cvi图像分割技术的应用，通过基于均方错分误差最小的阀值选择方法，基于灰度差直方图的阀值选择方法，以及基于类间方差的阀值选择方法确定其分割的阀值。-cvi image segmentation techniques, through the mistake based on mean square error of the smallest sub-threshold selection method, based on the bad gray histogram threshold sele