit configured to calculate a focus evaluation value for performing focus control of the image capturing unit based on the frequency components extracted by the second extraction unit.
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Accused Products
Abstract
There is provided a focus control apparatus. A first extraction unit extracts frequency components of a first band from a predetermined evaluation area of image data generated by an image capturing unit. A change unit changes the evaluation area based on the frequency components extracted by the first extraction unit, so that the evaluation area after the change is narrower than the evaluation area before the change. A second extraction unit extracts, from the evaluation area after the change, frequency components of a second band that includes a higher band than the first band. A calculation unit calculates a focus evaluation value for performing focus control of the image capturing unit based on the frequency components extracted by the second extraction unit.
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Citations
12 Claims
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1. A focus control apparatus comprising:
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a first extraction unit configured to extract frequency components of a first band from a predetermined evaluation area of image data generated by an image capturing unit; a change unit configured to change the evaluation area based on the frequency components extracted by the first extraction unit, so that the evaluation area after the change is narrower than the evaluation area before the change; a second extraction unit configured to extract, from the evaluation area after the change, frequency components of a second band that includes a higher band than the first band; and a calculation unit configured to calculate a focus evaluation value for performing focus control of the image capturing unit based on the frequency components extracted by the second extraction unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image capturing apparatus comprising:
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an image capturing unit; a first extraction unit configured to extract frequency components of a first band from a predetermined evaluation area of image data generated by the image capturing unit; a change unit configured to change the evaluation area based on the frequency components extracted by the first extraction unit, so that the evaluation area after the change is narrower than the evaluation area before the change; a second extraction unit configured to extract, from the evaluation area after the change, frequency components of a second band that includes a higher band than the first band; and a calculation unit configured to calculate a focus evaluation value for performing focus control of the image capturing unit based on the frequency components extracted by the second extraction unit.
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11. A method for controlling a focus control apparatus, comprising:
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a first extraction step of extracting frequency components of a first band from a predetermined evaluation area of image data generated by an image capturing unit; a change step of changing the evaluation area based on the frequency components extracted in the first extraction step, so that the evaluation area after the change is narrower than the evaluation area before the change; a second extraction step of extracting, from the evaluation area after the change, frequency components of a second band that includes a higher band than the first band; and a calculation step of calculating a focus evaluation value for performing focus control of the image capturing unit based on the frequency components extracted in the second extraction step.
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12. A non-transitory computer-readable storage medium which stores a program for causing a computer to execute a method for controlling a focus control apparatus, the method comprising:
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a first extraction step of extracting frequency components of a first band from a predetermined evaluation area of image data generated by an image capturing unit; a change step of changing the evaluation area based on the frequency components extracted in the first extraction step, so that the evaluation area after the change is narrower than the evaluation area before the change; a second extraction step of extracting, from the evaluation area after the change, frequency components of a second band that includes a higher band than the first band; and a calculation step of calculating a focus evaluation value for performing focus control of the image capturing unit based on the frequency components extracted in the second extraction step.
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Specification