Apparatus for auto-focusing detection, camera applying the same, and method for calculating distance to subject
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04N-005/232
G03B-013/00
H04N-005/225
G03B-009/04
G03B-009/22
H04N-005/357
G03B-009/14
G03B-013/36
G02B-007/34
출원번호
US-0035201
(2011-02-25)
등록번호
US-8823860
(2014-09-02)
우선권정보
KR-10-2010-0026327 (2010-03-24)
발명자
/ 주소
Choi, Woo-Seok
Lee, Jeong-Won
출원인 / 주소
Samsung Electronics Co., Ltd
대리인 / 주소
The Farrell Law Firm, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
An apparatus for auto-focusing detection, a camera applying the same, and a method for calculating a distance to a subject are disclosed. The camera calculates a focusing control state based on synthetic image data output as an image passing through a pupil split unit provided with a filter arranged
An apparatus for auto-focusing detection, a camera applying the same, and a method for calculating a distance to a subject are disclosed. The camera calculates a focusing control state based on synthetic image data output as an image passing through a pupil split unit provided with a filter arranged at one or more of the at least two holes as taken by an image pickup unit.
대표청구항▼
1. A camera comprising: a pupil split unit, which includes at least two holes to split a beam of light passing through an image-taking lens into at least two beams of light;a filter arranged at one of the at least two holes, reducing a quantity of light passing through said one of the holes;an image
1. A camera comprising: a pupil split unit, which includes at least two holes to split a beam of light passing through an image-taking lens into at least two beams of light;a filter arranged at one of the at least two holes, reducing a quantity of light passing through said one of the holes;an image pickup unit taking an image with light passing simultaneously through the at least two holes of the pupil split unit; anda calculation unit calculating a focusing control state based on synthetic image data output as images, which are different in a quantity of light, passing through the at least two holes of the pupil split unit as taken by the image pickup unit,wherein the calculation unit performs a calculation regarding a focusing control direction based on a difference in a quantity of light of each image which is formed as light is split by the at least two holes, andwherein the focusing control direction is used to set a direction in which a focus lens is moved. 2. The camera according to claim 1, wherein the pupil split unit is driven by the same driving source as that of a quantity of light control unit. 3. The camera according to claim 1, wherein the pupil split unit is arranged together with or in a single body with a quantity of light control unit of the camera. 4. The camera according to claim 2, wherein the quantity of light control unit includes a shutter, an iris, or an optical filter or any combination thereof. 5. The camera according to claim 4, wherein the pupil split unit is arranged in the shutter in a single body with the shutter, and the shutter has a shutter open state, a shutter closed state, and a pupil split state. 6. The camera according to claim 4, wherein the pupil split unit is arranged on the iris in a single body with the iris, and the iris is driven to be a closed state when the pupil split unit is opened. 7. The camera according to claim 4, wherein the optical filter is a neutral density (ND) filter, and the pupil split unit is arranged together with the ND filter. 8. The camera according to claim 1, wherein the at least two holes have the same size as each other. 9. The camera according to claim 1, wherein the at least two holes include a first hole and a second hole, and the calculation unit calculates a focusing control direction depending on a position of an image formed by passing through the first hole and a position of an image formed by passing through the second hole. 10. The camera according to claim 1, wherein the at least two holes include a first hole and a second hole, and the calculation unit calculates a defocusing amount by calculating a distance between an image formed by light passing through the first hole and an image formed by light passing through the second hole. 11. The camera according to claim 10, further comprising a driver controlling a driving speed of a focus lens depending on the calculated defocusing amount and moving the focus lens in accordance with the controlled driving speed. 12. The camera according to claim 10, wherein the calculation unit calculates a distance between an image formed by light passing through the first hole and an image formed by light passing through the second hole by using a ghost cancellation scheme. 13. The camera according to claim 1, wherein the filter is a neutral density (ND) filter reducing quantity of light passing through one of the two holes. 14. An apparatus for automatically controlling a focus of a camera, the apparatus comprising: a pupil split unit, which includes at least two holes to split a beam of light passing through an image-taking lens into two beams of light;a filter arranged at one of the at least two holes, reducing a quantity of light passing through said one of the holes; anda calculation unit calculating a focusing control state based on synthetic image data output as images, which are different in a quantity of light, passing through the at least two holes of the pupil split unit, performs a calculation regarding a focusing control direction based on a difference in a quantity of light of each image which is formed as light is split by the at least two holes,wherein the focusing control direction is used to set a direction in which a focus lens is moved. 15. A method for calculating a distance to a subject, the method comprising: taking an image passing through a pupil split unit, which includes at least two holes splitting a beam of light passing simultaneously through an image-taking lens into at least two beams of light, a filter reducing a quantity of light, the filter being arranged at one of the at least two holes, and a calculation unit that determines a location of each phase from a difference in a quantity of light of each phase split through the at least two holes, and calculates a focusing control direction based on the determined location of each phase; andcalculating a distance from the subject to the image-taking lens based on synthetic image data output as images based on a difference in a quantity of light of each image which is formed as the light is split by the at least two holes. 16. The method according to claim 15, wherein the at least two holes include a first hole and a second hole, and the calculating includes: calculating a distance between an image formed by light passing through the first hole and an image formed by light passing through the second hole;calculating a defocusing amount by using the calculated distance;calculating a focal distance of the image-taking lens based on the defocusing amount; andcalculating the distance from the subject to the image-taking lens by using the calculated focal distance, a distance between the image-taking lens and an image pickup unit, and a lens formula.
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이 특허에 인용된 특허 (7)
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