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Improving Resolution in Millimeter-Wave Imaging Systems

Kazemi, Mohmoud | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51073 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shabany, Mahdi; Kavehvash, Zahra
  7. Abstract:
  8. Nowadays, millimeter-wave imaging is widely used in security and medical applications. The growing threat from terrorist attacks is driven research on novel ways to enhance security inspection systems. Millimeter-wave imaging not only is an effective option of penetrating into dielectric materials including cloth, but also provides suitable imaging resolution. Moreover, millimeter-wave imaging is capable of identifying different materials making it a promising option for concealed weapon detection. In spite of X-ray, millimeter-wave imaging is non-ionizing, allowing for non-invasive imaging. In this thesis, first we investigate different millimeter-wave imaging systems and reconstruction algorithms. Moreover, we study such imaging systems, especially multi-static systems, in k-space domain and discuss the problem of the reconstruction algorithms. Based on this analysis, we propose the modified reconstruction algorithm and compare it with the current reconstruction algorithms, and also, rotate the transmitter antennas in multi-static arrays to enhance the imaging resolution. The provided simulation and experimental measurements prove the considerable quality enhancement in the proposed approach. Using the proposed structure and algorithm, the average improvement in PSNR, SSIM and DIC metrics of 2.87 dB, 0.22 and 0.17, are obtained, respectively. Also we implemented some reconstruction algorithms. In this thesis, PCA method is implemented on FPGA and GPU architectures. Also, the current trend of reconstruction algorithms based on fast-fourier is challenged, and a real-time GPU implementation of basic algorithms is presented
  9. Keywords:
  10. Image Reconstruction ; Graphic Processing ; Field Programmable Gate Array (FPGA) ; Super-Resolution ; Multistatic Imaging ; Millimeter-Wave Imaging

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