第二项是形状能量项，它保证主动轮廓在统计形状模型所允许的范围下形变；
The second term is based on the shape information, which constrains the active contour to approach a shape compatible with a statistical shape model of the shape of interest.
然后详细探讨了两类重要的形变模型——主动轮廓模型和主动形状模型的基本原理和实现方法。
Fundamentals and implementations of two kinds of basic deformable models, active contour model and active shape model, were discussed in detail.
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