Eye-gaze tracking method based on double light sources

An eye-tracking, dual-light source technology, applied in multimedia signal processing and video fields, can solve the problems of complex calculation and limited head movement range, and achieve the effect of low computational complexity, natural and comfortable experimental process, and easy implementation.

Inactive Publication Date: 2011-05-04
SHANDONG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing dual-light source line-of-sight tracking method is complex in calculation and highly restrictive to the range of head movement, the pre...

Method used

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  • Eye-gaze tracking method based on double light sources
  • Eye-gaze tracking method based on double light sources
  • Eye-gaze tracking method based on double light sources

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Experimental program
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Embodiment Construction

[0030] The hardware system for implementing the eye-tracking method based on dual light sources of the present invention is as figure 1 As shown, including a grayscale camera, two infrared light sources and a personal computer. The personal computer adopts 2.60GHZ Pentium dual-core, and the computer screen size is 34×27cm (width×height). A grayscale camera with a resolution of 694×1040 is installed under the computer. The position of the camera remains unchanged during the experiment. A 1-watt infrared light source L is installed in the lower right corner 1 and L 2 . The tester sits at a position 60--70cm away from the screen, and the head can move within the range of 20×20×10cm (width×length×depth).

[0031] figure 2 A flow chart of the line-of-sight tracking method based on dual light sources of the present invention is given. According to the process, the specific implementation steps are as follows:

[0032] 1. Determine the coordinates of the center of the reflecti...

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Abstract

The invention discloses an eye-gaze tracking method based on double light sources, comprising the following steps: (1) image preprocessing: based on the pupil and reflecting point gray level difference principle, preprocessing an acquired face image, extracting two reflecting points and pupil areas from the face image, and calculating the coordinates of the two reflecting points and the pupil center in an image coordinate system; (2) fixation point estimating: determining the apparent position of a fixation point on a screen based on that a triangle composed of the pupil center and two reflecting points in the image and an triangle composed of the fixation point and two infrared light supplies on the screen approximately are a pair of homothetic triangles; and (3) fixation point correcting: acquiring the final position of the fixation point. The method provided by the invention has the advantages that the distance between people and the screen is not required to be measured, the complexity of computation is low, the robustness for head motion is strong, the experimentation is nature and comfort, and the error of estimation is within the permissible range for the application error of the eye-gaze tracking system; and the method is easy for implementation.

Description

technical field [0001] The invention relates to a line-of-sight tracking method based on dual light sources, and belongs to the technical field of video and multimedia signal processing. Background technique [0002] With the rapid development of computer science and technology and industry, the number of ordinary computer users has increased rapidly, and intelligent human-computer interaction has also attracted increasing attention. As an important way for human beings to obtain external information, sight can also exert its great potential in intelligent human-computer interaction and become an effective tool for intelligent interaction. For example, we can express our subjective thoughts through the line of sight and realize direct manipulation of external things [0003] In 1989, T. Hutchinson et al. first proposed the idea of ​​interacting with computers by sight. Its attractive application prospects have attracted countless researchers at home and abroad to study gaz...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T7/00G06F3/01
Inventor 孙建德杨彩霞刘琚张杰杨晓晖
Owner SHANDONG UNIV
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