论文中文题名: | 非量测型数码相机的检校 |
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学号: | 06375 |
保密级别: | 公开 |
学科代码: | 081601 |
学科名称: | 大地测量学与测量工程 |
学生类型: | 硕士 |
学位年度: | 2009 |
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专业: | |
第一导师姓名: | |
论文外文题名: | The Calibration of Non-Metric Digital Camera |
论文中文关键词: | |
论文外文关键词: | digital camera calibration optical distortion error co-surface DLT successiv |
论文中文摘要: |
作为近景摄影测量获取影像的主要设备之一,非量测型数码相机凭借其自身特有的优点,已广泛应用于近景摄影测量中。影响摄影测量成果精度的一个重要因素是相机参数,由于非量测数码机内方位元素和畸变系数未知,且不够稳定,不能直接进行像位的解析计算,因此使用数码相机获取测量数据前,需要对相机进行检校。相机参数的检校成果质量的高低直接关系着能否满足测量精度要求。
针对众多的非量测相机的检校方法,本文以常用的、发展成熟的直接线性变换(DLT)模型检校方法和基于共线方程的像点坐标误差方程式的一般式为依据,通过分析数码相机的误差来源,同时考虑相机主距、像主点坐标和物镜光学畸变等因素引起的系统误差,提出了基于共面条件下连续像对相对定向的相机检校方法,借助拍摄目标的连续像对建立数学模型,利用泰勒级数对共面方程模型进行线性化,运用最小二乘原理将量测数据通过自编程序进行解算,在没有物方控制点的情况下实现相机各参数值的自检校。
本论文的提出的方法不需要做高精度的现场控制点,造价低,设备易携带,可以避免直接接触危险的量测环境,适合复杂的现场作业要求。通过像片间的几何关系,量算像点坐标,实现参数检校的全新方法!通过对数码相机检校成果、检校精度的比较、分析,对实验结果得出了一些结论。实验结果表明,基于共面条件的连续像对相对定向方法是可行和可靠的!
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论文外文摘要: |
As one of the main equipments about close-range photogrammetry to obtain images,non-metric digital camera with its own unique advantages, that has been widely used in close-range photogrammetry.An important factor of affect the accuracy of photogrammetric results is the camera parameters,because of unknowning of the machine inner orientation elements and distortion coefficient position about non-metric digital,and not stable enough, analytical calculation that can not be placed directly,so before useing the digital camera to obtain measurement data,need to camera calibration.So calibration of camera technical parameter is a key problem to guarantee result quality could meet precision request.
For a large number of non-metric camera calibration methods,in this paper, the basis is the method of the direct linear transformation (DLT) model and based on the total line equation of the general type of the error equation about pixel coordinates that have been commonly used and the development of sophisticated,by analyzing the source of error in digital cameras,meanwhile considering the factor of main away from the camera,the principal point coordinates and the lens optical distortion,that cause the system error, mading successibe stereopairs relative orientation based on coplane condition,with the goal of target shooting to set up mathematical models of successive stereopairs,the use of taylor series to linearization the coplanarity equation model.The use of own procedures to solver that based the least-squares principle measurement data basis.
With the absence of control points to achieve the self-calibration of parameters values, the proposed method of this paper does not do the high-precision control points at the scene, low cost,portable equipment,and avoid the risk of direct contact measurement environment,fit the request of site operations for complex requirements,through the geometric relationship between the photograph,volume calculation pixel coordinates,a new methods about implementation of calibration parameters,through the analysis and comparison to calibration results and precision for camera,and draw some conclusions.by analysis the experimental results the experimental result indicated that,calibration method based on the coplane condition is reliable and feasible.
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中图分类号: | P234.1 |
开放日期: | 2010-04-07 |