Patent ID: 9285927
Filing Date: 2016-03-15
CPC Classification: G06F

Claim Text:
1. An exposure mechanism of an optical touch system, the optical touch system comprising a plurality of image sensors and a plurality of active light sources, each of the active light sources irradiating corresponding to the associated image sensor, the exposure mechanism comprising: 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 comprises 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, using a processing unit, a differential image between the bright image and the dark image captured by each of the image sensors, wherein the sampling intervals of a part of the working modes are not identical and the denoising sampling interval is equal to a shortest sampling interval of the sampling intervals.