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本文采用基面转换法建立数学模型，并对平面度最小区域的三个判别准则采取若干措施，提高了在线测量中平面度采样数据处理速度。
In this paper, the mathematic model is established by using the basic plane conversion method, and several measures are taken to the three discriminant criteria of the minimum flatness, which improves the processing speed of flatness sampling data in on-line measurement.