对于一般的无约束最优化问题及其特殊情况非线性最小二乘问题而言，信赖域方法是一种有效的方法。
Trust region method is a kind of efficient methods to solve the general unconstrained optimization and its special situation, the nonlinear least squares problems.
提取鱼眼图像轮廓一般是采用最小二乘拟和的方法，但该方法计算量大，精度难以保证。
The general method of contour retrieval is the least square method, but the computational effort of which is too much and the precision of which is difficult to ensure.
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