TOUCH SYSTEM AND POINTER COORDINATE DETECTION METHOD THEREFOR
First Claim
Patent Images
1. A pointer height detection method for a touch system, comprising the steps of:
- capturing an image window looking across a plate surface with at least one image sensor;
calculating a variation of each column of pixels in the image window; and
comparing the variation of at least one column of pixels with the smallest variation in the image window and at least one threshold to indentify a height of a pointer relative to the plate surface.
1 Assignment
0 Petitions
Accused Products
Abstract
A pointer coordinate detection method for a touch system includes the steps of: capturing an image window looking across a plate surface with at least one image sensor; identifying a height coordinate of a pointer relative to the touch system according to a variation of each column of pixels in the image window; and calculating a plane coordinate of the pointer relative to the touch system according to an image position of the pointer in the image window. The present invention further provides a touch system.
-
Citations
23 Claims
-
1. A pointer height detection method for a touch system, comprising the steps of:
-
capturing an image window looking across a plate surface with at least one image sensor; calculating a variation of each column of pixels in the image window; and comparing the variation of at least one column of pixels with the smallest variation in the image window and at least one threshold to indentify a height of a pointer relative to the plate surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A pointer coordinate detection method for a touch system, comprising the steps of:
-
capturing an image window looking across a plate surface with at least one image sensor; identifying a height coordinate of a pointer relative to the touch system according to a variation of each column of pixels in the image window; and calculating a plane coordinate of the pointer relative to the touch system according to an image position associated with the pointer in the image window. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A touch system, comprising:
-
a plate, having a plate surface; at least one light source, illuminating the plate along the plate surface; at least one reflecting unit, configured to reflect light from the light source; at least one image sensor, configured to capture an image window containing an image of a pointer blocking the reflecting unit; and a processing unit, processing the image window and identifying a height coordinate of the pointer relative to the plate surface according to a variation of each column of pixels in the image window. - View Dependent Claims (19, 20, 21, 22, 23)
-
Specification