METHOD FOR CALIBRATING AN INTERACTIVE INPUT SYSTEM AND INTERACTIVE INPUT SYSTEM EXECUTING THE CALIBRATION METHOD
First Claim
19. An interactive input system comprising a touch panel and processing structure executing a calibration method, said calibration method determining a transformation between the touch panel and an imaging plane based on known features in a calibration video presented on the touch panel and features located in a calibration image created based on received images of the calibration video.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of calibrating an interactive input system comprises receiving images of a calibration video presented on a touch panel of the interactive input system. A calibration image is created based on the received images, and features are located in the calibration image. A transformation between the touch panel and the received images is determined based on the located features and corresponding features in the calibration video.
-
Citations
27 Claims
-
19. An interactive input system comprising a touch panel and processing structure executing a calibration method, said calibration method determining a transformation between the touch panel and an imaging plane based on known features in a calibration video presented on the touch panel and features located in a calibration image created based on received images of the calibration video.
-
20. A computer readable medium embodying a computer program for calibrating an interactive input device, the computer program comprising:
-
computer program code receiving images of a calibration video presented on a touch panel of the interactive input system; computer program code creating a calibration image based on the received images; computer program code locating features in the calibration image; and computer program code determining a transformation between the touch panel and the received images based on the located features and corresponding features in the calibration video.
-
-
21. A method for determining one or more touch points in a captured image of a touch panel in an interactive input system, comprising:
-
creating a similarity image based on the captured image and an image of the touch panel without any touch points; creating a thresholded image by thresholding the similarity image based on an adaptive threshold; identifying one or more touch points as areas in the thresholded image; refining the bounds of the one or more touch points based on pixel intensities in corresponding areas in the similarity image. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 23, 24, 25)
-
-
23-1. The method of claim 21, further comprising characterizing each touch point as an ellipse having center coordinates.
-
26. An interactive input system comprising a touch panel and processing structure executing a touch point determination method, said touch point determination method determining one or more touch points in a captured image of the touch panel as areas identified in a thresholded similarity image refined using pixel intensities in corresponding areas in the similarity image.
-
27. A computer readable medium embodying a computer program for determining one or more touch points in a captured image of a touch panel in an interactive input system, the computer program comprising:
-
computer program code creating a similarity image based on the captured image and an image of the touch panel without any touch points; computer program code creating a thresholded image by thresholding the similarity image based on an adaptive threshold; computer program code identifying one or more touch points as areas in the thresholded image; computer program code refining the bounds of the one or more touch points based on pixel intensities in corresponding areas in the similarity image.
-
Specification