Interactive video system
First Claim
1. Apparatus for an interactive video system, comprising:
- a transmissive projection screen, wherein the transmissive projection screen comprises a front surface located on a front side and a rear surface located on an opposing rear side and is such that an image projected on to the rear surface at a predetermined angle is visible from the front side but substantially not visible from the rear side;
a projector positioned to the rear side of the transmissive projection screen to project display images on to the rear surface of the transmissive projection screen at the predetermined angle; and
a video camera positioned to video, through the transmissive projection screen, a first user positioned to the front side of the transmissive projection screen.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus for an interactive video system comprising a transmissive projection screen (8) from which an image projected on to the rear surface is visible from the front side but not visible from the rear side, a projector (20) to project display images on to the rear surface of the screen (8); and a video camera (22) positioned to video a user (2) in front of the screen (8). The user (2) effects a writing action on the screen (8) using a dry pen (24) comprising infrared LEDs (64) which operate when the dry pen (24) is pressed against the screen (8). These emissions are detected and position decoded, and a corresponding image projected on the screen (8) so it appears as direct writing to the user (2). The videoed image of the user and the input written data may be combined and transmitted during a videoconference to corresponding apparatus used by a further user (4) who thereby sees interaction between the first user (2) and the written data.
46 Citations
28 Claims
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1. Apparatus for an interactive video system, comprising:
- a transmissive projection screen, wherein the transmissive projection screen comprises a front surface located on a front side and a rear surface located on an opposing rear side and is such that an image projected on to the rear surface at a predetermined angle is visible from the front side but substantially not visible from the rear side;
a projector positioned to the rear side of the transmissive projection screen to project display images on to the rear surface of the transmissive projection screen at the predetermined angle; and
a video camera positioned to video, through the transmissive projection screen, a first user positioned to the front side of the transmissive projection screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- a transmissive projection screen, wherein the transmissive projection screen comprises a front surface located on a front side and a rear surface located on an opposing rear side and is such that an image projected on to the rear surface at a predetermined angle is visible from the front side but substantially not visible from the rear side;
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16. A digital whiteboard system, comprising:
- a dry pen arranged to emit output signals when pressed against a surface;
a transmissive projection screen, wherein the transmissive projection screen comprises a front surface located on a front side and a rear surface located on an opposing rear side and is such that an image projected on to the rear surface at a predetermined angle is visible from the front side but substantially not visible from the rear side;
a detector for detecting output signals emitted when the dry pen is pressed against the front surface of the transmissive projection screen;
a position decoder for determining where on the front surface of the transmissive projection screen the dry pen is being pressed; and
a projector for projecting an image on to the rear surface of the transmissive projection screen at the predetermined angle, the image representing writing corresponding to the positions the dry pen is pressed on the front surface. - View Dependent Claims (17, 18, 19, 20)
- a dry pen arranged to emit output signals when pressed against a surface;
- 21. A dry pen for a digital whiteboard system, comprising one or more infrared LEDs arranged to emit infrared signals when the dry pen is pressed against a surface.
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25. (canceled)
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26. (canceled)
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27. (canceled)
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28. (canceled)
Specification