@inproceedings{e36b734e021f40e2a3a7e77bd571a0e6,
title = "Extended depth of field for visual measurement systems with depth-invariant magnification",
abstract = "Conventional optical imaging systems are limited by a fundamental trade-off between the depth of field (DOF) and signal-to-noise ratio. Apart from a large DOF, a constant magnification within a certain depth range is particularly essential for visual measurement systems. In this paper, we present a novel visual measurement system with extended DOF and depth-invariant magnification. A varifocal liquid lens is employed to sweep its focus within a single exposure of the detector, after which a blurred image is captured. The blurred image is subsequently reconstructed to form a sharp extended DOF image by filtering with a single blur kernel. The experimental results demonstrate that our method can extend the DOF of a conventional visual measurement system by over 10 times, while the change in the magnification within the extended DOF remains less than 1\%.",
keywords = "Visual measurement, depth-invariant magnification, extended depth of field, telecentric lens, varifocal liquid lens",
author = "Yanyu Zhao and Yufu Qu",
year = "2012",
doi = "10.1117/12.999609",
language = "英语",
isbn = "9780819493187",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Optical Metrology and Inspection for Industrial Applications II",
note = "Optical Metrology and Inspection for Industrial Applications II ; Conference date: 05-11-2012 Through 07-11-2012",
}