有时在对图像进行分割时需要利用先验知识，如若分割出某个目标物时，可以利用颜色模型（HSV或HSI等），但还需利用“目标颜色”这个先验知识才能很好的将它分割出来，但对于目标物而言，可能夹杂其他颜色，此时对于H分量的区间范围的判定较为困难。-Sometimes when image segmentation requires prior knowledge, when Should a segmented target, you can use color model (HSV or HSI, etc.), but also need to use the　target color　the a priori knowledge to good will it is carved out, but for the target, the other colors may be mixed, this time interval is more difficult to determine the scope of the H component.