Touch point sensing method and optical touch system

摘要

A touch point sensing method and an optical touch system are provided. The optical touch system includes a first lens and a second lens. The touch point sensing method includes the following steps. Images including at least two touch objects in a touch detecting area captured by the first lens and the second lens are obtained and analyzed. Based on the obtained images, distance values between the first touch signal group at the first instant and the first and second touch signal groups at the second instant are calculated for determining whether the first and second touch signal groups at the second instant are overlapped. When the first and the second touch signal groups at the second instant are overlapped, locations of the touch signals in the first touch signal groups and in the second touch signal groups are exchanged.

主权项

1. A touch point sensing method, adapted to an optical touch system having a first lens and a second lens, the touch point sensing method comprising steps as follows:
obtaining and analyzing images of at least two touch objects in a touch detecting area captured by the first lens and the second lens; calculating a first touch signal group and a second touch signal group at a first instant and a second instant according to the images, wherein each of the first touch signal group and the second touch signal group comprises locations of two touch signals; calculating a plurality of distance values between the touch signals in the first touch signal group at the first instant and the touch signals in the first touch signal group and the second touch signal group at the second instant, and determining whether the first touch signal group and the second touch signal group are overlapped at the second instant based on the distance values; and when the first touch signal group and the second touch signal group are overlapped at the second instant, exchanging the locations of the touch signals in the first touch signal group and the second touch signal group.