EP1004070A2 - Bilderzeugungssystem mit einem bildschirm und mittel zur bildmässigen mischung mit einem empfangenen benutzerbild - Google Patents

Bilderzeugungssystem mit einem bildschirm und mittel zur bildmässigen mischung mit einem empfangenen benutzerbild

Info

Publication number
EP1004070A2
EP1004070A2 EP99919477A EP99919477A EP1004070A2 EP 1004070 A2 EP1004070 A2 EP 1004070A2 EP 99919477 A EP99919477 A EP 99919477A EP 99919477 A EP99919477 A EP 99919477A EP 1004070 A2 EP1004070 A2 EP 1004070A2
Authority
EP
European Patent Office
Prior art keywords
image
mixing
user input
camera
user
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Withdrawn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
EP99919477A
Other languages
English (en)
French (fr)
Inventor
Henricus W. J. Van Den Wildenberg
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP99919477A priority Critical patent/EP1004070A2/de
Publication of EP1004070A2 publication Critical patent/EP1004070A2/de
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/006Details of the interface to the display terminal
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00Aspects of display data processing
    • G09G2340/12Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
    • G09G2340/125Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels wherein one of the images is motion video

Definitions

  • the invention relates to a information presentation system as recited in the preamble of Claim 1.
  • a system has been disclosed in US Patent 5,448,263.
  • user interaction is effected on a touch sensitive surface, which same surface is being used for thereon projecting the application generated image.
  • this system is expensive, and furthermore, the range of allowable types of input informations is restricted to those that have been defined for the touch sensitive surface. For example, no colour signals may be inputted and various rendering techniques such as hatching, underlining text and various others are virtually impossible to implement. Also, motion may be inputted only in a very limited and incremental manner.
  • the inventor has recognized a growing need for a low cost-and easy-to-use system for allowing to input a broad gamut of user defined image based signalizations.
  • User functionalities such as offered by a so-called overhead projector would be a boon.
  • Such overhead projector allows in fact the viewing of printed paper, instant writing with a felt pen, and even small objects. In case of a computer-generated image, the instantaneous adding thereto of handwritten notes would be welcomed.
  • Figure 2 a block diagram of a Mixed Mode Document Camera.
  • Figure 1 shows an overview of an inventive information presentation system. It is based on computer 64 with keyboard 66 which is loaded with an application program.
  • the application may be presented by memory 62, network 60, or by other means.
  • the application can generate an image that is displayed on screen 76 through projection subsystem 74, that operates in front projection. However, rear projection would be feasible as well in a slightly different configuration.
  • the projection subsystem is fed by image-wise mixer subsystem 68 that is fed by the computer at left.
  • the system has camera 70 that captures a user image, such as one produced independently on sheet 72.
  • the camera-generated image is also sent to mixer subsystem 68, so that the overall image on screen 76 is a composite or mixed one.
  • FIG. 70 is a block diagram of a Mixed Mode Document Camera embodiment according to the invention.
  • a VGA or similar composite output signal from the computer is received on interface 20, which has a line duration of about 32 microsecs.
  • the signal inter alia comprises a horizontal sync signal on line 28 and a vertical sync signal on line 24.
  • the line frequency is divided by a factor of 2 to get the line time about equal to the standard television line time of some 64 microsecs.
  • Other standards would require other adaptations.
  • the upper part of the arrangement mainly comprises camera module 22, that may be of a commercially available type Philips VCM 3300 as described in the brochure Monochrome Cameras & Modules published by Philips Electronics N.V. Eindhoven, The Netherlands. This module has a resolution of 768*492 pixels. Vertical sync is at 16 millisecs and horizontal at 64 microsecs. Colour modules would operate in a similar manner, which has not been described for brevity. Module 22 serves for preparing the camera image for mixing with the VGA signal.
  • camera module 22 receives Horizontal and Vertical Sync signals, as well as detection signals from H/V sync detector 30. If the latter are present indeed, camera synchronization is on external, but otherwise on internal. Camera output is a conventional Color Video Blanking & Sync signal. Horizontal and Vertical Sync signals from the input interface 20 are sent to output VGA interface 32.
  • Block 34 receives the CVBS signal from block 22 and the divided-by-2 Horizontal Sync for in a standard procedure precorrecting against vignetting and other causes of non-uniform image illumination.
  • block 36 is an A/D converter for allowing a more convenient processing of the camera output.
  • Block 38 contains a FIFO storage facility.
  • processing mechanisms such as changing the relative size of the camera image, changing the image colour, black-white inverting, filtering text through a text recognition feature, converting to another computer display standard, or converting of the camera image to emulate a computer- generated image may be executed here as well, through providing an appropriate amount of processing facilities. Also, software controlled mixing of driver level images may be done here. By themselves, the necessary facilities are conventional.
  • the output signals from FIFO 38 are reconverted to analog in D/A block 40 and presented to analog mixer module 44 that also comprises a fast switch for effecting changeover between the two image inputs.
  • Block 44 operates under control from block 42 that contains a control circuit and a mode switch. A user may herein select between various modes that will be elucidated hereinafter.
  • the composite mixed signal from block 44 is sent along line bundle 46 to output VGA interface 32, for being displayed on an appropriate projection display device.
  • the above system may have the following extra features.
  • the mixing may as recited be video mixing.
  • a more refined embodiment may have software controlled driver level image mixing, wherein certain properties of the respective images may influence the actual mixing mechanism parameters.
  • a contrast detector may be present for measuring camera contrast.
  • the contrast may be enhanced for the camera image, as well as for the computer generated image.
  • camera letters may be inverted before mixing to white-on-black. If the computer image is predominantly in a particular color, the camera image may be amended to not include this color.
  • Various operational modes are as follows.
  • a high quality text mode the computer signal is inverted as soon as the camera views dark text. This allows representing written camera text at high contrast without interfering with VGA-generated contrast.
  • a second mode is graphical that adds VGA signal and camera signal together. Further, this mode allows to vary the respective intensities of the two signals.
  • a preferred packaging combines the camera with the electronic circuitry necessary for effecting the present invention in a Mixed Mode Document Camera.
  • the camera has Autocontrast filtering control for allowing the use of various different types of writing pens and or paper.
  • Four main modes are possible: 1.
  • VGA image mode blocks camera image.
  • Text mode displays text in preference over the VGA image, through using the above fast switch.
  • Graphical mode mixes the camera image, for example a photograph, through the VGA image.
  • Camera mode blocks the VGA image and displays only camera image. Further modes are feasible, such as dividing screen area into subscreens, each thereof allowing a respective different mode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Digital Computer Display Output (AREA)
  • Image Processing (AREA)
  • Studio Devices (AREA)
EP99919477A 1998-05-27 1999-05-25 Bilderzeugungssystem mit einem bildschirm und mittel zur bildmässigen mischung mit einem empfangenen benutzerbild Withdrawn EP1004070A2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99919477A EP1004070A2 (de) 1998-05-27 1999-05-25 Bilderzeugungssystem mit einem bildschirm und mittel zur bildmässigen mischung mit einem empfangenen benutzerbild

