GB2501196A - Auto-focus image system - Google Patents

Auto-focus image system Download PDF

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Publication number
GB2501196A
GB2501196A GB1311752.8A GB201311752A GB2501196A GB 2501196 A GB2501196 A GB 2501196A GB 201311752 A GB201311752 A GB 201311752A GB 2501196 A GB2501196 A GB 2501196A
Authority
GB
United Kingdom
Prior art keywords
edge
auto
image system
generator
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1311752.8A
Other versions
GB201311752D0 (en
Inventor
Hiok-Nam Tay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/IB2010/055641 external-priority patent/WO2011070513A1/en
Application filed by Individual filed Critical Individual
Priority claimed from PCT/IB2011/052529 external-priority patent/WO2012076993A1/en
Publication of GB201311752D0 publication Critical patent/GB201311752D0/en
Publication of GB2501196A publication Critical patent/GB2501196A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals

Abstract

An auto focus image system that includes a pixel array coupled to a focus signal generator. The pixel array captures an image that has a plurality of edges. The generator generates a focus signal that is a function of a plurality of edge-sharpness measures, each one measured from one of the plurality of edges. The generator may determine to reduce a relative extent to which an edge contributes to the focus signal on basis of detecting that the edge does not have sufficient reflection symmetry, according to a predefined criterion, in a sequence of gradients of an image signal across the edge.
GB1311752.8A 2010-12-07 2011-06-09 Auto-focus image system Withdrawn GB2501196A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/IB2010/055641 WO2011070513A1 (en) 2009-12-07 2010-12-07 Auto-focus image system
PCT/IB2011/052529 WO2012076993A1 (en) 2010-12-07 2011-06-09 Auto-focus image system

Publications (2)

Publication Number Publication Date
GB201311752D0 GB201311752D0 (en) 2013-08-14
GB2501196A true GB2501196A (en) 2013-10-16

Family

ID=48999487

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1311752.8A Withdrawn GB2501196A (en) 2010-12-07 2011-06-09 Auto-focus image system

Country Status (2)

Country Link
CN (1) CN103283215B (en)
GB (1) GB2501196A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060078218A1 (en) * 2004-06-07 2006-04-13 Fuji Photo Film Co., Ltd. Image correction apparatus, image correction program storage medium, image correction method, and image correction system
WO2010061250A1 (en) * 2008-11-26 2010-06-03 Hiok-Nam Tay Auto-focus image system
GB2475983A (en) * 2009-12-07 2011-06-08 Hiok Nam Tay Reflection symmetry of gradient profile associated with an edge

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1656511A (en) * 2002-05-24 2005-08-17 皇家飞利浦电子股份有限公司 Unit for and method of calculating a sharpened edge
JP4612814B2 (en) * 2004-07-26 2011-01-12 キヤノン株式会社 Automatic focusing apparatus, control method therefor, and imaging apparatus
EP1624672A1 (en) * 2004-08-07 2006-02-08 STMicroelectronics Limited A method of determining a measure of edge strength and focus
US8264591B2 (en) * 2007-10-22 2012-09-11 Candela Microsystems (S) Pte. Ltd. Method and system for generating focus signal
US8184196B2 (en) * 2008-08-05 2012-05-22 Qualcomm Incorporated System and method to generate depth data using edge detection
KR101278797B1 (en) * 2009-10-02 2013-06-27 더 차이니즈 유니버시티 오브 홍콩 Methods and apparatus for editing images

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060078218A1 (en) * 2004-06-07 2006-04-13 Fuji Photo Film Co., Ltd. Image correction apparatus, image correction program storage medium, image correction method, and image correction system
WO2010061250A1 (en) * 2008-11-26 2010-06-03 Hiok-Nam Tay Auto-focus image system
GB2475983A (en) * 2009-12-07 2011-06-08 Hiok Nam Tay Reflection symmetry of gradient profile associated with an edge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
INGMAR JAHR: "LEXIKON DER INDUSTRIELLEN VERABEITUNG" *

Also Published As

Publication number Publication date
CN103283215A (en) 2013-09-04
CN103283215B (en) 2017-03-08
GB201311752D0 (en) 2013-08-14

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