无约束

Absolute liberty is absence of restraint.

绝对的自由就是无约束。

Image reconstruction is often converted to the nonrestraint extremum of the nonlinear equations.We have deduced a conjugate gradient algorithm from the extremum of norm.

图像重建常常被转化为解非线性无约束极值问题,通过范数极小化推导共轭梯度法的一般算法。