应用自适应理论和模糊理论，提出几种确定二值化阀值的具体方法。这些方法

然由简到繁，但是其灰度的局部适应性和方向的匹配性越来越强，因而得到的阀

越来越准确。-Adaptive theory and fuzzy theory, several binarization threshold to determine the specific method. However, these methods from the simple to the complex, but the intensity of local adaptation and direction of matching growing, and thus get more accurate valve.