Apparatus allowing remote interactive use of a plurality of writing surfaces

• US 5,025,314 A
• Filed: 07/30/1990
• Issued: 06/18/1991
• Est. Priority Date: 07/30/1990
• Status: Expired due to Fees

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Tang, John C., Minneman, Scott L.
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US07/559,486
• Time in Patent Office: 323 Days
• Field of Search: 358/93, 358/108, 358/84, 358/83, 358/85, 358/496, 358/494, 358/487, 178/18, 178/19, 178/20, 434/307, 434/323, 434/322
• US Class Current: 348/14.08
• CPC Class Codes: G06F 3/0425 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 a projected light spot to determine a position on a display surface G06F3/0386
• CPC Class Codes: H04N 7/142 Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

Remote interactive use of a plurality of writing surfaces, such as special wall mounted whiteboards and the like, is facilitated by an apparatus which includes, for each writing surface, a translucent screen acting as the writing surface itself, a video camera located behind the translucent screen for receiving an image of indications imparted upon the translucent screen, and a video projector for projecting onto the back side of the translucent screen a composite of the images imparted upon each of the translucent screens. Backlighting of a user is employed to allow presentation of the processes of imparting, using and referring to the indicia together with the indicia itself. Proper ambient lighting also provides a limited three dimensional view of the user. Audio portions of interactive work may be captured by a microphone and transmitted to speakers in conjunction with the video portion of the interactive work. An audio/video mixing resource may be employed to combine the images of indicia and audio from various worksites for presentation. Low bandwidth of the present system facilitates compression and use with emerging commercial communications standards (e.g., ISDN).

Claims

1. An apparatus for remote interactive communication, comprising:

first and second writing/display screens, each writing/display screen having a first surface for receiving indicia imparted by a user thereupon and a second surface opposite said first surface for diffusing light incident thereupon;

a first video camera positioned to capture substantially only those images imparted on the first surface of the first writing/display screen by imaging the second surface of the first writing/display screen;

a second video camera positioned to capture substantially only those images imparted on the first surface of the second writing/display screen by imaging the second surface of the second writing/display screen;

a first video projector positioned to project an image onto the second surface of the first writing/display screen;

a second video projector positioned to project an image onto the second surface of the second writing/display screen; and

means for interconnecting the first and second video cameras and video projectors such that an image of indicia imparted by a user upon the first surface of the first writing/display screen is detected by the first video camera and transmitted to the second video projector which projects the image from the first writing/display screen onto the second surface of the second writing/display screen and an image of indicia imparted by a user upon the first surface of the second writing/display screen is detected by the second video camera and transmitted to the first video projector which projects the image from the second writing/display screen onto the second surface of the first writing/display screen to thereby form an optical composite of the images on the first surfaces of the first and second writing/display screens.

2. The apparatus of claim 1, further including means for illuminating a user such that a shadow of the user is imparted onto the first surface of either the first or second writing/display screen when the user is proximate either first surface.

3. The apparatus of claim 1, wherein each said writing/display screen comprises a semitransparent body.

4. The apparatus of claim 1, further including means for capturing and presenting audio communication associated with each said first and second writing/display screens and interconnection means such that audio communication associated with said first writing/display screen is transmitted for presentation at said second writing/display screen and audio communication associated with said second writing/display screen is transmitted for presentation at said first writing/display screen.

5. The apparatus of claim 1, wherein said means for interconnecting the first and second video cameras and video projectors comprises mixing means for producing a composite of inputs from the first and second video cameras which may be projected by said video projectors.

6. The apparatus of claim 1, further including storage means connected to said first and second video cameras for storing the image of indicia imparted by a user and the shadow of the user imparted upon the first surface of both the first and second writing/display screens.

7. The apparatus of claim 1, further including presentation means connected to said first and second video projectors for presenting a selected image for projection upon the second surface of each of said first and second writing/display screens.

8. The apparatus of claim 7, wherein said presentation means includes means for presenting animated prerecorded collaborative work.

9. An apparatus for remote interactive communication, comprising:

first and second writing/display screens, each writing/display screen comprising a semitransparent body having a first surface for receiving indicia imparted by a user thereupon and a second surface opposite said first surface for diffusing light incident thereupon;

a first video camera positioned to capture substantially only those images imparted on the first surface of the first writing/display screen by imaging the second surface of the first writing/display screen;

a second video camera positioned to capture substantially only those images imparted on the first surface of the second writing/display screen by imaging the second surface of the second writing/display screen;

a first video projector positioned to project an image onto the second surface of the first writing/display screen;

a second video projector positioned to project an image onto the second surface of the second writing/display screen;

mixing means for producing a composite of inputs from the first and second video cameras which may be projected by said video projectors such that an image of indicia imparted by a user upon the first surface of the first writing/display screen captured by the first video camera and an image of indicia of imparted by a user upon the first surface of the second writing/display screen captured by the second video camera are combined to form the composite which is transmitted to both the first and second video projectors which project the composite onto the second surface of the first and second writing/display screens;

means for illuminating a user such that a shadow of the user is imparted onto the first surface of either the first or second writing/display screen when the user is proximate either first surface;

storage means connected to said mixing means for storing the composite of indicia imparted by a user and the shadow of the user imparted upon the first surface of both the first and second writing/display screens; and

presentation means connected to said mixing means for presenting a selected image to said mixing means for transmission to the first and second projectors.

10. The apparatus of claim 9, wherein said presentation means includes means for presenting animated prerecorded collaborative work.

11. The apparatus of claim 9, further including means for capturing and presenting audio communication associated with each said first and second writing/display screens and interconnection means such that audio communication associated with said first writing/display screen is transmitted for presentation at said second writing/display screen and audio communication associated with said second writing/display screen is transmitted for presentation at said first writing/display screen.

12. An apparatus for remote interactive communication, comprising:

first and second writing/display screens, each writing/display screen comprising a semitransparent body having a first surface for receiving indicia imparted by a user thereupon and a second surface opposite said first surface for diffusing light incident thereupon;

a first video camera positioned to capture substantially only those images imparted on the first surface of the first writing/display screen by imaging the second surface of the first writing/display screen;

a second video camera positioned to capture substantially only those images imparted on the first surface of the second writing/display screen by imaging the second surface of the second writing/display screen;

a first video projector positioned to project an image onto the second surface of the first writing/display screen;

a second video projector positioned to project an image onto the second surface of the second writing/display screen;

mixing means for producing a composite of inputs from the first and second video cameras which may be projected by said video projectors such that an image of indicia imparted by a user upon the first surface of the first writing/display screen captured by the first video camera and an image of indicia of imparted by a user upon the first surface of the second writing/display screen captured by the second video camera are combined to form the composite which is transmitted to both the first and second video projectors which project the composite onto the second surface of the first and second writing/display screens;

means for illuminating a user such that a shadow of the user is imparted onto the first surface of either the first or second writing/display screen when the user is proximate either first surface;

storage means connected to said mixing means for storing the composite of indicia imparted by a user and the shadow of the user imparted upon the first surface of both the first and second writing/display screens;

presentation means connected to said mixing means for presenting a selected image to said mixing means for transmission to the first and second projectors; and

means for capturing and presenting audio communication associated with each said first and second writing/display screens connected to said mixing means such that audio communication associated with said first writing/display screen is transmitted for presentation at said second writing/display screen is transmitted for presentation at said second writing/display screen and audio communication associated with said second writing/display screen is transmitted for presentation at said first writing/display screen.