Fast Hardware Implementation of Sub-pixel Search Algorithm for Digital Speckle Correlation Method

DOI

10.2991/eame-18.2018.75How to use a DOI?

Keywords

digital speckle correlation measurement method; sub-pixel search algorithm; hardware acceleration

Abstract

Digital speckle correlation measurement method is an important way in the areas of three-dimensional deformation and morphology measurement. It carries the advantages of non-contact, high precision and strong stability. The sub-pixel search algorithm which is used to improve the accuracy of displacement measurement is one of the key technologies in digital speckle correlation method. In order to reduce the computational complexity, the sum of absolute differences (SAD) is used as the correlation function. Special fixed-point arithmetic is designed to solve the problem of processing floating-point calculation during the hardware implementation. Experimental results show that the speed of hardware implementation is more than 600 times higher than that of software implementation. The sub-pixel search accuracy is about 0.1 pixel, and the search error is about 0.03 pixel.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Zejie Kuang
AU  - Guohe Zhang
AU  - Feng Liang
PY  - 2018/06
DA  - 2018/06
TI  - Fast Hardware Implementation of Sub-pixel Search Algorithm for Digital Speckle Correlation Method
BT  - Proceedings of the 2018 3rd International Conference on Electrical, Automation and Mechanical Engineering (EAME 2018)
PB  - Atlantis Press
SP  - 356
EP  - 360
SN  - 2352-5401
UR  - https://doi.org/10.2991/eame-18.2018.75
DO  - 10.2991/eame-18.2018.75
ID  - Kuang2018/06
ER  -