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JPS6441021A - Picture projection type indication detector - Google Patents

Picture projection type indication detector

Info

Publication number
JPS6441021A
JPS6441021A JP19638387A JP19638387A JPS6441021A JP S6441021 A JPS6441021 A JP S6441021A JP 19638387 A JP19638387 A JP 19638387A JP 19638387 A JP19638387 A JP 19638387A JP S6441021 A JPS6441021 A JP S6441021A
Authority
JP
Japan
Prior art keywords
circuit
picture
coordinate
screen
coordinates
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.)
Granted
Application number
JP19638387A
Other languages
Japanese (ja)
Other versions
JP2977559B2 (en
Inventor
Koichi Takeuchi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP19638387A priority Critical patent/JP2977559B2/en
Publication of JPS6441021A publication Critical patent/JPS6441021A/en
Application granted granted Critical
Publication of JP2977559B2 publication Critical patent/JP2977559B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
  • Position Input By Displaying (AREA)
  • Facsimiles In General (AREA)

Abstract

PURPOSE:To discriminate the patterns produced on a projection screen and to realize the on-line input of the control commands and coordinates, by detecting the difference between the picture information to be projected and that actually shown on the picture protection screen. CONSTITUTION:A pointed part detecting circuit 11 detects the presence of a coordinate position 3 pointed by a coordinate indicator 2 using the light beams based on the difference between the picture signal inputted from a driving circuit 9 and the output signal of a reading circuit 10. A coordinate calculating circuit 12 calculates the relative position of the position 3 within a picture displayed on a screen 1 based on both outputs of the circuit 11 and the circuit 10. A command discriminating circuit 13 detects a time changing pattern of the optical characteristics of the position 3 out of the output of the circuit 11 and discriminates the types of commands. Thus it is possible to realize the on-line input of control commands and coordinates in a state where the information are displayed to many persons just by pointing directly the projected pictures by means of a visible means such as an indicator using light beams, an indication rod, etc.
JP19638387A 1987-08-07 1987-08-07 Image projection type instruction detection device Expired - Fee Related JP2977559B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19638387A JP2977559B2 (en) 1987-08-07 1987-08-07 Image projection type instruction detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19638387A JP2977559B2 (en) 1987-08-07 1987-08-07 Image projection type instruction detection device

Publications (2)

Publication Number Publication Date
JPS6441021A true JPS6441021A (en) 1989-02-13
JP2977559B2 JP2977559B2 (en) 1999-11-15

Family

ID=16356959

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19638387A Expired - Fee Related JP2977559B2 (en) 1987-08-07 1987-08-07 Image projection type instruction detection device

Country Status (1)

Country Link
JP (1) JP2977559B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03179517A (en) * 1989-12-08 1991-08-05 Hitachi Ltd Pointing device device and input method
JPH04260114A (en) * 1990-11-09 1992-09-16 Proxima Corp Method and apparatus for calibrating optical- computer input system
JPH04299727A (en) * 1990-11-02 1992-10-22 Xerox Corp Position and function input system for large display
JPH07503562A (en) * 1992-02-03 1995-04-13 プロクシマ　コーポレイション Calibration arrangement of optical system auxiliary inputs and how to use them
JP2005215214A (en) * 2004-01-28 2005-08-11 Nec Corp Projection display device and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6910778B2 (en) * 2001-09-28 2005-06-28 Fujinon Corporation Presentation system using laser pointer
JP2006163360A (en) 2004-11-11 2006-06-22 Casio Comput Co Ltd Projection apparatus, projection method, and projection control program

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968050A (en) * 1982-09-17 1984-04-17 Canon Inc Raster picture display device
JPS60123038U (en) * 1984-01-24 1985-08-19 株式会社ピ−エフユ− Handwritten information display device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968050A (en) * 1982-09-17 1984-04-17 Canon Inc Raster picture display device
JPS60123038U (en) * 1984-01-24 1985-08-19 株式会社ピ−エフユ− Handwritten information display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03179517A (en) * 1989-12-08 1991-08-05 Hitachi Ltd Pointing device device and input method
JPH04299727A (en) * 1990-11-02 1992-10-22 Xerox Corp Position and function input system for large display
JPH04260114A (en) * 1990-11-09 1992-09-16 Proxima Corp Method and apparatus for calibrating optical- computer input system
JPH07503562A (en) * 1992-02-03 1995-04-13 プロクシマ　コーポレイション Calibration arrangement of optical system auxiliary inputs and how to use them
JP2005215214A (en) * 2004-01-28 2005-08-11 Nec Corp Projection display device and method

Also Published As

Publication number Publication date
JP2977559B2 (en) 1999-11-15

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees