IMAGING APPARATUS DETECTING FOREIGN OBJECT ADHERING TO LENS
First Claim
1. An imaging apparatus, comprising:
- an imaging unit having an imaging surface on which an optical image of a subject field passing through a lens is emitted, which generates an image signal corresponding to the optical image of the subject field by photoelectric conversion;
an aperture control unit which controls an aperture of said lens;
a shutter unit which controls exposure time for said imaging unit;
an exposure adjustment unit which adjusts an exposure value for said imaging surface based on an evaluation value of brightness of the subject field;
a focus adjustment unit which adjusts a focus position of said lens; and
a foreign object detection unit which detects a foreign object adhering to said lens by performing shooting under a plurality of shooting conditions in which the exposure value and the focus position are identical and aperture values are different from each other, and comparing a plurality of the image signals obtained from said imaging unit during said shooting.
1 Assignment
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Accused Products
Abstract
An imaging element having an imaging surface on which an optical image of a subject field passing through an optical lens is emitted generates an image signal corresponding to the optical image of the subject field by photoelectric conversion. An aperture mechanism controls an aperture of the optical lens. A shutter controls exposure time for the imaging element. An exposure adjustment unit adjusts an exposure value for the imaging surface based on an evaluation value of brightness of the subject field. A focus adjustment unit adjusts a focus position of the optical lens. A CPU detects a foreign object adhering to the optical lens by performing shooting under a plurality of shooting conditions in which the exposure value and the focus position are identical and aperture values are different from each other, and comparing a plurality of the image signals obtained from the imaging element during the shooting.
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Citations
6 Claims
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1. An imaging apparatus, comprising:
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an imaging unit having an imaging surface on which an optical image of a subject field passing through a lens is emitted, which generates an image signal corresponding to the optical image of the subject field by photoelectric conversion; an aperture control unit which controls an aperture of said lens; a shutter unit which controls exposure time for said imaging unit; an exposure adjustment unit which adjusts an exposure value for said imaging surface based on an evaluation value of brightness of the subject field; a focus adjustment unit which adjusts a focus position of said lens; and a foreign object detection unit which detects a foreign object adhering to said lens by performing shooting under a plurality of shooting conditions in which the exposure value and the focus position are identical and aperture values are different from each other, and comparing a plurality of the image signals obtained from said imaging unit during said shooting. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification