INTERACTIVE DISPLAY SYSTEM

• US 20140354542A1
• Filed: 11/06/2013
• Published: 12/04/2014
• Est. Priority Date: 05/30/2013
• Status: Abandoned Application

• Current Assignee: National Taiwan University (Government of The Republic of China)
• Original Assignee: National Taiwan University (Government of The Republic of China)
• Inventors: CHANG, Chun-Yen, LIOU, Wei-Kai
• Application Number:
  US14/073,599
• Publication Number:
  US 20140354542A1
• Time in Patent Office: Days
• US Class Current: 345/157
• 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

Abstract

An interactive display system including a data processing unit, a display, a laser pointer, a translucent optical device, an image capture device, and an optical filter is disclosed. The laser pointer projects a laser beam on the translucent optical device attached to or built in a screen of the display. The laser beam has a specified wavelength within a visible light spectrum. The translucent optical device reflects most of the laser beam. The image capture device acquires under the data processing unit a sensed image including a part of a displayed object image within the specified wavelength and the reflected laser beam. The data processing unit determines a position of the laser beam relative to the displayed object image in accordance with light intensity distribution of the sensed image, calculates a distance vector between the determined position and a cursor, and moves the cursor according to the distance vector.

Claims

1. An interactive display system, comprising:

a data processing unit;

a display having a screen configured to communicate with the data processing unit and to display an object image output from the data processing unit on the screen, the object image including a cursor generated by the data processing unit;

a translucent optical unit externally attached to the screen or built in the screen, the translucent optical unit being disposed in front of the screen;

a laser pointer configured to emit a laser beam onto the translucent optical unit, the laser beam having a specified wavelength in visible-light range, wherein the translucent optical unit is capable of reflecting a larger portion of the laser beam;

an image capture device having a lens and configured to communicate with the data processing unit;

an optical filter attached to the lens externally or built in the lens for allowing passage of light beam reflected from the translucent optical unit; and

wherein the image capture device acquires a sensed image retrieved from the image capture device and the data processing unit determines a position of the reflected laser beam with respect to the object image according to light intensity distribution of the sensed image, calculates a distance vector between the position of the reflected laser beam and the cursor, and moves the cursor according to the distance vector, wherein the sensed image including a part of the displayed object image of the specified wavelength and the reflected laser beam.

2. The interactive display system of claim 1, further comprising a wireless command transmitter for transmitting a command in a wireless way to the data processing unit.

3. The interactive display system of claim 2, wherein the wireless command transmitter is integrally formed with the laser pointer.

4. The interactive display system of claim 2, wherein the wireless way is selected from one of the group consisting of 2.4 GHz, Bluetooth, Wi-Fi, audio and infrared.

5. The interactive display system of claim 1, wherein the laser beam is selected from one of the group consisting of red light, green light, orange light, blue light and violet light.

6. The interactive display system of claim 1, wherein the laser pointer includes a light source generating red visible laser light of 3 mW power or less.

7. The interactive display system of claim 1, wherein the laser pointer includes a light source generating green visible laser light of 30 mW power or less.