When the Angle is small, the saturation control is replaced by the reverse square root control.
小角度调转时用反向开方代替饱和控制的三模态控制。
The results show that the root mean square error(RMSE) of the control points obtained by the workflow is lower than 0.5 pixels.
结果表明，使用该方法选取的控制点均方根误差（RMSE）可以控制在0.5个像素以内。
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