Another approach of this thesis is to demonstrate that the lowest degree is 5 in order to make the b - spline patches hold the property of local adjustment if no specific 111 abstract restriction to the partition . most existed surfaces reconstruction methods adopt bezier tool and demand particular partition . the local scheme addressed in this thesis does n ' t restrict the partitions of fitted surfaces , and the fitting tools is biquartic b - spline surfaces with double interior knots and biquintic b - spline surface with single interior knots 本文论述的“局部格式”调整方法不对剖分区域施加任何限制，主要采用内部具有二重节点的双四次b样条曲面和单节点的双五次b样条曲面做为拟合工具，给出了“局部”调整的方法，该方法能很好的保持拼接曲面的几何特征，克服了许多已有的重构方法仅采用简单共线法处理几何光滑性的弊端。
