Light-Field Camera for Fast Switching of Time-Sequential Two-Dimensional and Three-Dimensional Image Capturing at Video Rate

Joo, K.; Park, Minkyu; Park, Hee-Won; Lee, Tae-Hyun; Lim, Young-Tae; Erdenebat, Munkh-Uchral; Lee, Hyun; Lee, Gwangsoon; Kim, Nam

doi:10.1109/tie.2019.2935992

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…[ 3,4 ] Motivated by these unique features, bionics on the geometrics and optical performance of natural compound eyes have been investigated and have shown great potential in medical endoscopic imaging, digital cameras, and wide‐field imaging. [ 5–10 ]…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Yang

et al. 2022

Advanced Optical Materials

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compound eyes with distinguished advantages, such as large field of view (FOV), low aberration, high sensitivity to moving objects, and high temporal resolution. [2] Moreover, the periodically arranged nanoripples make the eyes have superhydrophobicity and anti-fogging property. [3,4] Motivated by these unique features, bionics on the geometrics and optical performance of natural compound eyes have been investigated and have shown great potential in medical endoscopic imaging, digital cameras, and wide-field imaging. [5][6][7][8][9][10] In recent years, various methods have been proposed to fabricate artificial compound eyes (ACEs), such as self-assembly method, inkjet printing and air-assisted deformation, single-pulse femtosecond laser wet etching with thermal embossing, and so on. [11][12][13][14][15] However, in highly humid or low-temperature environments, fog easily forms on the surface of these ACE elements and thus scatters light by the condensed water droplets. Up to now, very few researchers have achieved antifogging surfaces that could be used for optical imaging purposes. Generally speaking, they are working through the following two aspects. The first one is superhydrophobic-induced surfaces that prevent fog from adhering to the micro-lens surface. [16] Another one is superhydrophilic-induced surfaces that can suppress fogging behavior by the rapid spread of condensing water droplets. [17] The disadvantages of these methods are obvious. Superhydrophobic surfaces always require hexagonal nipples or close-packed protuberances of nanoscale on the surface of microstructures, which brings a great challenge to current micro/nano manufacturing processes, and is not conducive to mass production. Furthermore, these superwetting surfaces are unstable when suffering from high pressure, long-term working, or abrasion, which results in the loss of anti-fogging ability. Therefore, it still remains a challenge to develop a more facile process to fabricate bioinspired artificial compound eyes that reproduces the functionality of the natural compound eyes.It is interesting that Nepenthes pitcher plants can prevent insects to stand on their pitcher and, instead make them slide down from the rim to the bottom. [18] This excellent characteristic benefits from a layer of lubricating fluid stored in Curved artificial compound eyes (ACEs) attract enormous research interest owing to their potential applications in medical devices, surveillance imaging, target tracking, and so on. However, fog, dust, or other liquids are likely to condense on the device surface under a humid, low-temperature environment or outdoors, thus affecting the optical performance. In this work, a multifunctional ACE (MF-ACE) is fabricated by a combination of i) femtosecond laser wet etching, ii) soft lithography, and iii) polydimethylsiloxane (PDMS) swelling methods. The fabricated device is close-packed with over 3000 microlenses (≈108 µm diameter and ≈15 µm height) on a spherical macrolens (6.56 cm diameter and 0.87 cm height). The trapped silicone...

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Section: Introductionmentioning

confidence: 99%

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Yang

et al. 2022

Advanced Optical Materials

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“…Surface-protective optical coatings are a promising application field for self-healing polymers. Recently, various light-based imaging systems have been used to acquire three-dimensional (3D) spatial information − as well as conventional two-dimensional (2D) images in autonomous vehicles, , drones, , personal mobile information devices, , robots, and virtual or augmented reality glasses . Depending on the application field and light-control principles, imaging modules have been developed from conventional 2D vision sensors to 3D stereoscopic , or light-field cameras, , structured-light-based 3D imaging devices, , time-of-flight sensors, , light detection and ranging (LiDAR) devices, , and 3D holographic imaging systems .…”

Section: Introductionmentioning

confidence: 99%

NIR-Triggered High-Efficiency Self-Healable Protective Optical Coating for Vision Systems

