然后，每个水平集的边界被提取出来，图像边界上的数据被记录。
Then the boundaries for each level set are extracted, the image data on the boundaries are recorded.
如果再仔细观察，就可以发现集的边界并没有呈波纹线，而是像火焰一样闪光。
A closer look reveals that the borders of the set do not form crisp lines but seem to shimmer like flames.
定义了使模型具有经济意义的可行集，通过理论分析和数值仿真相结合的方法得到可行集的边界。
The feasible set is defined in which the variables economic senses exist and boundaries of the feasible set can be obtained by using combined methods of theoretical analysis and numerical.
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