提出确定灰度图像二值化最佳灰度阈值的两种方法,即“双峰法”和“信噪比统计法”,并论证了这两种方法在微小零件尺寸及形位误差的检测中的实用性和局限性。-gray images made to determine the value of the two best-threshold value of the two methods "bimodal" and "signal-to-noise ratio statistics" and demonstration of the two approaches in micro-size components and configuration error detection of practicality and limitations.