按15%和10%的抽样比例得到的核心库的方差差异百分率相等而高于25%抽样比例的方差差异百分率；
These percentage of variance difference through sampling at 15% and 10% were higher than that of through sampling at 25%.
由模型说明的方差比例范围为21%至28%。
The proportions of the variance explained by the models ranged from 21% to 28%.
对子图像进行局部直方图计算，由最大方差比例阈值确定方法计算出子图像的最佳阈值。
Every child image of the local regions is calculated, and the best threshold value of child image with the method of the biggist proportion of squase deviations is calculated.
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