利用双平行激光器法获取深海底栖生物大小及其误差分析

Remote Measurement and Error Analysis of Deep-sea Benthic Megafauna Using Paired-Laser Photogrammetry

摄像拖体是深海底栖生物调查中一个有力的新技术,具有调查范围广、持续时间长、原位无破坏等特点。已有研究较少关注自动化识别和误差分析。选取中国大洋协会第50航次太平洋摄像拖体观测图像,构建了深海生物个体形态测量方法,并对摄像拖体进行误差分析。该系统成功获取了太平洋深处12幅海参形态大小信息,观察到长达70.8 cm的绿色巨型海参。通过分析系统误差、安装误差以及观测误差发现激光器彼此不平行对观测结果影响最大。摄像托体摆动是观测中常见的误差来源,其订正方法依据理论分析获得。自动化识别和系统地分析摄像托体误差来源有利于合理得制定深海生物调查技术标准,推动深海底栖生物大范围普查。

Image sampling of megafauna using a towed camera is immensely beneficial in deep-sea biological investigations because of the benefits of a wide investigation range,long duration,and no risk of specimen destruction.However,its automatic identification and error analysis are still understudied.A deep-sea megafauna body size measurement method was developed using towed camera observation photographs from the COMRA 50th cruise.We successfully obtained body size information of 12 sea cucumbers in the Pacific Ocean and observed a green giant sea cucumber 70.8 cm long.We examined the towed-camera system,installation,and observation errors,which imply that nonparallel lasers cause the most significant errors.A technique for correcting the inaccuracy caused by the swing of the towed camera was developed.Based on the above results,it is beneficial to logically develop the technical requirements for the examination of deep-sea megafauna with a towed camera and to encourage extensive investigation of deep-sea benthic megafauna.