Passive millimeter-wave imaging for security and safety applications
| Autor: | Keiichi Morichika, Jun Uemura, Hiroyasu Sato, Kota Yamada, Hirotaka Niikura, Tsuyoshi Hasegawa, Shigeto Kato, Kunio Sawaya, Jun Nakada, Masamune Takeda, Junichi Takahashi, Matsuzaki Tomohiko, Koji Mizuno, Hirai Haruyuki |
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| Rok vydání: | 2010 |
| Předmět: |
Beam diameter
business.industry Computer science ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Reflector (antenna) Dielectric Directivity law.invention Lens (optics) Optics Sensor array law Computer Science::Computer Vision and Pattern Recognition Extremely high frequency Antenna (radio) Image sensor business Image resolution Fermi Gamma-ray Space Telescope |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| Popis: | 77 GHz passive millimeter wave (PMMW) imaging camera for the purpose of security is developed. In order to detect concealed objects in clothes without hindrance to flow of people at airport security checks, video rate imaging is realized using one-dimensional imaging sensor array of 25 elements and a flapping reflector. As receiving antennas, novel antipodal Fermi antenna (APFA) having required characteristics for passive imaging such as broad bandwidth to obtain enough power, axially symmetric directivity with 10dB beam width of 35 degrees to obtain optimum coupling with dielectric lens, narrow width geometry for high spatial resolution of imaging is used. Real-time calibration (RTC) technique is introduced to eliminate the drift of receiving circuits. Interpolation technique to improve the quality of image and marking software for screening of suspicious objects are also developed. High spatial resolution of 20 mm is obtained by using developed imaging camera. |
| Databáze: | OpenAIRE |
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