| 基于交比的单幅图像平面几何信息提取算法 |
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| 引用本文： | 王美珍,刘学军,甄艳,卢玥.基于交比的单幅图像平面几何信息提取算法[J].武汉大学学报(信息科学版),2011(2):190-194. |
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| 作者姓名： | 王美珍 刘学军 甄艳 卢玥 |
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| 作者单位： | 南京师范大学虚拟地理环境教育部重点实验室; |
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| 基金项目： | 国家863计划资助项目(2007AA12Z238) |
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| 摘 要： | 提出并实现了基于交比这一射影变换不变量的单幅图像平面几何信息提取方法。该方法首先利用结构化场景中的平行、垂直等几何关系计算平面的灭点灭线;然后利用平面上已知长度的参考线段及灭点、灭线信息构建交比;最后依据待求线段与已知几何信息的位置关系计算待求线段的长度。对实验数据计算结果的精度分析验证了算法的正确性和可行性。
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| 关 键 词： | 单幅图像 距离量测 交比 灭点 灭线 |
Distance Measurement for a Single Image Based on Cross Ratio |
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| WANG Meizhen LIU Xuejun ZHEN Yan LU Yue.Distance Measurement for a Single Image Based on Cross Ratio[J].Geomatics and Information Science of Wuhan University,2011(2):190-194. |
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| Authors: | WANG Meizhen LIU Xuejun ZHEN Yan LU Yue |
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| Institution: | WANG Meizhen1 LIU Xuejun1 ZHEN Yan1 LU Yue1(1 Key Laboratory of Virtual Geographic Environment,Ministry of Education,Nanjing Normal University,1 Wenyuan Road,Nanjing 210046,China) |
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| Abstract: | An approach based on cross ratio to distance measurement for a single uncalibrated image is presented.Without any prior knowledge of the camera internal parameters(such as focal length and aspect ratio) or its pose(position and orientation),we put foreword and employ nested cross ratio to compute the length of a line segment on plane surface,while only the length(s) of the certain segment(s) is/are known.Based on previous steps one conclusion can be acquired: Once the lengths of rectangle two sides on one p... |
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| Keywords: | single image distance measurementl cross ratio vanishing point vanishing line |
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