Abstract

Precise online ending supervision for target positioning plays an important role in inertial confinement fusion (ICF) experiments. This paper presents a 6 degree of freedom (6DOF) ICF target displacement and rotation detection method using a scale invariant feature transform (SIFT) algorithm. A SIFT algorithm can extract image key points, which are localized to subpixel accuracy and can perform reliable matching between different views of an object. For testing the accuracy offline, precise and known displacement was given by an electromotor on a calibrated optical grating-vision platform. When the platform moves along its $x$ axis, the image of each step is captured with corresponding grating sensor values recorded. Offline experimental results prove that the different values between the image points and grating sensor are less than 1 μm (1/10 pixel). In online conditions, a 6DOF parallel robot subsystem is used as an ending driver, and a target alignment sensor is used to capture four orthogonal images. The feedback information is obtained by SIFT features. Due to the excellent matching ability and 1/10 subpixel localization accuracy of the SITF features, the proposed method can accurately and reliably online detect the displacement and rotation of target. The experimental results demonstrate the effectiveness of the method.

© 2015 Optical Society of America

Detection and tracking of sea-surface targets in infrared and visual band videos using the bag-of-features technique with scale-invariant feature transform

Tolga Can, A. Onur Karalı, and Tayfun Aytaç
Appl. Opt. 50(33) 6302-6312 (2011)

Strain field measurements around notches using SIFT features and meshless methods

Giancarlo Gonzáles and Marco Meggiolaro
Appl. Opt. 54(14) 4520-4528 (2015)

High-precision displacement measurement method for three degrees of freedom-compliant mechanisms based on computer micro-vision

Heng Wu, Xianmin Zhang, Jinqiang Gan, Hai Li, and Zhenya He
Appl. Opt. 55(10) 2594-2600 (2016)

Development of a grating-based interferometer for six-degree-of-freedom displacement and angle measurements

Hung-Lin Hsieh and Ssu-Wen Pan
Opt. Express 23(3) 2451-2465 (2015)

Micro-motion detection of the 3-DOF precision positioning stage based on iterative optimized template matching

Hai Li, Xianmin Zhang, Benliang Zhu, Yihua Lu, and Heng Wu
Appl. Opt. 56(34) 9435-9443 (2017)