SML映射规则的期望误差一定不会小于GML映射规则的期望误差。而且从算法实现上也可以看出，SML映射规则是一种有偏的映射规则，某些范围的灰度级会被有偏地映射到接近开始计算的灰度级；而GML映射规则是统计无偏的，从根本上避免了上述问题的出现。通过分析可以看出GML映射规则总会比SML映射规则更能体现规定直方图的意图，而且通常产生的误差只有SML映射规则的十几分之一

用VC++写的三次B样条曲线算法，能够实现与控制多边形的外形更接近，局部修改能力 任意形状，包括尖点、直线的曲线，易于拼接，阶次低，与型值点数目无关，计算简便-Using VC++ to write the three B-spline curve algorithm, can be achieved with the control polygon is closer to the shape, the capacity of local modification of arbitrary

功能很全面，完成了很多绘图样式，操作很方便，界面也很不错，接近专业水平的VC++绘图作品-Function is very comprehensive, and completed a lot of drawing style, very easy to operate, the interface is also very good, close to the professional level VC++ drawing works