【摘要】 提出将先进的数字图像处理技术应用于大尺寸机械量的测量中， 以实现地铁车厢限界高效、准确地自动化检测， 并针对地铁车厢限界检测的具体情况， 论述了这种相对测量方法在机械量测量中的应用原理更多还原

【Abstract】 The measure of subway carriage limit is an important part of the subway vehicle quality inspection,but the internal device made by hand is simple and crude.Meanwhile,there are some short comings in it:inaccurate,inconvenient and inefficient.So it is put forward that the advanced technology of digital image processing should be used in the machinery measure of the large size in order to measure the subway carriage limit efficiently,accurately and automatically.According to the measurement for the subway carriage limit,how to use this relative measurement in the machinery measure is discussed here.更多还原