Optical touch system, method of touch detection, and computer program product

摘要

An optical touch system is provided. At least one light source is disposed at a side of a base plane. A first optical sensor and a second optical sensor detect a space in front of the base plane to generate a first signal and a second signal. When two groups of objects approach to or touch the base plane, a processing unit determines at least one first portion of the first signal corresponding to the two groups of the objects and at least one second portion of the second signal corresponding to the two groups of the objects, and converts the at least one first portion and the at least one second portion into a plurality of touch regions, and determines group transformations according to positions corresponding to at least part of touch regions. Additionally, a method of touch detection, and a computer program product are also provided.

主权项

1. An optical touch system, configured to determine a group transformation when two groups of objects approach to or touch a base plane, the optical touch system comprising:
at least one light source, disposed at a side of the base plane, and emitting a light beam towards the base plane; a first optical sensor, disposed at a side of the base plane, and detecting a space in front of the base plane to generate a first signal; a second optical sensor, disposed at a side of the base plane, and detecting the space in front of the base plane to generate a second signal, wherein a position of the first optical sensor is different to a position of the second optical sensor; and a processing unit, receiving the first signal and the second signal, wherein when the two groups of the objects approach to or touch the base plane, the processing unit determines at least one first portion of the first signal corresponding to the two groups of the objects and at least one second portion of the second signal corresponding to the two groups of the objects, the processing unit converts the at least one first portion and the at least one second portion into a plurality of possible touch regions in a two-dimensional space, and the processing unit determines the group transformation according to positions corresponding to at least a part of the possible touch regions, wherein the processing unit determines whether the number of approaching or touching positions of the two groups of the objects on the base plane is greater than or equal to 5, and if yes, the processing unit determines that the two groups of the objects approach to or touch the base plane, and determines the at least one first portion of the first signal corresponding to the two groups of the objects and the at least one second portion of the second signal corresponding to the two groups of the objects by using a clustering algorithm.