阈值分割算子之OSTU算法

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1、原理参考：https://www.cnblogs.com/guopengfei/p/4759569.html

2、公式推导：

3、同halcon的binary_threshold (Image, Region, "max_separability", "light", UsedThreshold3)算子。

    具体推导如下：

 gray_histo (Region, Image, AbsoluteHisto, RelativeHisto) nAveragray:=0 for Index := 0 to 255 by 1     nAveragray:=nAveragray+RelativeHisto[Index]*Index  endfor wk:=0.0 uk:=0.0 MaxDiff:=0.0 Diff:=0.0 AutoThre:=0 for Index := 0 to 255 by 1     wk:=wk+RelativeHisto[Index]     uk:=uk+RelativeHisto[Index]*Index     if(wk<=0.0 or wk>=1.0)          Diff:=0     else          Diff:=(nAveragray*wk-uk)*(nAveragray*wk-uk )/(wk*(1-wk))     endif     if(Diff>MaxDiff)           MaxDiff:=Diff           AutoThre:=Index     endif endfor

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