论文采用边过程的思想，提出了一种基于目标区域边界像素表示的围线追踪算法。

This paper presents an improved contour-tracing algorithm, in which the contour is represented by the boundary pixels of the object.

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系统追踪像素移动痕迹，用户挪动鼻子让光标在显示屏上做出相应的操作。

The system keeps track of the pixels, and the user matches the movements of his or her nose with the progress of the cursor across the monitor.

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