EXPOSURE MECHANISM OF OPTICAL TOUCH SYSTEM AND OPTICAL TOUCH SYSTEM USING THE SAME

摘要

An exposure mechanism of an optical touch system, which includes a plurality of image sensors and a plurality of active light sources each irradiating corresponding to the associated image sensor, includes: capturing image frames using the image sensors with a sampling cycle to allow each of the image sensors to capture a bright image, wherein the sampling cycle includes a plurality of working modes and in each of the working modes at least one of the image sensors captures the bright image in a sampling interval; simultaneously capturing a dark image using all the image sensors in a denoising sampling interval; and calculating a differential image between the bright image and the dark image captured by each image sensor.

主权项

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; 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 right image and the first dark image, andcalculate a second differential image between the second bright image and the second dark image.