TY - JOUR

T1 - Automatic and accurate passive target centroid detection for applications in engineering geodesy

AU - Omidalizarandi, Mohammad

AU - Paffenholz, Jens-André

AU - Neumann, Ingo

N1 - Funding information: The research presented was partly performed in the scope of the collaborative project ‘Spatio-temporal monitoring of bridge structures using low cost sensors’ with ALLSAT GmbH, which was supported by the German Federal Ministry for Economic Affairs and Energy (BMWi) and the Central Innovation Programme for SMEs (Grant ZIM Kooper-ationsprojekt, ZF4081803DB6).

PY - 2019/7/4

Y1 - 2019/7/4

N2 - A novel automatic and accurate passive target centroid detection approach is proposed and developed which has numerous fields of applications, such as in engineering geodesy, photogrammetry, robotics and navigation. It is robust and reliable with respect to poor environmental conditions, such as low lighting, dusty situations and skew angle targets. This research is conducted in two parts. First, an optimal target selection and its accurate, automatic and fast centroid detection are performed. Afterwards, two case studies of the proposed approach are presented for automatic target pointing by means of the telescope camera of an image assisted total station (IATS) (here Leica Nova MS50 MultiStation) and automatic target measurements for a digital camera (here Nikon D750). The results show that a circular target with a line pattern consisting of four intersected lines is an optimal pattern. The accuracy of the proposed method varies depending on the image resolution and distances to the objects. We performed experiments for distances between 1.6 and 28 m for the IATS and achieved sub-millimetre accuracy.

AB - A novel automatic and accurate passive target centroid detection approach is proposed and developed which has numerous fields of applications, such as in engineering geodesy, photogrammetry, robotics and navigation. It is robust and reliable with respect to poor environmental conditions, such as low lighting, dusty situations and skew angle targets. This research is conducted in two parts. First, an optimal target selection and its accurate, automatic and fast centroid detection are performed. Afterwards, two case studies of the proposed approach are presented for automatic target pointing by means of the telescope camera of an image assisted total station (IATS) (here Leica Nova MS50 MultiStation) and automatic target measurements for a digital camera (here Nikon D750). The results show that a circular target with a line pattern consisting of four intersected lines is an optimal pattern. The accuracy of the proposed method varies depending on the image resolution and distances to the objects. We performed experiments for distances between 1.6 and 28 m for the IATS and achieved sub-millimetre accuracy.

KW - Passive target centroid detection

KW - Optimal target pattern

KW - Image assisted total stations

KW - Digital camera

KW - Image processing

KW - Image analysis

UR - http://www.scopus.com/inward/record.url?scp=85044745773&partnerID=8YFLogxK

U2 - 10.1080/00396265.2018.1456001

DO - 10.1080/00396265.2018.1456001

M3 - Article

VL - 51

SP - 318

EP - 333

JO - Survey review

JF - Survey review

SN - 0039-6265

IS - 367

ER -