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本文通过分析现有工程图纸扫描图象的识别与理解系统，提出了表面粗造度的自动识别算法，从而弥补了以往系统的不足．基于图形约束的表面粗糙度整体识别算法符合技术人员的读图规律，处理速度快，可靠性高．该算法已在微机上调试成功．
In this paper, an automatic recognition algorithm of surface roughness is proposed by analyzing the recognition and comprehension system of the existing engineering drawings, which makes up for the deficiencies of the previous systems. The whole surface roughness recognition algorithm based on the graph constraint is in line with the reading rule of the technician and has the advantages of fast processing speed and high reliability. The algorithm has been successfully debugged on the computer.