Then by analyzing the characteristics of the road surface images, we carry out some necessary preprocesses such as gray scale calibration and geometry calibration to these images.
接下来分析了路面图像的特点，并对原始路面图像进行了必要的预处理，进行灰度校正和几何校正。
Adopted national standards micrometer scale calibration, it can get the actual numerical size after selecting the numerical scale that corresponding to objective lens in each test.
通过国家标准测微尺标定后，每次测试只须选择与物镜相对应的比例尺数值即可直接得到样品的实际大小数值。
The on the spot inspection of natural gas orifice meter is adopting the transitivity calibration method taking Venturi nozzle as calibration scale.
天然气孔板流量计的现场检定，采用以文丘里音速喷嘴作为标准表的传递型校准法。
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