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Adaptive hierarchical structure light-based touch detection system and method

A layered structure and structured light technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problem of low accuracy and stability of touch recognition, flickering or image quality degradation, and difficult hardware Implementation and other issues, to achieve the effect of easy hardware implementation, solving flickering or image quality degradation, and improving stability

Active Publication Date: 2013-10-02
TSINGHUA UNIV
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  • Summary
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  • Application Information

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Problems solved by technology

[0005] The invention aims at the traditional object touch recognition method based on the projection unit and the image sensing unit system, which has complex algorithms, large amount of calculation, difficult hardware implementation, low touch recognition accuracy and stability, and flickering of implicitly embedded structured light Or the problem of image quality degradation, a touch detection system and method based on adaptive layered structured light

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  • Adaptive hierarchical structure light-based touch detection system and method
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  • Adaptive hierarchical structure light-based touch detection system and method

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Embodiment 1

[0047] The touch detection system based on adaptive layered structured light in the present invention includes: a projection unit, an image sensing unit, a control unit and a touch detection unit. Wherein, the projection unit can be a projector with image projection function, the image sensing unit can be an image sensor with image acquisition function, and the control unit and touch detection unit can be composed of embedded processing unit, application specific integrated circuit unit or computer.

[0048] The projection unit, as the output display device of the system, projects the interface image containing structured light onto the projection surface for imaging; the projection surface can be a plane suitable for user touch operations such as desktops, walls, books, and projection screens;

[0049] An image sensing unit, as an image acquisition device of the system, is used to take images of the projection area;

[0050] The control unit transmits control commands through...

Embodiment 2

[0060] As shown in Figure 1(b), the touch detection unit, as the core unit of the system, includes a structured light generation module in addition to the structured light extraction module and the structured light information processing module. The structured light generation module can embed structured light in the original interface image according to the current position of the touch object and the distance information from the projection surface fed back by the structured light information processing module, and then transmit it to the projection unit; at the same time, the module also The size, shape and position information of embedded structured light can be generated and sent to the structured light extraction module;

[0061] In this embodiment, the original human-computer interaction interface image received by the system does not contain obvious feature information. The structured light generation module in the touch detection unit will implicitly embed structured ...

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Abstract

The invention provides an adaptive hierarchical structure light-based touch detection system and method. The system comprises a touch detection unit, a projection unit, an image sensing unit and a control unit, wherein the touch detection unit is used for receiving original interface image data from the exterior of the system, receiving a projection region image data photographed by the image sensing unit and processing the image data, and acquiring and outputting touch information of a touched object; the projection unit is used for projecting an original interface image to a projection plane to image; the image sensing unit is used for acquiring and outputting the projection region image data; and the control unit is used for controlling ordered cooperative work between every two units and controlling the synchronization between the projection unit and the image sensing unit. By using a structure light three-dimensional measurement principle, the distance between the touched object and the projection plane can be accurately measured, and the measurement precision and the touch detection accuracy are guaranteed; the amount of calculation of structure light generation and extraction is reduced; and the problem of flickering of hidden embedded structure light or image quality reduction is effectively solved.

Description

technical field [0001] The invention relates to the technical field of optical three-dimensional measurement and projection type human-computer interaction, and in particular to a touch detection system and method based on adaptive layered structured light. Background technique [0002] As a kind of non-contact measurement technology, optical three-dimensional measurement technology obtains the three-dimensional coordinate information of the object surface by using the interaction between the optical signal and the object surface. The advantage of simplicity. Among them, the structured light method is to project a certain pattern of light onto the surface of the three-dimensional object to be measured through an optical projector such as a projection unit, so that the image sensor can obtain the structured light information modulated by the surface of the object, and use the triangulation principle to calculate the three-dimensional information. It is a typical method in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 谢翔任力飞李昂韩衍隽李国林胡军吕众宋玮郑毅王志华
Owner TSINGHUA UNIV
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