Calibration stability of an underwater stereo-video system : Implications for measurement accuracy and precision
Calibration stability of an underwater stereo-video system : Implications for measurement accuracy and precision
复制标题
水下立体视频系统的校准稳定性：对测量精度和精度的影响
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Shortis
中科院分区：
文献类型：
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作者：
E. Harvey;M. Shortis
种群结构评估常常被用来检测和分析环境因素或商业捕捞对海洋动物的影响。描述种群结构的一个主要工具是一个特定物种的个体样本的大样本的长度分布。没有使用潜水员的目测估计，而是开发了一个水下立体视频系统，以提高对珊瑚鱼等高度指示性物种长度的测量精度。与任何用于精确测量的系统一样，相机系统的校准对于实现系统的最大可能精度至关重要。此外，确定两个相机的相对方位对于正确估计鱼的长度至关重要。还有一个问题是，在部署拍摄海洋生物视频序列期间，摄像机的校准和相对定向的稳定性，因为任何变化都不可避免地会导致系统误差，从而导致测量长度的不准确。本文介绍了对水下立体视频系统的摄像机定标、相对定向和稳定性进行测试的一系列实验。描述了定标和定向综合确定的策略。校准和定向参数的变化是根据大小和重要性来量化的。最后，对检测到的变化进行了分析，以了解传播对目标空间精度的影响。
Assessment of population structure is often used to detect and analyze the impact on marine fauna of environmental factors or commercial fishing. A primary tool in the characterization of population structure is the distribution of the lengths of a large sample of individual specimens of a particular species. Rather than use visual estimates by SCUBA divers, an underwater stereo-video system has been developed to improve the accuracy of the measurement of lengths of highly indicative species such as reef fish. In common with any system used for accurate measurements, calibration of the camera system is of paramount importance to realize the maximum possible accuracy from the system. Further, the determination of the relative orientation of the two cameras is vital to the correct estimation of fish lengths. Also at issue is the stability of the calibrations and relative orientation of the cameras during deployments to capture video sequences of marine life, as any variations will inevitably lead to systematic errors and therefore inaccuracies in the measured lengths. This paper describes a series of experiments concerning the determination and testing of camera calibration, relative orientation and stability of the underwater stereo-video system. The strategy for the integrated determination of calibration and orientation is described. Variations in calibration and orientation parameters are quantified in terms of magnitude and significance. Finally, the detected variations are analyzed for the propagated effects on object space accuracy.