摘要电表回厂处理之前,需要保存电表型号、名称、测量数据、生产厂家、电表局编号和条形码等信息,传统的人工识别、保存方式存在效率低下、易于出错等种种弊端,基于数字图象处理技术的电表要素自动定位和识别是大势所趋。对单相数字电表要素的定位和识别技术进行了研究,并实现数字电表要素的自动定位、自动识别和存储。
在图象预处理阶段,先对图象进行去四周和归一化,以缩小图片,减少数据处理量。比较了多种阈值分割方法后,选用固定阈值,然后采用局部二值化法的LEVBB法对图象进行二值化,取得了较好的效果。在要素识别时,经过对比试验,采用了一种相对简单的基于图象结构特点的方法即结合交叉点法和“数字边缘提取”数字识别算法的识别方法。最终对电表读数进行识别,取得了较为满意的效果。关键词 电表要素 投影定位 读数识别 8676
毕业设计说明书(论文)外文摘要
Title Study on Electric Meter Factor Identification Technology
Abstract
Before Electric meter send back to factory, we need to save electricity meter's types, names, measurement data, manufacturers, electric meter bureau Numbers and bar code and other information. But the traditional artificially identification and save mode is low efficiency, easy to go wrong. Elements of single-phase digital meter location and identification which is based on digital image processing is the wave of the future. We have discussed the technique of elements of single-phase digital meter location and identification and achieve the automatic positioning、automatic identification and storage of Elements of single-phase digital meter.
In the image preprocessing stage, first to cut off the around of image and the normalized to reduce image, reduce data capacity. Compare a variety of threshold segmentation method, choose the fixed threshold, and then used LEVBB to get binary image and achieves good effects.
In elements identification stage, through contrast test, using a relatively simple method based on image structure characteristics is combined with cross points and “digital edge extraction” digital recognition algorithm identification method. Final meter readings to identify, and achieved satisfactory results.
Keywords electric meter elements projection positioning Indication Recognition
目次
1 绪论 4
1.1 研究背景 4
1.2 研究现状 4
1.2.1 现代抄表现状 4
1.2.2 图象处理与数字识别的研究现状与发展 5
1.3 本课题研究的意义 6
1.4 本课题研究的主要内容 7
1.5 字符识别步骤 7
2 图象预处理 9
2.1 去四周并归一化图片 9
2.2 图象灰度化 11
2.2.1 灰度图象 11
2.2.2 灰度级 11
2.2.3 灰度化 11
2.3 图象二值化 12
2.3.1 动态阈值法 13
2.3.2 全局阈值法 13
2.3.3 局部阈值法 15
2.3.4 本文选择的方法 17
3 电表号码区域的定位研究 20
3.1 电表号码区域定位技术介绍 20
3.2 一般的定位方法 20
3.3 基于水平、垂直投影定位 21
3.3.1 投影法介绍 21 LEVBB电表要素识别技术研究+文献综述:http://www.youerw.com/tongxin/lunwen_7101.html