测绘学报 ›› 2014, Vol. 43 ›› Issue (7): 724-730.

• 学术论文 • 上一篇    下一篇

曲折道路遥感影像圆投影匹配改进追踪法

傅罡1,赵红蕊1,李聪2,石丽梅1   

  1. 1. 清华大学土木工程系
    2. 清华大学
  • 收稿日期:2012-08-10 修回日期:2013-03-21 出版日期:2014-07-20 发布日期:2014-07-29
  • 通讯作者: 赵红蕊 E-mail:zhr@tsinghua.edu.cn

Twisty Road Tracking from Remote Sensing Imagery Using Improved Circular Projection Matching

  • Received:2012-08-10 Revised:2013-03-21 Online:2014-07-20 Published:2014-07-29

摘要:

道路提取是遥感信息提取的重点和难点。曲折道路(如盘山公路等)方向突变现象严重,当道路的宽度有变化或受到阴影、杂物遮挡等干扰时,其提取难度进一步增大。针对该问题,本文提出一种基于改进圆投影匹配的曲折道路自动追踪方法。首先,对标准圆投影匹配进行改进,包括:(1)提出圆投影向量近似度参数,实现对圆投影模板离散近似程度和计算量的控制;提出圆投影模板最优半径确定方法,以保证获得最大道路特征条件下,减少模板匹配计算量;(2)引入干扰校正算法,在一定程度上克服了由于光照、噪声等因素造成匹配困难的问题;其次,提出基于改进圆投影匹配的道路追踪方法,并在模板匹配过程中加入自适应机制,即将已匹配道路按照一定的权重参与后续模板匹配,一定程度上克服道路形态的变化和干扰。最后,以曲折道路特征突出的山区遥感影像SPOT-5和GeoEye-1进行道路提取实验。实验结果表明,采用提出的基于改进圆投影匹配的道路追踪算法具有方向无关的特点,适用于曲折道路遥感提取。对道路中心线的提取误差约2~5m,提取准确率高于80%。

关键词: 圆投影匹配, 曲折道路, 遥感影像, 道路追踪, 道路提取

Abstract:

Road extraction from Remote Sensing imagery attracted great attention and with great difficulty. Direction of twisty road (winding road in mountainous areas, etc.) changes seriously, and has poor geometry consistency. Variable road width or interferences, such as shadow and shelter, etc, increase the extraction difficulty. To solve this problem, this paper proposes a tracking method for twisty roads based on improved Circular Projection Matching algorithm. First, this paper proposes two improvements based on standard Circular Projection Matching, including: (1) Proposes the approximation parameter for circular projection vector as the circular projection similarity control; An optimal radius is proposed in order to reduce the calculation of the Circular Projection Matching with enough road characteristics matained. (2) Presents an interference correction algorithm, to a certain extent, overcome the matching problem between selected template and target object due to difference of lighting condition, image noise and other factors. Secondly, proposes a road tracking method based on above improved algorithm, and also proposes an adaptive template matching mechanism. The matched road targets are proper weighted, and are considered as part of the followed template. This mechanism makes the template flexible and less affected by the variations and interferences of roads. Finally, SPOT-5 and GeoEye-1 Remote Sensing image is used for experiment. The experiment result shows that the proposed road tracking method is direction-independent, which is applicable to the twisty road extraction. Road centerline extraction error is about 2~5m, and road extraction accuracy is higher than 80%.

Key words: Circular Projection Matching, Twisty road, Remote Sensing imagery, road tracking, road extraction

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