Patent Document ID: 9841846
Application ID: 14991062
Patent Status: 1

Claim One:
1. An optical touch system, comprising: a touch surface; a plurality of reflection light bars disposed on edges of the touch surface, respectively; a first image sensor configured to capture image frames looking across the touch surface in a first sampling interval and a denoising sampling interval to respectively obtain a first bright image and a first dark image; a first active light source configured to irradiate corresponding to the first sampling interval; a second image sensor configured to capture image frames looking across the touch surface in a second sampling interval and the denoising sampling interval to respectively obtain a second bright image and a second dark image, wherein the first sampling interval is longer than the second sampling interval; a second active light source configured to irradiate corresponding to the second sampling interval; and a processing unit configured to calculate a first differential image between the first bright image and the first dark image, and calculate a second differential image between the second bright image and the second dark image.