国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

Affected by manufacturing technology, wear and pollution, the automatic calibration technology of line scale is limited to some extent. Based-on the characteristic of line scale, and for the line scales which the edge is high-contrast with noise badly, the algorithm limit the image processing region to the edge region firstly, and then search for the dots with maximum variation of gray level, discontinuous edge points are kicked, at last the edge lines are fitted and the center line is extracted. For the line scales which edge is blurred because of distortion, the algorithm fitting two straight lines of background and line regions, and get the crossover point, finally the center line is extracted. The third grade line meter scale is calibrated automatically more than once, and the maximum difference of the same line is 1.4μm, the standard deviation is 0.66μm, the algorithm is fit for the calibration of high-grade line scale and the robustness is good.