[특허]Focus detection apparatus for interpolating correlation value between two images and self-correlation value of either i

[미국특허] Focus detection apparatus for interpolating correlation value between two images and self-correlation value of either i 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01J-001/20
출원번호	US-0768670 (1996-12-18)
우선권정보	JP-0097421 (1994-05-11)
발명자 / 주소	Yaji Tsuyoshi,JPX
출원인 / 주소	Olympus Optical Co., Ltd., JPX
대리인 / 주소	Frishauf, Holtz, Goodman, Langer & Chick
인용정보	피인용 횟수 : 7 인용 특허 : 9

초록 ▼

A light beam passing a photographing lens is divided into two portions by a mirror in a camera body. One of the two divided light beams is directed to an eyepiece via a screen and pentagonal prism. The other divided light beam is reflected from a mirror and directed to a focus detection optical system constructed by a field view diaphragm, condenser lens, diaphragm mask and re-imaging lens, and an image in position corresponding to the range-finding field view is divided into two images by the optical system. An image sensor is arranged near the re-imaging surface which receives the two images formed by the focus detection optical system to photoelectrically convert a received signal and transfer data to a CPU. The CPU effects the focus detection operation containing the operation of interpolating the value of correlation between the two images by use of the self-correlation value of one of the two images based on detection data and drives the photographing lens to a focused position.

대표청구항 ▼

[ What is claimed is:] [1.] A focus detection apparatus for a camera including photoelectric conversion means for receiving two images formed from a light beam from an object, said photoelectric conversion means having a linear sensor array and outputting two image signals corresponding to the received two images, said focus detection apparatus comprising:first operation means for defining an operation range of the two image signals output by said photoelectric conversion means and for deriving an amount of deviation between the two received images, said operation range being a predetermined fixed size, and said amount of deviation being derived by effecting a correlation operation between the two image signals output from said photoelectric conversion means while shifting the two image signals sequentially at high speed in a predetermined direction in a first cycle, and by effecting the correlation operation in the operation range of the two image signals in a next cycle;second operation means for deriving a self correlation value of one of the two image signals output from said photoelectric conversion means; andthird operation means for interpolating by approximating linear regression an amount of deviation between the two images based on at least a portion yielding a minimum value of an operation result of said first operation means and an operation result of said second operation means.

이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

Akashi Akira (Yokohama JPX) Kadohara Terutake (Yokohama JPX), Automatic focusing apparatus detecting focus for a plurality of areas and using contrast levels.
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Hamada Masataka (Minamikawachi JPX) Ishida Tokuji (Daito JPX) Karasaki Toshihiko (Sakai JPX) Norita Toshio (Sakai JPX) Taniguchi Nobuyuki (Nishinomiya JPX), Focus condition detecting device having correlation calculation means and means for determining the range of shifts of i.
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Goto Hisashi (Yokohama JPX), Focus detecting device having at least three reimaging lenses.
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Kusada Yosuke (Yokohama JPX), Focus detecting device having light distribution detection.
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Hamada Masataka (Osakahayama JPX) Yukawa Kazuhiko (Wakayama JPX) Ishida Tokuji (Daito JPX) Norita Toshio (Yokohama JPX) Ueda Hiroshi (Habikino JPX), Focus detecting photoelectric converting apparatus for a camera.
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Utagawa Ken (Yokohama JPX), Focus detection apparatus.
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Utagawa, Ken, Focus detection apparatus.
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Douglas Larry D. (Copper Canyon TX) Hutchinson ; Jr. Clarence W. (Arlington TX), Neural load disturbance analyzer.
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Tocher Angus J. (Calgary CAX), Self correcting stereoscopic auto-rangefinder.
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이 특허를 인용한 특허 (7) 인용/피인용 타임라인 분석

Iwane Toru,JPX, Autofocus device of a camera and method.
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Marold, Thomas, Autofocusing method for telescopes pertaining to surveying equipment.
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Yoshida,Hideo; Mihara,Yoshikazu, Distance measuring apparatus.
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Leberl, Franz; Gruber, Michael; Ponticelli, Martin, Enhancing digital images using secondary optical systems.
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Leberl, Franz; Gruber, Michael; Ponticelli, Martin, Enhancing digital images using secondary optical systems.
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Masaki Higashihara JP; Masato Ikeda JP, Focusing information detecting device, focus detecting device and camera utilizing the same.
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Ippolito, Kim; Lapets, Oleg; Sipe, Michael; Shopoff, Randall, Method of determining a best initial focal position estimate.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Focus detection apparatus for interpolating correlation value between two images and self-correlation value of either i 원문보기