阈值法是一种传统的图像分割方法，因其实现简单、计算量小、性能较稳定而成为图像分割中最基本和应用最广泛的分割技术．已被应用于很多的领域。本文是在阅读大量国内外相关文献的基础上，对阈值分割技术稍做总结，分三个大类综述阈值选取方法，然后对阈值化算法的评估做简要介绍。-Threshold method is a traditional image segmentation method, because of its simple, computation, more stable performance and become the most basic image segmentation and the most widely used segmentation. Has been used in many fields. This is a lot of reading on the basis of relevant literature on the segmentation threshold slightly summarized in three major categories of review threshold selection method, and then thresholding algorithm for the assessment of a brief introduction.