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Proceedings Paper

Super-resolution image reconstruction applied to an active millimeter wave imaging system based on compressive sensing
Author(s): Ümit Alkuş; Esra Şengün Ermeydan; Asaf Behzat Şahin; İlyas Çankaya; Hakan Altan
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Paper Abstract

The development of passive and active millimeter wave imaging systems is progressing rapidly fueled by the need for many applications in the area of security and defense. Imaging schemes that may either utilize array detectors or single detectors in scan architectures offer suffer from poor resolution due to the longer wavelengths used and the limits of the optical system in terms of lens and mirror dimensions. In order to overcome this limit, super-resolution techniques can be employed to enhance the resolution of the imaging system. Here, a form of this technique based on oversampling is applied to reconstruct the image of a target which is acquired using compressive sensing based on scanning the image plane using randomly patterned masks with fixed pixel sizes. The mm-wave stand-off imaging system uses a 93 GHz center frequency source and heterodyne sub-harmonic receiver place in a bi-static configuration to image a target in reflection mode. The image of the target is projected onto a mechanically scanned spatial light modulator (SLM), which is a patterned two-dimensional mask that is translated along one axis. In order to improve the resolution of the image, the masks are shifted by half the pixel size (2.5mm). To enhance the resolution of the image, the patterns are shifted by smaller steps, thereby each pixel is oversampled and the resulting new pattern and detected intensity is fed into the CS algorithm to reconstruct the image of the target. After the image reconstruction process, sharper edges are observed for a circular object of 12mm diameter compared to the image acquired by whole pixel step scanning.

Paper Details

Date Published: 6 October 2017
PDF: 8 pages
Proc. SPIE 10439, Millimetre Wave and Terahertz Sensors and Technology X, 104390B (6 October 2017); doi: 10.1117/12.2278022
Show Author Affiliations
Ümit Alkuş, Middle East Technical Univ. (Turkey)
Esra Şengün Ermeydan, Yıldırım Beyazıt Univ. (Turkey)
Asaf Behzat Şahin, Yıldırım Beyazıt Univ. (Turkey)
İlyas Çankaya, Yıldırım Beyazıt Univ. (Turkey)
Hakan Altan, Middle East Technical Univ. (Turkey)


Published in SPIE Proceedings Vol. 10439:
Millimetre Wave and Terahertz Sensors and Technology X
Neil A. Salmon; Sherif Sayed Ahmed, Editor(s)

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