If the pixel is a local maximum or minimum, it is selected as a candidate keypoint.
如果像素是局部的最大值或者最小值，则会被作为备选的特征值。
A stationary point which is neither a local maximum nor a local minimum point is called a saddle point.
一个既不是局部极大点又不是局部极小点的平稳点称为一个鞍点。
The result of maximum energy method depends on the initial values of residual statics. The solution is often trapped into the local minimum of the objective function.
最大能量法的结果受初始静校正量的影响，它的解容易陷入目标函数的局部极小值。
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