无偏振片液晶透镜深度估计

Lai Wenjie, 赖文杰; Liu Zhiqiang, 刘志强; Sun Tao, 孙涛; Hu Xiao, 胡晓

doi:10.3788/aos230562

光学学报

2023

DOI: 10.3788/aos230562

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无偏振片液晶透镜深度估计

赖文杰 Lai Wenjie,

刘志强 Liu Zhiqiang,

孙涛 Sun Tao

et al.

Abstract: Objective Visionbased depth estimation is an important research direction of computer vision, which is of great significance to threedimensional (3D) reconstruction, semantic segmentation, navigation, etc. The monocular depth estimation scheme has the advantages of low cost and easy installation, which cannot be realized by binocular stereo vision and lidar, and it has received more and more attention in recent years. There is a strong correlation between the outof -

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Cited by 4 publications

References 22 publications

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True-color and super-resolution imaging using an optical axis shiftable liquid crystal lens

Zhou,

Liu,

Chen

et al. 2024

Appl. Opt.

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This study explores the utilization of a liquid crystal lens with a shiftable axis for true-color and super-resolution imaging. By maintaining the optical power and shifting the axis of the liquid crystal lens, precise sub-pixel level shifts are applied to the images formed on the sensor, enabling the construction of true-color and super-resolution images. A comparative analysis with the traditional interpolation-based demosaicing method reveals that true-color imaging not only enhances clarity and effective pixel count, but also significantly reduces occurrences of false color, edge aliasing, and color moiré artifacts.

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True-color and super-resolution imaging using an optical axis shiftable liquid crystal lens

Zhou,

Liu,

Chen

et al. 2024

Appl. Opt.

View full text Add to dashboard Cite

show abstract

Method for increasing the utilization rate of birefringence in liquid crystal lenses

Feng,

2023

Opt. Express

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We propose a method to increase the utilization rate of birefringence in liquid crystal (LC) lenses. The method involves designing electrode patterns based on the phase response curve of the LC material, enabling the lenses to operate across a wide range of driving voltages while generating the desired phase profile. The underlying principle of this technique is discussed in detail. Electrode patterns have been successfully designed for positive and negative cylindrical LC lenses. The experimental results demonstrate that the designed lenses generate a parabolic phase profile even when the driving voltage exceeds the linear response region. The utilization rate of LC birefringence for the positive lens has increased from 41.3% to 69.7%, indicating a 68.8% increase from the original. For the negative lens, the utilization rate has risen from 41.8% to 68.7%, representing a 64.4% increase from the original.

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Refractive Fresnel liquid crystal lenses driven by two voltages

Feng,

2023

Opt. Express

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We propose and demonstrate a high-performance refractive Fresnel liquid crystal (LC) lens with a simple electrode design. The interconnected circular electrodes enable the creation of a parabolic voltage distribution within each Fresnel zone using only two driving voltages. By controlling these voltages within the linear response region of LC material, the desired parabolic phase profile can be achieved. We provide a detailed discussion on the electrode structure design methodology and operating principles of the lens. In our experiments, we constructed a four-zone Fresnel LC lens with a total aperture of 8 mm. The results show that the optical power of the lens can be continuously adjusted from −1.30 D to +1.33 D. Throughout the process of electrically tuning the optical power, the phase distribution within each Fresnel zone maintains a parabolic profile. These results demonstrate the high-performance of the proposed Fresnel LC lens.

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无偏振片液晶透镜深度估计

Cited by 4 publications

References 22 publications

True-color and super-resolution imaging using an optical axis shiftable liquid crystal lens

True-color and super-resolution imaging using an optical axis shiftable liquid crystal lens

Method for increasing the utilization rate of birefringence in liquid crystal lenses

Refractive Fresnel liquid crystal lenses driven by two voltages

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