The lines in a Contour chart connect interpolated points of equal value.
曲面图（俯视）中的线是连接具有相同值的以内插值替换的点得到的。
The circular interpolated points with given gray-value are extracted as the verge of the spot.
并提取一定灰度值的光斑圆周插值点，作为圆形光斑边缘。
The circular interpolated points with given gray-value are extracted as the verge of the spot.
并提取一定灰度值的光斑圆周插值点，作为圆形光斑边缘。
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