IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
A W-band auto-focus holographic imaging system for security screening
Hang ChengShiyong LiHaitao ZhengHandan JingHoujun Sun
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JOURNAL FREE ACCESS

2017 Volume 14 Issue 11 Pages 20170347

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Abstract

Millimeter-wave Holography is a promising technique for security screening to detect concealed weapons. However, a crucial disadvantage of this technique is that the close-range large-aperture operation result in a very short depth of focus. In this paper, a W-band auto-focus holographic imaging system is presented. By calculating and comparing the amplitude integral value of holographic imaging results reconstructed at different focusing distances, the algorithm can assess focusing quality of each imaging result, choose the optimal focusing distance, and extract the optimum viewing image from the imaging results. The scheme of imaging system is described in detail. Both simulation and experimental results are provided to demonstrate that the focusing performance of new auto-focus imaging system is much better than conventional holographic system.

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© 2017 by The Institute of Electronics, Information and Communication Engineers
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