基于缺粒物镜的近景摄影测量新方法

Xiaohui Yang, Zongchun Li
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引用次数: 0

摘要

近景摄影测量以其方便、精度高的特点,是一种检测物体大小、形状和位置的重要方法。但在一些极端环境下,传统的测量方法难以满足测量要求,仍有许多测量工作是传统方法无法完成的。本文提出了一种利用单相机测量模型测量物体截面的新方法。为了达到这一目的,本文主要分为三个部分。首先,提出了两种激光条纹提取方法,通过从不同高斯噪声的图像中提取激光条纹,比较了两种方法的提取精度和时间。Steger法的精度高于曲线拟合法。但曲线拟合法比Steger法耗时短。其次,对传统的Autobar进行了改进,以适应暗测环境。考虑到反光目标和普通黑白目标在没有频闪灯或光照不足的情况下不易识别,将传统Autobar的反光材料替换为LED灯,使其在拍摄时无强烈闪烁,图像中容易识别。最后,通过仿真实验验证了整个测量过程,验证了单相机测量模型的可行性。最后的仿真实验结果表明,所提出的测量模型是可行的。该测量模型大大提高了测量效率,使测量工作更加灵活。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New close-range photogrammetry method based on grain-lacking object
Close-range photogrammetry is a significant method that can detect size, shape and position of objects for its conveniences and high accuracy. But in some extreme environment, the conventional method is difficult to match the request of measurement for there are still many measurement work can not complete using traditional method. This paper has development a new method to measure the section of objects using the single camera measurement model. In order to achieve the purpose, there are three main parts in this paper. Firstly, two extraction method of laser fringe is presented, their extraction precision and time is compared via extracting laser fringe from images with different Gauss noise. Steger method's precision is higher than curve fitting method. But curve fitting method cost less time than Steger method. Secondly, we have improved the traditional Autobar to adapt the dark measure environment. Considering retro-reflective targets and common black-white targets can not be recognized easily while without strobe light or lack of illumination, the retro-reflective material of traditional Autobar is replaced with LED light to be recognized easily in image without strong flicker when photographing. At last, a simulation experiment is taken to demonstrate the whole measurement process and validate the new single camera measurement model' feasibility. The final results of simulation experiments showed that the newly presented measurement model has its feasibility. This measurement model greatly improves the measurement efficiency and makes the measurement work more flexible.
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