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Touch detecting system for projection screen

A technology of projection screen and touch detection, which is applied to the parts of TV system, camera body, color TV parts, etc. It can solve the problems of system detection failure, wrong judgment, and system indistinguishability, etc.

Inactive Publication Date: 2006-11-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But this kind of system has a fatal shortcoming: when the content of the picture on the projection screen moves, the system cannot distinguish which areas of movement are caused by the user's waving of the arm, and those areas are caused by the content of the picture
At this time, a wrong judgment will occur, causing the system to fail to detect.

Method used

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  • Touch detecting system for projection screen
  • Touch detecting system for projection screen

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0018] Such as figure 1 As shown, the touch detection system applied to the projection screen provided by the present invention includes a metal projection screen 1; a front polarizing filter 2 of the camera; a camera 3; a front polarizing filter 4 of the projector; a projector 5 ; image acquisition unit 6; wherein camera 3 collects the image of metal projection screen 1, due to the interaction of camera front polarizing filter 2 and polarizing filter 4, the picture thrown by projector 5 is in camera 3 Therefore, when the camera 3 detects the movement of the user's hand in front of the metal projection screen 1 , it will not be disturbed by the picture projected by the projector 5 .

[0019] Among them, the metal projection screen 1 is any kind of projection screen that can maintain the reflective performance of polarized light. The reflective performance of...

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Abstract

The present invention relates to a touch detection system used in projection screen. It includes projecting machine, projection screen, image acquisition unit and image processing unit. The described projecting machine includes a general projecting machine and a polarized light filter mounted in the front end of said projecting machine for regulating direction, the described projection screen is a metal screen, the described image acquisition unit includes adjustable polarized light filter and camera and the described image processing unit can utilize the collected image to trigger further operation.

Description

technical field [0001] The invention relates to a human-computer interaction device, in particular to a touch detection system applied to a projection screen. Background technique [0002] In large-scale exhibition projects, it is often necessary to implement a large-area touchable interactive system. Generally, such systems use projectors as display devices to project images to specific areas. This method is very different from the original screen display method, so that the original touch detection technology for the display cannot be used in this case. To solve this problem, a method based on image area motion detection is generally used to realize touch interaction. The specific implementation process of this method is: a camera is set up in the environment, and images of the projected screen area are captured by the camera. When a user swings his arm in the projection screen area, the camera subtracts the two consecutive images captured by the camera to obtain a motio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B17/54G06F3/14G06F13/00H04N5/232
Inventor 翁冬冬刘越王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY