A System of Head Mounted Eye Tracker with Head Movement Compensation
| Autor: | Tan, Wei-Chieh, 唐唯傑 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Eye tracker is a device for measuring eye movements and estimating POG (Point of gaze). It is currently used in psychology field and also can be the assistive devices for disabled people. After calibration, if user’s head moves when using eye tracker, the error of POG will enlarge. An easy way to solving this problem is using some device to hold user’s head, but for pursue the freedom and comfort, how to estimate correct POG when head moving is one of important topics in eye tracker field. The topic is called head movement compensation. There are three major methods of estimating POG in the related research. First, estimating POG by using 2D mapping function, second, estimating POG according to the relative position between light points reflect on eye ball and pupil center, third, building the 3D eye ball module to estimate visual axis and optical axis. There are many different ways of head movement compensation for each method of estimating POG, and they also have different advantages and disadvantages. In this work, this paper presents an approach of head movement compensation and implement it. Build an eye tracker system has the ability of head movement compensation. In this system, the hardware this system using is a head mounted eye tracker has two cameras. Beside mode of head movement compensation, this system also has the basic modes like mode of no head movement and mode of real scene. In the section of the approach of head movement compensation, this system uses scene camera to detect circular patterns pasted on monitor and estimate monitor’s depth and 3D position. When calibrating, get the information of mapping function and calibration plane, when using eye tracker, estimate visual axis by them and calculate POG, reduces the error caused by head movement. Compare with [35], The experiment result shows this approach can reduce 0.5~1゜degree error when user has large head movement. Keywords:eye tracker, head movement compensation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|