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP98201776 1998-05-27
EP98201776 1998-05-27
PCT/IB1999/000935 WO1999061975A2 (en) 1998-05-27 1999-05-25 A system for image generation with screen means and means for image-wise mixing with a received user image
EP99919477A EP1004070A2 (de) 1998-05-27 1999-05-25 Bilderzeugungssystem mit einem bildschirm und mittel zur bildmässigen mischung mit einem empfangenen benutzerbild

Publications (1)

Publication Number Publication Date
EP1004070A2 true EP1004070A2 (de) 2000-05-31

Family

ID=8233769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99919477A Withdrawn EP1004070A2 (de) 1998-05-27 1999-05-25 Bilderzeugungssystem mit einem bildschirm und mittel zur bildmässigen mischung mit einem empfangenen benutzerbild

Country Status (4)

Country Link
EP (1) EP1004070A2 (de)
JP (1) JP2002517018A (de)
KR (1) KR20010022282A (de)
WO (1) WO1999061975A2 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01295854A (ja) * 1988-05-25 1989-11-29 Canon Inc 印刷装置
US5239373A (en) * 1990-12-26 1993-08-24 Xerox Corporation Video computational shared drawing space
CA2058219C (en) * 1991-10-21 2002-04-02 Smart Technologies Inc. Interactive display system
US5608872A (en) * 1993-03-19 1997-03-04 Ncr Corporation System for allowing all remote computers to perform annotation on an image and replicating the annotated image on the respective displays of other comuters
US5528263A (en) * 1994-06-15 1996-06-18 Daniel M. Platzker Interactive projected video image display system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9961975A2 *

Also Published As

Publication number Publication date
WO1999061975A8 (en) 2000-05-18
WO1999061975A3 (en) 2000-02-17
KR20010022282A (ko) 2001-03-15
JP2002517018A (ja) 2002-06-11
WO1999061975A2 (en) 1999-12-02

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