zero level set

The prior region constrains the zero level set evolving in certain region and the prior shape pulls the curve to the ideal contour.

先验区域限制水平集在特定区域迭代，先验形状使曲线向理想轮廓演化。

And so, in particular, if we set this equal to zero instead of approximately zero, it means we'll actually be moving on the tangent plane to the level set.

而且，特别地，如果我们令此函数为零，而不是近似为零，它意味着我们在水平集的切平面上移动。

Using this method to set the indent level to a number less than 0 (zero) or greater than 15 causes an exception to be thrown.

如果使用此方法将缩进级别设置为小于0(零)或大于15的数字，将导致引发异常。