Jeong

Lee

Bae

et al. 2023

ACS Appl. Mater. Interfaces

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Recently, self-healing materials have evolved to recover specific functions such as electronic, magnetic, acoustic, structural or hierarchical, and biological properties. In particular, the development of self-healing protection coatings that can be applied to lens components in vision systems such as augmented reality glasses, actuators, and image and time-of-flight sensors has received intensive attention from the industry. In the present study, we designed polythiourethane dynamic networks containing a photothermal N-butyl-substituted diimmonium borate dye to demonstrate their potential applications in self-healing protection coatings for the optical components of vision systems. The optimized self-healing coating exhibited a high transmittance (∼95% in the visible-light region), tunable refractive index (up to 1.6), a moderate Abbe number (∼35), and high surface hardness (>200 MPa). When subjected to near-infrared (NIR) radiation (1064 nm), the surface temperature of the coating increased to 75 °C via the photothermal effect and self-healing of the scratched coatings occurred via a dynamic thiourethane exchange reaction. The coating was applied to a lens protector, and its self-healing performance was demonstrated. The light signal distorted by the scratched surface of the coating was perfectly restored after NIR-induced self-healing. The photoinduced self-healing process can also autonomously occur under sunlight with low energy consumption.

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“…Microlens arrays (MLAs) and MLA-based artificial compound eyes (ACEs) play a key role in advanced micro-optical systems (Pan et al, 2007 ; Song et al, 2013 ; Gorzelak et al, 2014 ; Petsch et al, 2016 ; Lin et al, 2018 ). By taking advantages of small size, high integration, and striking optical capability, MLAs and ACEs are widely applied in light-field regulation (Deng et al, 2014 ; Wei et al, 2018 ; Zhou et al, 2018 ; Sohna et al, 2019 ), fiber coupling (Elsherif et al, 2019 ; Liu et al, 2019 ; Orth et al, 2019 ), lab-on-chip devices (Fei et al, 2011 ; Lv et al, 2016 ; Vespini et al, 2016 ), biochemical observation (Ma et al, 2014 ; Holzner et al, 2018 ), laser microfabrication (Bekesi et al, 2010 ; Li et al, 2020 ), solar cells (Chen Y. et al, 2013 ), sensors (Zanella et al, 2020 ), three-dimensional imaging (Li et al, 2016 ; Kim et al, 2019 ; Zhang et al, 2019 ; Joo et al, 2020 ; Qin et al, 2020 ; Zhao et al, 2020 ), and light extraction (Shin et al, 2018 ; Zhou et al, 2019a , b ). However, the normal use of the MLA is usually restricted by many limitations.…”

Section: Introductionmentioning

confidence: 99%

Mini-Review on Bioinspired Superwetting Microlens Array and Compound Eye

et al. 2020

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Microlens arrays (MLAs) and MLA-based artificial compound eyes (ACEs) are the important miniaturized optical components in modern micro-optical systems. However, their optical performance will seriously decline once they are wetted by water droplets (such as fog, dew, and rain droplets) or are polluted by contaminations in a humid environment. In this mini-review, we summarize the research works related to the fabrication of superwetting MLAs and ACEs and show how to integrate superhydrophobic and superoleophobic microstructures with an MLA. The fabrication strategy can be split into two categories. One is the hybrid pattern composed of the MLA domain and the superwetting domain. Another is the direct formation of superwetting nanostructures on the surface of the microlenses. The superhydrophobicity or superoleophobicity endows the MLAs and ACEs with liquid repellence and self-cleaning function besides excellent optical performance. We believe that the superwetting MLAs and ACEs will have significant applications in various optical systems that are often used in the humid or liquid environment.

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Light-Field Camera for Fast Switching of Time-Sequential Two-Dimensional and Three-Dimensional Image Capturing at Video Rate

Cited by 9 publications

References 42 publications

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

Bioinspired Anti‐Fogging and Anti‐Fouling Artificial Compound Eyes

NIR-Triggered High-Efficiency Self-Healable Protective Optical Coating for Vision Systems

Mini-Review on Bioinspired Superwetting Microlens Array and Compound Eye

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