Projection screen based touch positioning method and system

Abstract

The present invention discloses a projection screen based touch positioning method. The method comprises the following steps: starting a camera on a depth sensor to obtain image information of a touch object on a front side of a projection plane projected by a projection device, and starting the depth sensor to obtain depth information of the touch object; obtaining three-dimensional touch point coordinates of the touch object based on the image information and depth information of the touch object; and when it is determined that the three-dimensional touch point coordinates of the touch object locate in an effective touch space on the front side of the projection plane, responding to a corresponding operation according to the three-dimensional touch point coordinates of the touch object. The present invention further discloses a projection screen based touch positioning system. According to the method and system disclosed by the embodiments of the present invention, on the premise of ensuring touch precision, a touch on a flat surface can be implemented, and requirements of a flatness level of the target wall are relatively low, so that a touch operation on any touch object can be implemented.

Description

technical field [0001] The present invention relates to the field of touch technology, in particular to a projection screen-based touch positioning method and system. Background technique [0002] At present, the touch technology of the projection solution is mainly divided into a solution based on electromagnetic technology and a solution based on a touch frame, wherein the touch frame includes an infrared touch frame and an optical touch frame. [0003] Among them, based on the electromagnetic technology, through an external pen, it can interact with the electromagnetic panel to realize the calculation of the touch coordinates. The method based on the touch frame is to align the projection plane to the touch frame, realize the touch coordinate calculation through the touch frame, and synchronize to the projection coordinate system. [0004] The touch technology of the existing projection scheme has the following defects: the characteristic of the technology based on elect...

AI Technical Summary

Problems solved by technology

[0004] The touch technology of the existing projection scheme has the following defects: the characteristic of the technology based on electromagnetic is that the user needs a specific external signal pen to realize the touch, and there are restrictions on the touch object; the technology based on the touch frame needs to mount the touch frame On the wall plane, and ensure that the projection plane just covers the touch plane in the touch frame, the touch frame will protrude from the wall to sense the touch object, and the appearance is poor; in addition, it is difficult for the projection plane to completely coincide with the touch plane of the touch frame , which affects the touch accuracy; finally, the way of the touch frame also has higher requirements on the flatness of the target wall, otherwise it will cause problems such as insensitivity to touch or touch failure

Images