WO2012172360A3 - Touch-sensitive display devices - Google Patents

Touch-sensitive display devices Download PDF

Info

Publication number
WO2012172360A3
WO2012172360A3 PCT/GB2012/051379 GB2012051379W WO2012172360A3 WO 2012172360 A3 WO2012172360 A3 WO 2012172360A3 GB 2012051379 W GB2012051379 W GB 2012051379W WO 2012172360 A3 WO2012172360 A3 WO 2012172360A3
Authority
WO
WIPO (PCT)
Prior art keywords
camera
light
touch
frame rate
plane
Prior art date
Application number
PCT/GB2012/051379
Other languages
French (fr)
Other versions
WO2012172360A2 (en
Inventor
Gareth John Mccaughan
Paul Richard Routley
Original Assignee
Light Blue Optics Ltd
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
Application filed by Light Blue Optics Ltd filed Critical Light Blue Optics Ltd
Publication of WO2012172360A2 publication Critical patent/WO2012172360A2/en
Publication of WO2012172360A3 publication Critical patent/WO2012172360A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
    • G06F3/0426—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking fingers with respect to a virtual keyboard projected or printed on the surface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/745—Detection of flicker frequency or suppression of flicker wherein the flicker is caused by illumination, e.g. due to fluorescent tube illumination or pulsed LED illumination
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2294—Addressing the hologram to an active spatial light modulator

Abstract

A touch sensitive device, the device comprising: a touch sensor light source to project a plane of light above a surface; a camera directed to capture a touch sense image from a region including at least a portion of said plane of light, said touch sense image comprising light scattered from said plane of light by an object approaching or touching said surface; and a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a lateral location of said object; wherein said signal processor is further configured to: detect when an oscillatory component of ambient light captured by said camera has a frequency different to an integral multiple of a frame rate of said camera; and adjust said frame rate of said camera responsive to said detection to an adjusted frame rate, such that said oscillatory component of said ambient light captured by said camera has a frequency within 10% of an integral multiple of said adjusted frame rate.
PCT/GB2012/051379 2011-06-16 2012-06-15 Touch-sensitive display devices WO2012172360A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB1110157.3 2011-06-16
GBGB1110157.3A GB201110157D0 (en) 2011-06-16 2011-06-16 Touch sensitive display devices
US201161508921P 2011-07-18 2011-07-18
US61/508,921 2011-07-18

Publications (2)

Publication Number Publication Date
WO2012172360A2 WO2012172360A2 (en) 2012-12-20
WO2012172360A3 true WO2012172360A3 (en) 2013-03-07

Family

ID=44357875

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2012/051379 WO2012172360A2 (en) 2011-06-16 2012-06-15 Touch-sensitive display devices

Country Status (2)

Country Link
GB (1) GB201110157D0 (en)
WO (1) WO2012172360A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150334204A1 (en) * 2014-05-15 2015-11-19 Google Inc. Intelligent auto-caching of media
EP3820134A1 (en) 2019-11-06 2021-05-12 Koninklijke Philips N.V. A system for performing ambient light image correction

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US20070153094A1 (en) * 2006-01-05 2007-07-05 Ying Noyes Automatic flicker correction in an image capture device
US20110012866A1 (en) * 2009-07-17 2011-01-20 Microsoft Corporation Ambient correction in rolling image capture system

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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020021287A1 (en) * 2000-02-11 2002-02-21 Canesta, Inc. Quasi-three-dimensional method and apparatus to detect and localize interaction of user-object and virtual transfer device
US20040109069A1 (en) * 2002-12-10 2004-06-10 Michael Kaplinsky Method for mismatch detection between the frequency of illumination source and the duration of optical integration time for imager with rolling shutter
US20070153094A1 (en) * 2006-01-05 2007-07-05 Ying Noyes Automatic flicker correction in an image capture device
US20110012866A1 (en) * 2009-07-17 2011-01-20 Microsoft Corporation Ambient correction in rolling image capture system

Also Published As

Publication number Publication date
WO2012172360A2 (en) 2012-12-20
GB201110157D0 (en) 2011-07-27

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