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。
2
They are average value filtering, medium value filtering, math morphologic operations including unlock operation and close operation and how to extracting image's contour line, skeleton, and so on.
例如均值、中值、滤波过程，数学形态学运算中的开启、闭合，以及图像的轮廓线、骨架线的提取技术等。
3
The results of the experiments show that the proposed method can accurately extract the contour of proximal femur from CT images of hip joint, which has practical value.