Terahertz Light Field Imaging Occlusion Removing Algorithm Based on Multi-Perspective Synthetic Aperture

Moxuan Yang; Yuanmeng Zhao; Fengxia Zhu; Hongfei Zhang; Zhilong Li; Cunlin Zhang

doi:10.3788/AOS202242.0911001

Acta Optica Sinica, Volume. 42, Issue 9, 0911001(2022)

Terahertz Light Field Imaging Occlusion Removing Algorithm Based on Multi-Perspective Synthetic Aperture

Moxuan Yang^1,2,3,4, Yuanmeng Zhao^1,2,3,4、*, Fengxia Zhu^1,2,3,4, Hongfei Zhang^1,2,3,4, Zhilong Li^1,2,3,4, and Cunlin Zhang^1,2,3,4

Author Affiliations

¹Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China

²Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing 100048, China

³Beijing Advanced Innovation Center for Imaging Theory and Technology, Beijing 100048, China

⁴Department of Physics, Capital Normal University, Beijing 100048, China

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Figures & Tables(10)

Fig. 1. Comparison between large aperture camera and single camera

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Fig. 2. Processing flowchart of proposed algorithm

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Fig. 3. Reconstruction process of sub-image array

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Fig. 4. Estimation result of minimum generalization error

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Fig. 5. Digital refocus images with different depths. (a) n=100 mm; (b) n=110 mm; (c) n=120 mm; (d) n=130 mm; (e) n=140 mm; (f) n=150 mm

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Fig. 6. Curve signals before and after filtering

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Fig. 7. Reconstructed images processed by different algorithms. (a) Visible image; (b) original image; (c) digital refocusing algorithm; (d) proposed algorithm; (e) unocclusion

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Fig. 8. Influence of occlusion with different thickness on reconstructed image. (a) n=5 cm; (b) n=6 cm; (c) n=7 cm

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Table 1. Objective evaluation of image quality with reference
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Table 1. Objective evaluation of image quality with reference
Index Original image Ref. [16] Proposed algorithm
MSE 1720.875764 35.411535 3.320661
MAE 11.694088 1.604126 0.161418
SNR 70.761419 87.627467 97.906668
PSNR 15.773308 32.639356 42.918558

Table 2. Objective evaluation of image quality without reference

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Table 2. Objective evaluation of image quality without reference

Index	Original image	Ref. [16]	Proposed algorithm	No shielding image
Brenner gradient function	1483.1001	1492.1906	1563.6797	1575.1642
Roberts function	20.594340	20.766180	21.215800	21.982600
SMD	12.2614	12.1249	12.5359	13.0081
EOG	1294.6932	1331.1284	1338.5196	1349.5099

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Moxuan Yang, Yuanmeng Zhao, Fengxia Zhu, Hongfei Zhang, Zhilong Li, Cunlin Zhang. Terahertz Light Field Imaging Occlusion Removing Algorithm Based on Multi-Perspective Synthetic Aperture[J]. Acta Optica Sinica, 2022, 42(9): 0911001

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