瞳孔检测与跟踪可分为三个阶段：人脸检测、瞳孔检测、瞳孔跟踪。
There are mainly three steps in pupil detection and tracking: face detection, pupil detection and pupil tracking.
在屏幕上方有一个隐藏的装置，在小丹尼尔的眼睛跟随火车的运动时，跟踪他的眼睛，并且在一秒钟内，测量了他的瞳孔的直径50次。
A hidden device above the screen is tracking Daniel's eyes as they follow the train and measuring the diameter of his pupils 50 times a second.
与传统的基于瞳孔亮度的方法比较，此方法不仅克服了各种条件的限制，而且提高了跟踪的正确率。
By comparing the conventional appearance based bright pupil method, this method is able to improve tracking accuracy and overcome various limitations.
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