High Precision Monocular Plane Measurement for Large Field of View

In order to obtain high precision in wide-area monocular plane measurement system, a target should be large enough to cover the whole field of view (FOV). For cameras with large FOV, using a small target will seriously reduce the precision of calibration. However, using a large target causes many difficulties in making, carrying and employing the large target. In order to solve this problem, a calibration method for cameras with a large field of view(FOV) by using a fictional large plane target(FLPT) is proposed in this paper, in which the FLPT consists of multiple small targets (MST) which are placed in the measurement plane. First, get a series of images when small target are in different positions of the measuring plane. Secondly, based on refer small target, the fictional small target of each image is obtained by rotation and translation, the FLPT is built by fictional small target. Finally, intrinsic and extrinsic parameters of the camera are calculated by using the FLPT, calculate the homography matrix, to achieve a large field of view plane measurement. The experimental results show that the error of measurement and positioning is lower than 0.3% in the trapezoidal measurement field with a upper line of 1400mm, lower line of 2200mm and height of 1600mm.

[1]  Xiao-feng Feng,et al.  A camera calibration method based on plane mirror and vanishing point constraint , 2018 .

[2]  Hiraku Sakamoto,et al.  Feasibility study on a strain based deflection monitoring system for wind turbine blades , 2017 .

[3]  Yun Wang,et al.  Multi-camera global calibration for large-scale measurement based on plane mirror , 2015 .

[4]  Dan Zhao,et al.  Optimization design of non-coplanar target for pose measurement with monocular vision system , 2017 .

[5]  Helder Araújo,et al.  Investigating new calibration methods without feature detection for TOF cameras , 2015, Image Vis. Comput..

[6]  Juntong Xi,et al.  A two-step calibration method of a large FOV binocular stereovision sensor for onsite measurement , 2015 .

[7]  Guangjun Zhang,et al.  A novel and accurate calibration method for cameras with large field of view using combined small targets , 2015 .

[8]  Stefan Hinz,et al.  Improved wide-angle, fisheye and omnidirectional camera calibration , 2015 .

[9]  Oleksandr Semeniuta,et al.  Analysis of Camera Calibration with Respect to Measurement Accuracy , 2016 .

[10]  Peng Wang,et al.  Computational optical distortion correction based on local polynomial by inverse model , 2017 .

[11]  Bing Pan,et al.  Full-frame, high-speed 3D shape and deformation measurements using stereo-digital image correlation and a single color high-speed camera , 2017 .

[12]  Yang Nin.  A calibration method of camera with large field-of-view based on spliced small targets , 2013 .

[13]  Xiaofeng Li,et al.  Calibration method with separation patterns of a single-camera , 2006, SPIE Astronomical Telescopes + Instrumentation.

[14]  Yin Guo,et al.  Flexible digital projector calibration method based on per-pixel distortion measurement and correction , 2017 .

[15]  Min Young Kim,et al.  Adaptive 3D sensing system based on variable magnification using stereo vision and structured light , 2014 .