| 基于轮廓形状分析的地形图数字注记提取 |
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| 引用本文： | 郭丙轩,李德仁,雷震.基于轮廓形状分析的地形图数字注记提取[J].武汉大学学报(信息科学版),2001,26(3):275-278. |
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| 作者姓名： | 郭丙轩 李德仁 雷震 |
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| 作者单位： | 郭丙轩（武汉大学测绘遥感信息工程国家重点实验室，武汉市珞喻路129号，430079）
李德仁（武汉大学测绘遥感信息工程国家重点实验室，武汉市珞喻路129号，430079）
雷震（武汉大学测绘遥感信息工程国家重点实验室，武汉市珞喻路129号，430079） |
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| 摘 要： | 针对地形图中图线与注记字符合离的问题，本文提出了基于轮廓的形状分析来提取组成形图注记基元的方法，克服了字线粘连造成的分离困难，提高了所提取注记信息的完整性。提取的结果为地形图中注记的进一步识别提供了依据。
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| 关 键 词： | 地图识别 复杂度 图文分离 轮廓形状 字符提取 地形图 数字注记 |
| 文章编号： | 1000-050X(2001)03-0275-04 |
| 修稿时间： | 2001年1月12日 |
Numeric Annotation
Abstraction from Map Based onContour Shape Analysis |
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| GUO Bingxuan,LI Deren,LEI Zhen.Numeric Annotation
Abstraction from Map Based onContour Shape Analysis[J].Geomatics and Information Science of Wuhan University,2001,26(3):275-278. |
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| Authors: | GUO Bingxuan LI Deren LEI Zhen |
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| Abstract: | ing the numeric annotations from topographic map according to contour shape analysis is presented.Because the contour shape concludes full shape information of a figure,it is possible to abstract annotations according to it avoiding aberration caused by skeleton abstracting methods. In this article,we described a five_step process for numeric annotation abstraction and practical arithmetic for each step:1) Get contour shape pixels from map.2) Trace the pixels and connect them in the form of link_code.3) By improved Dichotomy vector generating arithmetic,express the link_code contour shape into vector form.4) Decompose the contour shape vector into segments.5) Abstract annotation from char segments. As emphasis,we described the arithmetic of contour shape expression and decomposition.We presented a contour shape decomposing arithmetic according to the complex degree calculate from curvature and one time difference of contour shape,which can distinguish character segment from general segment.Because different figures have different complex degrees,by defining and calculating the complex degrees of each contour shape,we divided the contour shape lines segments into two classes: character segments and general line segments.We used such division to abstract the numeric annotations from topographic maps.We also presented an improved Dichotomy vector expression,which can balance the quality and cost requirement. At the end of this article,we presented the result of experiment.It proved that the process and arithmetic described above is practical and efficient. |
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| Keywords: | topographic map recognition complex degree separation of text and symbol contour shape character abstraction |
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