• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Underwater technology >A practical guide to the use of consumer-level digital still cameras for precise stereogrammetric in situ assessments in aquatic environments
【24h】

A practical guide to the use of consumer-level digital still cameras for precise stereogrammetric in situ assessments in aquatic environments

机译：在水生环境中使用消费者级别的数码相机进行精确的立体测量原位评估的实用指南

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Scientists planning to use underwater stereoscopic image technologies are often faced with numerous problems during the methodological implementations: commercial equipment is too expensive; the setup or calibration is too complex; or the imaging processing (i.e. measuring objects in the stereo-images) is too complicated to be performed without a time-consuming phase of training and evaluation. The present paper addresses some of these problems and describes a workflow for stereoscopic measurements for marine biologists. It also provides instructions on how to assemble an underwater stereo-photographic system with two digital consumer cameras and gives step-by-step guidelines for setting up the hardware. The second part details a software procedure to correct stereo-image pairs for lens distortions, which is especially important when using cameras with nop-calibrated optical units. The final part presents a guide to the process of measuring the lengths (or distances) of objects in stereoscopic image pairs. To reveal the applicability and the restrictions of the described systems and to test the effects of different types of camera (a compact camera and an SLR type), experiments were performed to determine the precision and accuracy of two generic stereo-imaging units: a diver-operated system based on two Olympus Mju 1030SW compact cameras and a cable-connected observatory system based on two Canon 1100D SLR cameras. In the simplest setup without any correction for lens distortion, the low-budget Olympus Mju 1030SW system achieved mean accuracy errors (percentage deviation of a measurement from the object's real size) between 10.2 and -7.6% (overall mean value: -0.6%), depending on the size, orientation and distance of the measured object from the camera. With the single lens reflex (SLR) system, very similar values between 10.1% and -3.4% (overall mean value: -1.2%) were observed. Correction of the lens distortion significantly improved the mean accuracy errors of either system. Even more, system precision (spread of the accuracy) improved significantly in both systems. Neither the use of a wide-angle converter nor multiple reassembly of the system had a significant negative effect on the results. The study shows that underwater stereophotography, independent of the system, has a high potential for robust and non-destructive in situ sampling and can be used without prior specialist training.
机译：计划使用水下立体影像技术的科学家在方法实施过程中经常面临许多问题：商业设备太昂贵；设置或校准太复杂；或成像处理（即测量立体图像中的对象）太复杂而无法执行，而无需花费大量时间进行训练和评估。本论文解决了其中一些问题，并介绍了海洋生物学家进行立体测量的工作流程。它还提供了有关如何将水下立体照相系统与两个数字消费相机组装在一起的说明，并提供了设置硬件的分步指南。第二部分详细介绍了针对镜头畸变校正立体图像对的软件过程，这在使用带有经过点校准的光学单元的相机时尤其重要。最后一部分介绍了测量立体图像对中对象的长度（或距离）的过程的指南。为了揭示上述系统的适用性和局限性，并测试不同类型的相机（紧凑型相机和SLR型）的效果，进行了实验以确定两个通用立体成像单元的精度和准确性：基于两个Olympus Mju 1030SW紧凑型相机的操作系统，以及基于两个佳能1100D SLR相机的有线天文台系统。在最简单的设置中，无需对镜头畸变进行任何校正，低预算的Olympus Mju 1030SW系统在10.2至-7.6％（总平均值：-0.6％）之间实现了平均精度误差（测量值与物体实际尺寸的百分比偏差）。 ，具体取决于被测物体距相机的大小，方向和距离。使用单镜反射（SLR）系统时，观察到的值非常相似，介于10.1％和-3.4％之间（总平均值：-1.2％）。镜头畸变的校正显着改善了两个系统的平均精度误差。甚至，两个系统的系统精度（精度分布）都得到了显着提高。使用广角转换器或多次重新组装系统都不会对结果产生重大负面影响。研究表明，独立于系统的水下立体摄影技术具有进行稳健且无损原位采样的巨大潜力，无需事先经过专业培训即可使用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号