发明名称 |
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. |
申请公布号 |
US9285927(B2) |
申请公布日期 |
2016.03.15 |
申请号 |
US201314052520 |
申请日期 |
2013.10.11 |
申请人 |
PIXART IMAGING INC. |
发明人 |
Kao Ming-Tsan;Su Tzung-Min;Lin Chih-Hsin |
分类号 |
G06F3/041;G06F3/042 |
主分类号 |
G06F3/041 |
代理机构 |
Hauptman Ham, LLP |
代理人 |
Hauptman Ham, LLP |
主权项 |
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. |
地址 |
Hsin-Chu County TW |