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특허 상세정보

Focus detection device and accompanying optical equipment

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) G01B-009/06   
미국특허분류(USC) 250/201.8 ; 396/080 ; 396/104 ; 396/128
출원번호 US-0611697 (1996-03-06)
우선권정보 JP-0047299 (1995-03-07)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Sidley & Austin
인용정보 피인용 횟수 : 16  인용 특허 : 7
초록

Where a person is being photographed, for example, both light from the person located at closer range and light from the background located farther away enter the photodetector elements. Where the contrast of the background is high, the rate at which the information from the background contributes to the focus detection becomes larger, which hinders accurate focus detection with regard to the person. In this case, the focus detection device divides a predetermined focus area into smaller areas and detects focus condition in each smaller area.

대표
청구항

[ What is claimed is:] [1.] A focus detection device, including an optical system which forms first and second images, and a sensor having photodetector elements which detect said first and second images, for detecting a focus condition of an objective lens based on a relative position between said first and second images, said device comprising:a first focus detector which divides said first image into plural areas and detects a first relative distance between said first and second images;a second focus detector which divides one of said areas into smal...

이 특허를 인용한 특허 피인용횟수: 16

  1. Stentiford, Frederick W M. Analysis of patterns. USP2009117620249.
  2. Stentiford, Frederick W M. Anomaly recognition method for data streams. USP2009067546236.
  3. Matsumoto Hisayuki,JPX. Automatic focusing device of camera having highly reliable movement prediction feature. USP1999075930532.
  4. Stentiford, Frederick W M. Comparing patterns. USP2009087570815.
  5. Stentiford, Frederick W M. Comparison of patterns. USP2009087574051.
  6. Nakahara Naoto,JPX ; Sato Takuma,JPX ; Kosako Kosei,JPX. Distance measuring apparatus. USP2001076263164.
  7. Iwane, Toru. Focus detecting apparatus and imaging apparatus having center position detection of micro lenses in micro lens array. USP2012088237097.
  8. Oikawa,Makoto. Focus detection based on an opening pupil ratio. USP2009017474352.
  9. Stentiford, Frederick W M. Image analysis relating to extracting three dimensional information from a two dimensional image. USP2012038135210.
  10. Stentiford, Frederick W M. Image filtering based on comparison of pixel groups. USP2010017653238.
  11. Sugiura,Koichi; Itoh,Kei. Imaging apparatus and imaging method. USP2007107283736.
  12. Nakamura Kenji,JPX ; Kageyama Kazumi,JPX ; Tanaka Yoshito,JPX. Measurement device. USP2000066081672.
  13. Anderson,Eric C.. Method and system for improving image quality of portrait images using a focus zone shift. USP2006097106376.
  14. Shilston, Robert T; Stentiford, Frederick W M. Method for focus control. USP2011108040428.
  15. Stentiford, Frederick W M. Searching images. USP2009097593602.
  16. Stentiford, Frederick W. M.. Visual attention system. USP2005086934415.