Touch system for blue screen

• US 8,264,468 B1
• Filed: 06/19/2008
• Issued: 09/11/2012
• Est. Priority Date: 06/19/2007
• Status: Expired due to Fees

• Current Assignee: Imaging Systems Technology Incorporated
• Original Assignee: Imaging Systems Technology Incorporated
• Inventors: Pavliscak, Thomas J., Wedding, Carol Ann, Kurtz, Victoria W., Afzal, Rebecca L.
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Rodriguez, Joseph G
• Application Number:
  US12/141,949
• Time in Patent Office: 1,545 Days
• Field of Search: 345/17
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• 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 19/162 User input
• CPC Class Codes: H04N 9/75 Chroma key

Abstract

A touch input system comprising a chroma-key/matte display system with a calibrated touch input near or on a matte.

Claims

1. In a display system comprising a video display, a video camera, a chroma-key device, and a matte backdrop having a display area within a field of view of the video camera,

the improvement wherein the matte display area is provided with a touch input device having a touch area,

said touch input device being positioned such that the touch area of the device is in a fixed location with reference to the matte display area,

said matte display area containing fiducial marks at pre-determined locations within the touch area,

images being generated on the video display with the video camera, the chroma-key device, and the matte backdrop,

the touch input device being calibrated with the images on the video display using the fiducial marks in the matte display area.

2. The invention of claim 1 wherein the touch input device is an IR touch system device.

3. The invention of claim 1 wherein the fiducial marks comprise two or more compatible shades of chroma-key/matte colors in a specific pattern of alignment stripes physically in a viewing surface of the chroma-key/matte backdrop.

4. A method of calibrating a touch system comprising a chroma-key device, a camera, a video display, a matte backdrop having a display area within a field of view of the camera, and a touch input device having an active touch area wherein the touch input device is positioned such that the active touch area of the touch device is in a fixed location with reference to the display area of the matte backdrop, which comprises placing fiducial marks at predetermined locations within the matte display area and the active area of the touch screen, generating a composite image on the video display with the video camera, the chroma-key device and the matte backdrop, and calibrating the touch input device with the images on the video display using the fiducial marks on the matte display area.

5. The invention of claim 4 wherein predetermined locations of the matte are touched, said locations corresponding to locations on the composite image for calibration of the touch input device.

6. The invention of claim 4 wherein fiducial marks consist of two or more compatible shades of chroma-key/matte colors in a specific pattern of alignment stripes physically on the chroma-key/matte backdrop surface.

7. The invention of claim 4 wherein the touch input device is an JR touch system device.