Focus detecting apparatus and image pick-up apparatus having the same
AssigneeSamsung Electronics Co., Ltd.
InventorsShitao DENG, Kyongtae Park
Life of this patent
Estimating the term…
Abstract
Disclosed are a focus detecting apparatus capable detection in various light illumination conditions and an image acquiring apparatus having the same. The focus detecting apparatus may include a mark disposed on a primary image plane. A pair of images of the mark is detected by a sensor, the distance between which images is used to determine the main wavelength of the light received from a subject. The main wavelength is used in determining the chromatic aberration correction by which the defocus amount may be adjusted.
Claims18
A focus detecting apparatus for use in an image pick-up apparatus, comprising:
- a mark arranged on a primary image plane;
- a sensor unit on which a pair of images of the subject and a pair of images of the mark are formed;
- a primary defocus computing unit configured to compute a primary defocus amount according to a distance between the pair of images of the subject;
- a wavelength detecting unit configured to determine a main wavelength of light entering the image pick-up apparatus according to a distance between the pair of images of the mark;
- a correction computing unit configured to compute a chromatic aberration correction amount according to the main wavelength determined by the wavelength detecting unit;
- and
- a secondary defocus computing unit configured to add the chromatic aberration correction amount to the primary defocus amount to obtain a final defocus amount.
An image pick-up apparatus, comprising:
- a lens unit configured to focus light received from a subject;
- a focus detecting apparatus configured to detect a focus state of the lens unit;
- and
- an image pickup area exposed to the light received from the subject,
- wherein the focus detecting apparatus comprises:
- a mark arranged on a primary image plane;
- a sensor unit on which a pair of images of the subject and a pair of images of the mark are formed;
- a primary defocus computing unit configured to compute a primary defocus amount according to a distance between the pair of images of the subject;
- a wavelength detecting unit configured to determine a main wavelength of light entering the image pick-up apparatus according to a distance between the pair of images of the mark;
- a correction computing unit configured to compute a chromatic aberration correction amount according to the main wavelength determined by the wavelength detecting unit;
- and
- a secondary defocus computing unit configured to add the chromatic aberration correction amount to the primary defocus amount to obtain a final defocus amount.
An apparatus for detecting a state of focus of an image acquiring apparatus that acquires an image of a subject by receiving light from the subject, comprising:
- a mark arranged on a primary image plane;
- one or more image sensors arranged in an optical path of the light such that the one or more image sensors receive a pair of images of the mark, the one or more image sensors being configured to output an electrical signal representative of the pair of images of the mark;
- and
- a focus operation controller having an input through which to receive the electrical signal output by the one or more image sensors, the focus operation controller being configured to determine a main wavelength associated with the light based on a distance between the pair of images of the mark, the focus operation controller being further configured to determine the state of focus based at least in part on the determined main wavelength.
Dependencies are inferred from the claim text.