梯形螺纹的测量方法主要包括综合测量法和三针测量法。
The measurement of screw thread mainly comprise of synthetical measurement and three-needle measurement;
这款由瑞士制造的三针手表提供最精确的计时功能，秒表计时功能可准确无误地测量出百分之一秒的表现。
The Swiss-made chronograph offers split-second timing - with a stopwatch that measures performance accurately to one-tenth of a second.
前言： 基于螺纹测量“三针法”的原理，使用机器视觉的方式，研制开发了三维自动锥螺纹检测系统本体，对图像处理技术中的预处理部分做了简单探讨。
Based on the "three-ball" measurement theory and the machine vision technology, a novel instrument for measuring taper thread is introduced. At the same time, image pre-process technology is analyzed.
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