校正地基摄影获取树枝倾角Correction of photogrammetry for angle of branch
李雷,孟治国,郑兴明,赵凯,李晓洁,李晓峰
摘要(Abstract)：
针对传统树枝倾角测量方法的复杂性和精度低的问题,该文提出了通过校正地基摄影获取树枝倾角的方法。基于投影变换和小孔成像原理,通过自制树枝模型的方法,分析了直接图上量取树枝倾角与真实值之间误差的成因,提出了基于投影变化的树枝倾角计算公式。结果表明:该研究获取树枝倾角的相对误差2.72%明显优于传统测量的31.33%,同时随拍摄距离变化,树枝倾角估算结果具有稳定性。该研究方法简单、有效,非常适合复杂环境下树枝倾角的大量提取,并提出了一种基于摄影成像原理获取树枝倾角的方法,发展了树枝倾角测量系统软件,提高测量精度并降低了测量难度。
关键词(KeyWords)： 树枝倾角;摄影;投影变形;误差分析;数字图像
基金项目(Foundation): 国家自然科学基金项目(41371332,41301369,41501408);; 科技基础性工作专项(2014FY210800-4);; 吉林大学研究生创新基金资助项目(2016202)
作者(Author): 李雷,孟治国,郑兴明,赵凯,李晓洁,李晓峰
DOI: 10.16251/j.cnki.1009-2307.2018.05.019
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