IMAGING APPARATUS AND CONTROL METHOD
First Claim
1. An imaging apparatus comprising:
- an imaging unit having a plurality of pixels arranged two-dimensionally and configured to obtain an image of an object by sequentially scanning a plurality of pixels to read out an image signal while moving the position of a focusing lens;
a detection unit to detect an object area in an image obtained by the imaging unit;
a setting unit to set an AF area corresponding to the object area detected by the detection unit; and
a focusing control unit configured to obtain in-focus states of a plurality of images in the AF area set by the setting unit, the plurality of images being captured by the imaging unit, and based on information about the in-focus states, to perform focusing control of the focusing lens,wherein when the object area is larger than a predetermined size, the setting unit sets an AF area which is smaller than an AF area which corresponds to the object area.
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Accused Products
Abstract
In an imaging apparatus, wherein when performing auto focus control while continuously moving a focusing lens by using an image sensor that has a lag in timing of electric charge accumulation, a focusing accuracy can be improved. To this end, the imaging apparatus includes the rolling shutter function, an imaging unit configured to convert an object image into an image signal, and a setting unit. When a difference exceeds a predetermined amount in the barycentric position of the optical system between an upper line and an a lower line of the AF area due to the rolling shutter function, the setting unit imposes a limitation on the AF area to reduce the size of a desired AF area to an AF area where the difference in the barycentric position becomes a predetermined amount.
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Citations
9 Claims
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1. An imaging apparatus comprising:
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an imaging unit having a plurality of pixels arranged two-dimensionally and configured to obtain an image of an object by sequentially scanning a plurality of pixels to read out an image signal while moving the position of a focusing lens; a detection unit to detect an object area in an image obtained by the imaging unit; a setting unit to set an AF area corresponding to the object area detected by the detection unit; and a focusing control unit configured to obtain in-focus states of a plurality of images in the AF area set by the setting unit, the plurality of images being captured by the imaging unit, and based on information about the in-focus states, to perform focusing control of the focusing lens, wherein when the object area is larger than a predetermined size, the setting unit sets an AF area which is smaller than an AF area which corresponds to the object area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control method for an imaging apparatus having an imaging unit including a plurality of pixels arranged two-dimensionally and configured to capture an image of an object by sequentially scanning a plurality of pixels to read out an image signal from each pixel while moving the position of a focusing lens, and configured to perform focusing control of the imaging apparatus by taking a plurality of images of an object while moving a position of a focusing lens, and obtaining in-focus states in the AF areas set in the plurality of images, the method comprising:
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detecting the object areas in the images; and setting AF areas associated with the object areas. wherein when an object area is larger than a predetermined size, a smaller AF area than the AF area corresponding to the object area is set.
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Specification