双半字识别算法在水表字符识别系统中的应用

摘要

In water character recognition system ,it is hard to recognize the character when upper and lower half‐word is incomplete because of the usual situation of partial carry caused by meter mechanical structure .To solve the problem ,an improved double half‐word recognition algorithm is proposed in this paper .Firstly ten standard complete two‐character templates are made .Then double half‐word is cut from the two‐character templates based on the incomplete double half‐word which is waited recognition by segmentation and the improved Hausdorff‐distance template matching is applied to pattern match .Finally the character is determined by comparing the ratio of upper and lower half ‐word .It approves that this improved algorithm shows good recognition to this type of double half ‐word and improves effectively the character recognition power of automatic reading meter system in the experiment .%水表自动抄表系统中，由于水表机械结构的原因，读数转盘常常出现进位不完全的情况，导致读数出现上下双半残缺字符，不利于识别。对这类双半字符进行研究，提出了改进的双半字识别算法。首先制作十个标准的完整双字符模板，然后根据分割的待识别双半残缺字符，从完整双字符模板中截取双半字符模板，利用改进的 Hausdorff 距离模板匹配进行匹配识别，最后通过比较上下半字符的比例确定字符读数。实验结果表明，算法对这类双半字符有较好的识别结果，有效地提高了水表自动抄表系统中字符识别能力。