Imaging apparatus and distance measurement method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04N-005/232
G06K-009/40
출원번호
US-0522057
(2011-11-16)
등록번호
US-8698943
(2014-04-15)
우선권정보
JP-2010-257227 (2010-11-17)
국제출원번호
PCT/JP2011/006373
(2011-11-16)
§371/§102 date
20120713
(20120713)
국제공개번호
WO2012/066774
(2012-05-24)
발명자
/ 주소
Isogai, Kuniaki
Kawamura, Takashi
Kimura, Masayuki
출원인 / 주소
Panasonic Corporation
대리인 / 주소
Wenderoth, Lind & Ponack, LLP.
인용정보
피인용 횟수 :
2인용 특허 :
5
초록▼
An imaging apparatus includes: an imaging unit; a focal range control unit configured to cause the imaging unit to capture a first image and a second image which have mutually different focal ranges, changing a focal position of the imaging unit; a reference image generation unit configured to gener
An imaging apparatus includes: an imaging unit; a focal range control unit configured to cause the imaging unit to capture a first image and a second image which have mutually different focal ranges, changing a focal position of the imaging unit; a reference image generation unit configured to generate, using the first image and the second image, a reference image to be used as a blur standard; and a distance measurement unit configured to measure a distance to the subject based on a difference in blur degrees between the reference image and each of the first image and the second image. The focal ranges of the first image and the second image are independent of each other, and an out-of-focus space is provided between the focal ranges.
대표청구항▼
1. An imaging apparatus comprising: an imaging unit configured to image a subject to generate an image;a focal range control unit configured to cause the imaging unit to capture n images having mutually different focal ranges, changing a focal position of the imaging unit, where n is an integer grea
1. An imaging apparatus comprising: an imaging unit configured to image a subject to generate an image;a focal range control unit configured to cause the imaging unit to capture n images having mutually different focal ranges, changing a focal position of the imaging unit, where n is an integer greater than or equal to 2;a reference image generation unit configured to generate, using the n imaged, a reference image to be used as a blur standard; anda distance measurement unit configured to measure a distance to the subject based on a difference in blur degrees between the reference image and each of the n images,wherein the focal ranges of the n images are independent of each other, andan out-of-focus space is provided between the focal ranges. 2. The imaging apparatus according to claim 1, wherein the imaging unit includes:an imaging device; anda lens which collects light into the imaging device, andthe focal range control unit is configured to change the focal position by changing a distance between the imaging device and the lens at a constant speed. 3. The imaging apparatus according to claim 2, wherein the n images have a same exposure-time period. 4. The imaging apparatus according to claim 2, wherein the focal range control unit is configured to change the distance between the imaging device and the lens at the constant speed during a time period from initiation to completion of the imaging of the n images by the imaging unit. 5. The imaging apparatus according to claim 1, wherein the imaging unit includes:a lens;n imaging devices arranged to have mutually different optical path lengths from the lens; anda beam splitter which splits a light beam from the lens into light beams for the respective n imaging devices, andthe focal range control unit is configured to cause the n imaging devices to simultaneously capture the respective n images, changing the focal positions of the n imaging devices simultaneously, during a same time period. 6. The imaging apparatus according to claim 1, wherein the imaging unit includes:a lens;n imaging devices; anda selection unit configured to allow a light beam from the lens to selectively enter one of the n imaging devices, andthe focal range control unit is configured to sequentially select the n imaging devices, and to cause the selection unit to allow the light beam to selectively enter the selected imaging device, thereby causing each of the n imaging devices to capture a corresponding one of the n images. 7. The imaging apparatus according to claim 1, wherein the reference image generation unit is configured to generate an average image of the n images, and to generate the reference image using the average image. 8. The imaging apparatus according to claim 7, wherein the reference image generation unit is configured to generate the reference image by performing, on the average image, a deconvolution operation by a single point spread function. 9. A distance measurement method performed using an imaging apparatus which includes an imaging unit configured to image a subject to generate an image, the distance measurement method comprising: causing the imaging unit to capture n images having mutually different focal ranges, changing a focal position of the imaging unit, where n is an integer greater than or equal to 2;generating, using the n images, a reference image to be used as a blur standard; andmeasuring a distance to the subject based on a difference in blur degrees between the reference image and each of the n images,wherein the focal ranges of the n images are independent of each other, andan out-of-focus space is provided between the focal ranges. 10. A non-transitory computer-readable recording medium which holds a program for causing a computer to execute the distance measurement method according to claim 9.
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이 특허에 인용된 특허 (5)
Nayar Shree ; Noguchi Minori,JPX ; Wantanabe Masahiro,JPX, Apparatus and methods for determining the three-dimensional shape of an object using active illumination and relative blurring in two-images due to defocus.
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