基于轮廓形状分析的地形图数字注记提取

郭丙轩; 李德仁; 雷震

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基于轮廓形状分析的地形图数字注记提取

郭丙轩, 李德仁, 雷震

文章导航 > 武汉大学学报 ● 信息科学版 > 2001 > 26(3): 275-278

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.

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.

GUO Bingxuan, LI Deren, LEI Zhen. Numeric Annotation Abstraction from Map Based on Contour Shape Analysis[J]. Geomatics and Information Science of Wuhan University, 2001, 26(3): 275-278.

Citation:

GUO Bingxuan, LI Deren, LEI Zhen. Numeric Annotation Abstraction from Map Based on Contour Shape Analysis[J]. Geomatics and Information Science of Wuhan University, 2001, 26(3): 275-278.

基于轮廓形状分析的地形图数字注记提取

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

详细信息

作者简介:
郭丙轩,博士生。现从事地图识别、3S集成技术(车载导航、车载测量)研究。E-mail:gbx@rcgis.wtusm.edu.cn

中图分类号: P283.7;TP753

Numeric Annotation Abstraction from Map Based on Contour Shape Analysis

National Laboratory for Information Engineering in Surverying, Mapping and Remote Sensing, Wuhan University, 129 Luoyu Road, Wuhan, China, 430079

摘要: 针对地形图中图线与注记字符分离的问题,本文提出了基于轮廓的形状分析来提取组成地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。
- 地图识别 /
- 复杂度 /
- 图文分离 /
- 轮廓形状 /
- 字符提取
Abstract: A method for abstracting 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.
- topographic map recognition /
- complex degree /
- separation of text and symbol /
- contour shape /
- character abstraction

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基于轮廓形状分析的地形图数字注记提取

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

作者简介:
郭丙轩,博士生。现从事地图识别、3S集成技术(车载导航、车载测量)研究。E-mail:gbx@rcgis.wtusm.edu.cn

收稿日期: 2001-01-12
刊出日期: 2001-03-05

中图分类号: P283.7;TP753

关键词:

复杂度 /

摘要: 针对地形图中图线与注记字符分离的问题,本文提出了基于轮廓的形状分析来提取组成地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。

English Abstract

Numeric Annotation Abstraction from Map Based on Contour Shape Analysis

National Laboratory for Information Engineering in Surverying, Mapping and Remote Sensing, Wuhan University, 129 Luoyu Road, Wuhan, China, 430079

Received Date: 2001-01-12
Publish Date: 2001-03-05

Keywords:

Abstract: A method for abstracting 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.

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.

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.

GUO Bingxuan, LI Deren, LEI Zhen. Numeric Annotation Abstraction from Map Based on Contour Shape Analysis[J]. Geomatics and Information Science of Wuhan University, 2001, 26(3): 275-278.

Citation:

GUO Bingxuan, LI Deren, LEI Zhen. Numeric Annotation Abstraction from Map Based on Contour Shape Analysis[J]. Geomatics and Information Science of Wuhan University, 2001, 26(3): 275-278.