3D free head moving type gaze tracking system

A gaze tracking, 3D technology, applied in image analysis, instrumentation, computing, etc., can solve problems such as inconvenience and increased cost

Inactive Publication Date: 2010-12-01
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this type of system allows the head to move freely, it increases the cost and...

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  • 3D free head moving type gaze tracking system
  • 3D free head moving type gaze tracking system
  • 3D free head moving type gaze tracking system

Examples

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Embodiment Construction

[0074] An experimental example of the present invention adopts C language computer programming to realize, and the hardware platform mainly comprises the following features:

[0075] (1) The image acquisition module includes a camera and an infrared light source. Under the irradiation of a near-infrared light source with a wavelength of 850nm, the iris reflects it more, and the pupil basically absorbs it completely, so the pupil and iris part of the near-infrared eye image formed has a strong contrast. At the same time, a filter is added in front of the camera to filter out most of the visible light, so as to eliminate the influence of visible light on the imaging effect.

[0076] (2) The camera is located below the screen, and the placement of the two near-infrared light sources is as follows: figure 2 .

[0077] After the digital image is collected by the camera, it is used as the input of the gaze tracking module. For each input, the gaze tracking system will output an o...

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Abstract

The invention discloses a 3D free head moving type gaze tracking system belonging to the technical field of image processing and pattern recognition. The 3D free head moving type gaze tracking system is realized by using the method comprising the steps of: calibration of camera internal parameters, the establishment of a hardware system, the extraction of the center calibrates of pupils in images and a flare point, the determination of the three-dimensional calibrate of a cornea center, the determination of the three-dimensional of the pupil center, the reconstruction of a visual axis and the final error correction treatment. A camera and two LED light sources are adopted in the gaze tracking system which overcomes the restriction that a head part of a traditional 2 D gaze tracking system need be strictly fixed and the disadvantage that a plurality of cameras or auxiliary devices are required to position the three-dimensional calibrate information of human eyes for 3D gaze tracking, and the invention further provides a gaze tracking method with convenient use, low cost and high accuracy.

Description

technical field [0001] The line of sight tracking algorithm in the present invention belongs to the technical field of image processing and pattern recognition, and relates to a 3D free head-moving line of sight tracking system based on a single camera, which can be applied to the research of visual attention mechanism, advertisement analysis, web page design, and medical treatment of disabled patients. Assistive devices and psychoanalysis, while also serving as a new computer-interactive device. Background technique [0002] Real-time tracking of human eye sight has very important applications in many fields. Eye-tracking systems can be divided into two types: head-mounted and non-contact according to the hardware configuration. Head-mounted eye-tracking technology requires users to wear some special equipment, which is inconvenient to use; non-contact generally adopts a method based on video image processing, and judges the direction of sight by analyzing the human eye im...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/20
Inventor 蔡超周成平王海亮
Owner HUAZHONG UNIV OF SCI & TECH
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