Laser & Optoelectronics Progress, Volume. 60, Issue 18, 1811012(2023)
Multipolarization Image Evaluation for Passive Terahertz Imaging Detection
Figures & Tables(10)
Fig. 1. Emissivity and brightness temperature properties of typical materials, H and V represent horizontal polarization and vertical polarization, respectively. (a) Emissivity; (b) brightness temperature
Fig. 2. Four linear polarization and six polarization parameter images from imaging experiment. (a) 0°; (b) 45°; (c) 90°; (d) -45°; (e) T
Fig. 3. Four linear polarization and six polarization parameter images from imaging simulation. (a) 0°; (b) 45°; (c) 90°; (d) -45°; (e) T
Fig. 4. ROC curves of imaging experiment. (a) Metal knife; (b) paper money; (c) wheat flour; (d) metal gun
Table 1. Parameter setting of passive terahertz imaging simulation for hidden objects carried by human body
View tableTable 1. Parameter setting of passive terahertz imaging simulation for hidden objects carried by human body
Parameter Value Parameter Value Center frequency /GHz 94 Skin physical temperature /K 307 Polarization mode /（°） 0，45，90，-45 Object physical temperature /K 302 3 d B beamwidth /（°）0.4 Ambient physical temperature /K 298 Thermal sensitivity /K 0.5 Skin permittivity 7.1‒j3.6 Observation distance /m 3 Ceramic permittivity 5.67‒j0.0085 Pixel size 240×130 Clothing attenuation /dB 0.4
Table 2. Calculation results of traditional global no-reference evaluation indexes for experimental data
View tableTable 2. Calculation results of traditional global no-reference evaluation indexes for experimental data
Parameter TA0° TA45° TA90° TA-45° T I T Q T U TII DOLP AOP Entropy 6.887 6.855 6.783 6.808 6.589 6.265 6.186 6.374 6.006 7.992 MG 0.047 0.047 0.046 0.046 0.033 0.068 0.068 0.024 0.064 0.319 Laplacian 0.034 0.033 0.033 0.033 0.017 0.072 0.074 0.008 0.072 1.560 DFT 2823 2768 2721 2756 2156 3442 3436 1727 3201 14491 DCT 9.517 9.439 9.423 9.426 6.786 13.715 13.825 4.8640 13.631 63.038 STD 0.229 0.221 0.226 0.231 0.244 0.053 0.051 0.256 0.056 0.286 BRISQUE 39.328 38.667 37.979 39.191 38.357 43.655 44.794 34.303 44.351 65.803 NIQE 14.838 11.314 14.051 13.312 11.637 20.436 20.887 10.844 21.464 64.810 PIQE 57.268 57.498 57.706 57.479 48.090 70.061 70.750 38.674 68.829 80.672
Table 3. Calculation results of traditional global no-reference evaluation indexes for simulation data
View tableTable 3. Calculation results of traditional global no-reference evaluation indexes for simulation data
Parameter TA0° TA45° TA90° TA-45° T I T Q T U TII DOLP AOP Entropy 6.441 6.460 6.440 6.477 6.140 6.469 6.440 5.831 6.530 7.993 MG 0.050 0.051 0.050 0.052 0.041 0.079 0.083 0.032 0.089 0.317 Laplacian 0.038 0.039 0.037 0.039 0.024 0.095 0.106 0.015 0.126 1.531 DFT 2312 2311 2225 2329 2093 2620 2668 1944 3019 9416 DCT 8.372 8.481 8.245 8.582 6.885 12.560 13.146 5.646 14.573 49.506 STD 0.221 0.216 0.205 0.220 0.233 0.089 0.083 0.248 0.107 0.285 BRISQUE 40.724 40.478 38.219 39.012 38.977 44.079 44.491 37.320 49.882 65.156 NIQE 17.071 16.206 15.318 16.689 17.026 21.091 21.798 14.084 25.444 79.137 PIQE 58.754 57.491 57.274 59.863 53.744 70.283 72.086 49.964 70.957 80.152
Table 4. Assessment results of DSNR of four hidden objects from imaging experiment
View tableTable 4. Assessment results of DSNR of four hidden objects from imaging experiment
Hidden object TA0° TA45° TA90° TA-45° T I T Q T U TII DOLP AOP Metal knife 2.907 3.585 3.216 3.002 3.627 -4.234 -2.373 4.136 -1.036 -16.407 Paper money 5.278 5.168 4.213 5.439 5.747 -2.341 -8.753 6.319 -5.187 -11.024 Wheat flour 3.815 3.503 1.942 3.003 3.278 -3.379 -5.857 3.640 -6.620 -7.590 Metal gun 3.689 3.323 2.414 3.226 3.975 -5.121 -7.222 4.411 -12.528 -10.507
Table 5. Observer subjective local evaluation results of experimental data
View tableTable 5. Observer subjective local evaluation results of experimental data
Object TA0° TA45° TA90° TA-45° T I TII Metal knife 2.54 3.39 3.31 2.43 3.85 4.28 Paper money 3.85 2.80 2.63 3.39 3.78 4.02 Wheat flour 3.33 2.41 3.22 3.15 3.72 4.33 Metal gun 2.91 2.67 2.39 3.69 3.46 4.09
Table 6. Observer subjective local evaluation results of simulation data
View tableTable 6. Observer subjective local evaluation results of simulation data
Object TA0° TA45° TA90° TA-45° T I TII Ceramic rod 2.17 3.89 2.85 3.02 3.15 4.44 Wood knife 2.83 2.80 2.37 3.26 4.17 4.28 Stone knife 3.20 2.81 2.09 3.24 3.94 4.35 Ceramic gun 3.41 3.41 2.7 3.57 4.06 4.37 Cigarette lighter 3.26 2.37 2.87 2.91 4.26 4.22
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Yayun Cheng, Xun Tian, Nannan Wang, Jiaran Qi, Jinghui Qiu. Multipolarization Image Evaluation for Passive Terahertz Imaging Detection[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811012
Paper Information
Category: Imaging Systems
Received: May. 15, 2023
Accepted: Jun. 20, 2023
Published Online: Sep. 19, 2023
The Author Email: Nannan Wang (wangnn@hit.edu.cn)
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