| 一种正射影像拉花现象的处理方法 |
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| 引用本文： | 郭永春,柴智,彭桂辉.一种正射影像拉花现象的处理方法[J].地理空间信息,2021,19(1):112-115. |
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| 作者姓名： | 郭永春 柴智 彭桂辉 |
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| 作者单位： | 中煤航测遥感集团有限公司,陕西西安 710054;北京市地质调查研究院,北京 102206;中煤航测遥感集团有限公司,陕西西安 710054 |
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| 摘 要： | 在地形变化剧烈的正射影像中,受摄影时中心投影对影像获取的影响,数字微分纠正过程中部分成像信息不足的图像区域会出现被过度拉伸的现象,称之为拉花现象。基于此,深入分析了拉花现象的形成机理,提出了一种基于Z-Buffer的拉花区域检测方法。首先对拉花区域进行标记,再采用对向互补策略,基于相邻未拉花影像对该区域重新进行数字微分纠正,修复拉花区域的纹理。实验结果表明,该方法能自动处理正射影像生产过程中的拉花区域,节省了大量的人工工作量,极大地提高了正射影像生产的精度和效率。
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| 关 键 词： | 数字正射影像 拉花现象 拉花检测 纹理修复 |
Processing Method for Orthoimage Stretch Phenomenon |
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| Abstract: | In digital orthoimage of drastic terrain changes,some areas in the image appear to be overstretched in the process of digital differential rectification due to the insufficient imaging information of a single image.This phenomenon is called stretch.In this study,we performed an in-depth analysis on the formation mechanism of the stretch phenomenon,and proposed a method to detect the stretch region based on Z-buffer.The stretch region was marked at first.And then,the digital differential rectification of the texture of the stretch region was performed using adjacent images.Finally,the texture of the stretch region was repaired.The result shows that this method can deal with the stretch region during orthoimage production automatically,which can greatly improve the accuracy and efficiency of orthoimage production. |
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| Keywords: | digital orthoimage stretch phenomenon stretch testing repair of texture |
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