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Sight tracing method and disabled assisting system using the same

A line-of-sight tracking and line-of-sight direction technology, applied in the input/output of user/computer interaction, vehicle ambulance, patient's chair or special means of transportation, etc., to achieve the effect of small amount of calculation, good real-time performance, and improved accuracy

Inactive Publication Date: 2012-08-22
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

After searching the existing technical literature, it is found that there is no report of a disabled assistance system based on visual tracking technology in China.

Method used

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  • Sight tracing method and disabled assisting system using the same
  • Sight tracing method and disabled assisting system using the same
  • Sight tracing method and disabled assisting system using the same

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Embodiment Construction

[0040] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] Such as figure 1, the image acquisition module includes an infrared light source and a camera. The infrared light sources are four LED lights installed at the four corners of the display screen, the camera is located directly below the center of the screen, and the digital images collected by the camera are input into the sight tracking module.

[0042] Such as figure 2 , the specific implementation steps of the gaze tracking algorithm are as follows:

[0043] Step 1: Image preprocessing

[0044] Step 2: Use the Harr feature to locate the human eye area

[0045] Step 3: Blink Recognition

[0046] Step 4: Detection and judgment of LED reflection bright spots in the pupil

[0047] Step 5: Precise positioning of pupil center

[0048] Step 6: Calculation of line of sight direction

[0049] Wherein the specific implementation step...

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Abstract

The invention discloses a view line tracking method and an assistant system for the handicapped by using the method. The method comprises the steps of image pretreatment, the orientation of a human eye area by utilizing Harr features, blinking recognition, the inspection and judgment of LED reflecting lightspot in pupils, the accurate position of pupil centre, the calculation of view line direction and so on. The system comprises an embedded-like platform, a camera, a display screen and four LED and wheelchair running control modules which are installed at the four corners of the display screen and arranged into a rectangular. The system is an embedded-type system, which carries out blinking inspection, the inspection of the reflecting lightspots against infrared light sources on corneas,the accurate position of the pupil centers and the judgment of view line directions by the camera and a processor, tracks the view line of human eyes and, meanwhile, carries out the recognition of the status of the human eyes by judging the view line directions of the human eyes when gazing on the screen, thus realizing the functions of wheelchair control, music play control, text reading and webpage rolling. The invention is convenient for use and has high accuracy, thereby being capable of bringing great convenience for the lives of the handicapped.

Description

technical field [0001] The visual tracking algorithm in the present invention belongs to the technical field of image processing and pattern recognition, and its application device: the assisting system for the disabled relates to embedded system and single-chip microcomputer technology. Background technique [0002] Human line of sight plays an important role in human-computer interaction, and it has the advantages of being direct, natural and bidirectional. At present, eye-tracking technology has just started and has not yet reached the practical stage. Successful practical projects are rare and expensive, and have high requirements for hardware. Usually, two or more cameras are required, and very high pixels are required. Visual tracking technologies can generally be divided into two categories, contact and non-contact. The contact type has high precision, but the user must wear special equipment, which will bring great discomfort to the user. The non-contact type gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06F3/01A61G5/10
Inventor 秦华标刘婧周贵斌陈昌能
Owner SOUTH CHINA UNIV OF TECH
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