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Improved identification method for infrared interactive touch spot

An identification method and contact technology, which is applied in the field of contact identification, can solve the problems that cannot meet the accuracy requirements of identification, and the infrared light is difficult to be uniform, and achieve the effects of small tangential distortion, reduced error, and small radial distortion

Inactive Publication Date: 2013-05-08
YANCHENG INST OF TECH
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AI Technical Summary

Problems solved by technology

[0004] Due to the influence of external ambient light and noise, there will be spots in the captured image based on DI technology, and the infrared illumination is difficult to be uniform. Even if multi-camera splicing is adopted, it is difficult to obtain a good recognition effect at the edge of the display screen.
In this specific environment, existing contact recognition solutions cannot meet the recognition accuracy requirements, and new methods are needed to solve this problem

Method used

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  • Improved identification method for infrared interactive touch spot
  • Improved identification method for infrared interactive touch spot
  • Improved identification method for infrared interactive touch spot

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Embodiment Construction

[0052] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0053] figure 1 It is a flowchart of the algorithm of the present invention. exist figure 1 In , when the program starts, the camera coordinates are first positioned on the screen. After the accurate coordinate position is obtained through calibration, the background frame is collected, and then the image frame is continuously collected and subtracted from the background frame to obtain a difference image. After processing the difference image by smoothing, high-pass filtering, image enhancement, etc., the dynamic parameter method is used to detect the touch point of the screen boundary, and then the binarization denoising process is performed, so that an image containing many bright spot areas can be obtained. The contact detection and identification are based on the symmetrical method, and the contact information is sent to the upper l...

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Abstract

Disclosed is an improved identification method for an infrared interactive touch spot. The improved identification method for the infrared interactive touch spot comprises the following steps: (1) coordinate setting is carried out for a camera based on consistency of random sampling; five groups of point correspondence relationships are randomly sampled in a set S, a projection matrix HC corresponding to the five groups of point correspondence relationships is counted out, when a consistent set CC of the HC surpasses a preset threshold value T, then the current point correspondence relationships in the consistent set meet requirements of ideal point correspondence relationships; otherwise, the step is repeated until the consistent set meets the requirements; according to the point correspondence relationships in the consistent set, a final projection matrix H is counted out through direct linear transformation; (2) screen border touch spot detection is carried out through a dynamic parameter method.

Description

technical field [0001] The invention relates to a contact recognition method, in particular to a contact recognition method suitable for an infrared multi-touch interactive system. Background technique [0002] As a new type of human-computer interaction system, the multi-touch interactive system can be controlled by computer users through several fingers without traditional input devices. This brand-new interaction method establishes a natural interaction interface between man and machine, realizes multi-point and multi-user interaction with the environment directly at the same time, and enhances user experience. In order to enable users to obtain a good interactive experience, it is necessary to track and identify touch points accurately and quickly, so touch point recognition technology is the key to the realization of interactive systems. [0003] At present, the contact recognition technologies based on computer vision mainly include: laser planar technology (LLP), fru...

Claims

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Application Information

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IPC IPC(8): G06F3/042
Inventor 王吉林夏菽兰陈荣纪正飚卞金洪周锋孙干超王如刚
Owner YANCHENG INST OF TECH
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