Patent ID: 8982101
Filing Date: 2015-03-17
Classification: G06F

Abstract:
1. An optical touch system, comprising: a camera, having a lens and an image sensor to capture an image of a touch object on the image sensor through the lens; an active light source for lighting the touch object; a processor for determining the distance between the touch object and the camera according to the size or brightness of the image on the image sensor, determining the direction of the touch object according to the position of the image on the image sensor, and calculating the position of the touch object; and a touch interface where the touch object performs a touch operation, wherein the camera is disposed at a periphery of the touch interface such that a field of view of the camera covers any position on the touch interface, and when the processor determines the distance between the touch object and the camera according to the size of the image on the image sensor, the following equation is used: wherein D