Stereo Image Acquisition System Using Optical Axis Movable Liquid Crystal Lens

Fig. 3. Interference results for different optical axis positions. (a) Optical axis moving from (0,0) to (-0.4 mm,0); (b) optical axis moving from (0,0) to (0.4 mm,0)

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Fig. 4. Optical model of imaging system

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Fig. 5. Pinhole camera model based on optical axis movement

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Fig. 6. Physical device diagram of designed system

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Fig. 7. Experimental setup based on movement of optical axis of liquid cystal lens

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Fig. 8. Image acquisition results based on optical axis movement of liquid crystal lens. (a) Acquisition result for liquid crystal lens with optical axis at (-0.4 mm, 0); (b) acquisition result for liquid crystal lens with optical axis at (0.4 mm, 0); (c) comparison of images in rectangular box areas from Figs. 8(a) and 8(b)

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Fig. 9. Disparity results based on variable optical flow algorithm. (a) Original image of optical flow result; (b) optical flow result after grayscale inversion

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Fig. 10. Fitting relationship between actual distance value and average grayscale value

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Fig. 11. Depth measurement experiment of close range object. (a) Acquisition result for liquid crystal lens with optical axis at (-0.4 mm, 0); (b) acquisition result for liquid crystal lens with optical axis at (0.4 mm, 0); (c) comparison of images in rectangular box areas from Figs. 11(a) and 11(b); (d) grayscale disparity result based on optical flow algorithm

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Fig. 12. Results of small baseline images obtained by conventional binocular vision algorithms. (a) SGM; (b) SAD

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Table 1. Driving voltage parameters of liquid crystal lens in two optical axis states
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Table 1. Driving voltage parameters of liquid crystal lens in two optical axis states
Parameter （-0.4 mm，0）（0.4 mm，0）
V₁ 0.51 0.77
V₂ 0.63 0.63
V₃ 0.77 0.51
V₄ 0.63 0.63
P₁ /（ $°$ ） 0 0
P₂ /（ $°$ ） 0 0
P₃ /（ $°$ ） 90.01 90.01
P₄ /（ $°$ ） 95.00 95.00

Table 2. Average grayscale values of rectangular box areas in Fig. 9 (b) and corresponding actual distance values
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Table 2. Average grayscale values of rectangular box areas in Fig. 9 (b) and corresponding actual distance values
Region of interest No. 1 2 3
Average grayscale value 173.1 148.6 111.0
Actual distance value /cm 26.0 51.0 78.0

Table 3. Summary of depth measurement experimental data
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Table 3. Summary of depth measurement experimental data
Region of interest No. 1 2 3
Average grayscale value 177.0 156.4 144.9
Optical flow value /pixel 25.6 22.2 20.4
Calculated depth value /cm 5.9 6.8 7.4
Actual distance value /cm 6.5 7.6 9.1
Error in result /% 9.2 10.5 18.7

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Chaojie Wan, Zhiqiang Liu, Lühan Xu, Huihai Li, Mao Ye. Stereo Image Acquisition System Using Optical Axis Movable Liquid Crystal Lens[J]. Acta Optica Sinica, 2023, 43(3): 0311002

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Paper Information

Category: Imaging Systems

Received: Jun. 30, 2022

Accepted: Aug. 10, 2022

Published Online: Feb. 13, 2023

The Author Email: Ye Mao (mao_ye@uestc.edu.cn)

DOI:10.3788/AOS221402

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Driving voltage parameters of liquid crystal lens in two optical axis states

Table 1. Driving voltage parameters of liquid crystal lens in two optical axis states

Table 2. Average grayscale values of rectangular box areas in Fig. 9 (b) and corresponding actual distance values

Table 2. Average grayscale values of rectangular box areas in Fig. 9 (b) and corresponding actual distance values

Table 3. Summary of depth measurement experimental data

Table 3. Summary of depth measurement experimental data