Design of a real-time eye tracking system based on contactless configuration
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摘要: 為方便殘疾人和老年人使用計算機進行信息交互,設計了一種非接觸式低成本視線追蹤系統.系統設計了一種雙環形紅外光源,通過交替照射用戶臉部,用單CCD攝像機得到"亮瞳"和"暗瞳"的相鄰兩幀圖像.將這兩幀圖像做差得到瞳孔的位置,使用橢圓擬合方式求得瞳孔中心,加之在"暗瞳"圖像上得到的普洱欽斑中心,從而確定了局部視線的盯視方向.基于人類視線移動的特點,提出了使用神經網絡和卡爾曼濾波相結合的方法進行瞳孔跟蹤,最后給出了視線映射模型和校準方式.Abstract: In order to help the handicapped and the elderly use computer for information interacting, a low-cost and non-contact eye gaze tracking system is designed. This system is composed of two-loop illuminators and a CCD camera. The way of getting pupil position is to do subtraction of the two images, "bright pupil" and "dark pupil", which are gained by illuminating user's eyes alternate. The pupil center is localized by ellipse fitting, and the Purkinje image can be obtained in the "dark pupil" image, then the local gazing direction can be determined. Based on the characteristic of human gazing movement, the tracking strategy of pupil that is designed by neural network and Kalman filtering is discussed. At last, an eye gaze mapping model and its calibration are given.
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Key words:
- eye gaze tracking /
- human-computer interaction /
- pupil /
- Purkinje image
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