Proposed New AV-Type Test-Bed for Accurate and Reliable Fish-Eye Lens Camera Self-Calibration

Choi, Kyoung-Hee; Kim, Changjae

doi:10.3390/s21082776

Cited by 5 publications

(1 citation statement)

References 45 publications

(82 reference statements)

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“…However, miniature camera lenses using traditional even aspheric surfaces are unable to provide superiority optical performance. To meet the stringent requirements of users, there are two mainstream solutions for realizing distortion free or low-distortion in wide angle camera lens: imaging processing [1] and optical distortion correction. The emerging optical system utilizes freeform optics to realize ultra-slim and low-distortion.…”

Section: Introductionmentioning

confidence: 99%

Realizing low-distortion in wide-angle lens with freeform optics technique

Zhuang

Parent

Roulet

et al. 2022

Current Developments in Lens Design and Optical Engineering XXIII

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Distortion is one major shortcoming of conventional wide-angle lens. The correction of distortion can maximize field of view in a wide-angle lens and benefit natural scenes. In this paper, we propose a compact wide-angle lens utilizing freeform surfaces to address the shortcoming. The design approaches, including the starting point selection, freeform surface conversion scheme, and system optimization, are discussed in detail. Moreover, freeform diagnostic tools are developed aiming to facilitate system optimization and visualize the critical aspects of optical performance. The simulation results are demonstrated and discussed. Analysis results demonstrate that the design strategies proposed in this paper have been shown to be effective in reducing distortion as well as improving optical performance. We envision that the proposed design schemes will have a positive effect on research and application values for wide angle lens system.

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Section: Introductionmentioning

confidence: 99%

Realizing low-distortion in wide-angle lens with freeform optics technique

Zhuang

Parent

Roulet

et al. 2022

Current Developments in Lens Design and Optical Engineering XXIII

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show abstract

Freeform wide-angle camera lens enabling mitigable distortion

Zhuang¹,

Parent²,

Roulet³

et al. 2022

Appl. Opt.

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Allowing natural scenes as well as maximizing field of view (FoV) can benefit from the minimization of distortion for the wide-angle camera. The wide-angle camera utilizing freeform surfaces for mitigating distortions, either barrel distortion or pincushion distortion, is therefore of interest. In this paper, the designs of using all-aspherical surfaces and aspherical surfaces combined with freeform surfaces are investigated. To minimize the deviation before and after converting from aspherical surfaces to freeform surfaces, a mathematical conversion scheme is derived. By applying it to the design example, the methodology is shown to be effective in the case of an optical system with a large number of aspherical/freeform surfaces. Additionally, custom freeform analysis tools are developed for quantitative analysis and visualization of the critical characteristics of optical performance, namely, a 2D lateral color field map, 2D relative illumination field map, 2D spot radius field map, and 2D average modulation transfer function (MTF) field map. Compared to classical all-aspherical design, simulation results show that freeform design has the capability to reduce distortion, and other performances such as relative illumination, spot size, and MTF can also be improved, even though there are some compromises on the peripheral FoV. The design approach will have potential important research and application values for lens systems utilized in miniature camera lenses, especially the wide FoV capability.

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A Framework of Wearable Sensor-System Development for Urban 3D Modeling

Choi

Kim

2022

Applied Sciences

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Recently, with the expansion of the smart city and autonomous driving-related technologies within complex urban structures, there has been an increase in the demand for precise 3D modeling technology. Wearable sensor systems can contribute to the construction of seamless 3D models for complex urban environments, as they can be utilized in various environments that are difficult to access using other sensor systems. Consequently, various studies have developed and utilized wearable sensor systems suitable for different target sites and purposes. However, studies have not yet suggested an overall framework for building a wearable system, including a system design method and an optimal calibration process. Therefore, this study aims to propose a framework for wearable system development, by presenting guidelines for wearable sensor system design and a calibration framework optimized for wearable sensor systems. Furthermore, calibration based on point–plane correspondences is proposed. A wearable sensor system was developed based on the proposed guidelines and it efficiently acquired data; the system calibration and data fusion results for the proposed framework showed improved performance in a comparative evaluation.

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Proposed New AV-Type Test-Bed for Accurate and Reliable Fish-Eye Lens Camera Self-Calibration

Cited by 5 publications

References 45 publications

Realizing low-distortion in wide-angle lens with freeform optics technique

Realizing low-distortion in wide-angle lens with freeform optics technique

Freeform wide-angle camera lens enabling mitigable distortion

A Framework of Wearable Sensor-System Development for Urban 3D Modeling

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