Prof. Dewen Cheng Profile

Prof. Dewen Cheng

at Beijing Institute of Technology

SPIE Involvement:

Conference Program Committee | Author

Publications (59)

Proceedings Article | 28 November 2023 Poster + Paper

Generating off-axis reflective imaging systems consisting of flat phase elements based on deep learning

Boyu Mao, Tong Yang, Huiming Xu, Dewen Cheng, Yongtian Wang

Proceedings Volume 12765, 127651E (2023) https://doi.org/10.1117/12.2686762

KEYWORDS: Imaging systems, Education and training, Design and modelling, Machine learning, Ray tracing, Chemical elements, Optical components, Systems modeling, Holographic optical elements, Distortion

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Proceedings Article | 28 November 2023 Poster + Paper

Optical-digital joint optimization enables advanced specifications freeform imaging system design

Huiming Xu, Tong Yang, Dewen Cheng, Yongtian Wang

Proceedings Volume 12765, 127651Z (2023) https://doi.org/10.1117/12.2688784

KEYWORDS: Image restoration, Imaging systems, Point spread functions, Image processing, Ray tracing, Optical surfaces, Image quality

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Proceedings Article | 23 January 2023 Paper

Design of retinal projection near-eye display with extended eyebox based on freeform holographic elements

Yongdong Wang, Tong Yang, Dongwei Ni, Dewen Cheng, Yongtian Wang

Proceedings Volume 12557, 125572U (2023) https://doi.org/10.1117/12.2651772

KEYWORDS: Imaging systems, Zoom lenses, Eye, Holographic optical elements, Holography, Chemical elements, Mirrors, Collimation, Retina, Optical design

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Proceedings Article | 20 January 2023 Paper

Fast irradiance evaluation of freeform illumination lenses based on deep learning

Haisong Tang, Zexin Feng, Dewen Cheng, Yongtian Wang

Proceedings Volume 12559, 125590F (2023) https://doi.org/10.1117/12.2652055

KEYWORDS: Freeform optics, Neural networks, Lens design, Computer simulations

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Proceedings Article | 20 January 2023 Paper

Design and exploration of freeform three-mirror imaging systems with integrated primary and tertiary mirrors using same expression

Lijun Zhou, Tong Yang, Dewen Cheng, Yongtian Wang

Proceedings Volume 12559, 125590B (2023) https://doi.org/10.1117/12.2651242

KEYWORDS: Design and modelling, Imaging systems, Mirrors, Tolerancing, Off axis mirrors, Image quality, Zernike polynomials

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Proceedings Article | 21 December 2022 Presentation + Paper

Design of a wide field-of-view, compact head-mounted display based on free-form prisms tiling

Danyang Li, Dewen Cheng, Xueyan Jiang, Hailong Chen, Cheng Yao, Qiwei Wang, Yongtian Wang

Proceedings Volume 12315, 1231502 (2022) https://doi.org/10.1117/12.2643889

KEYWORDS: Prisms, Distortion, Head-mounted displays, Augmented reality, Optical resolution, Imaging systems, Freeform optics

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Proceedings Article | 21 December 2022 Poster + Presentation + Paper

Optical design of a wide linear field-of-view, high resolution, and compact f-theta laser scanning system

Tian Zhang, Hailong Chen, Wenfang Luo, Hongye Du, Dewen Cheng, Yongtian Wang

Proceedings Volume 12315, 123151J (2022) https://doi.org/10.1117/12.2643829

KEYWORDS: Laser scanners, Imaging systems, Optical design, Optical scanning systems, Freeform optics

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Proceedings Article | 21 December 2022 Poster + Presentation + Paper

Optical design of a wide-angle pinhole lens for VR and AR inspection

Yang Li, Dewen Cheng, Xueliang Shi, Yongtian Wang

Proceedings Volume 12315, 1231513 (2022) https://doi.org/10.1117/12.2641854

KEYWORDS: Virtual reality, Modulation transfer functions, Tolerancing, Augmented reality, Head-mounted displays, Inspection, Optical design, Optical inspection

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Proceedings Article | 3 October 2022 Presentation + Paper

Measurement of refractive index and liquid diffusion coefficient based on focal plane imaging method

Li Wei, Haifeng Gao, Haitao Zhou, Dewen Cheng

Proceedings Volume 12217, 122170A (2022) https://doi.org/10.1117/12.2636005

KEYWORDS: Liquids, Diffusion, Refractive index, Ray tracing, Cylindrical lenses

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Proceedings Article | 21 December 2021 Paper

Visual comfort evaluation of table-HUD

Feiyan Zhou, Dewen Cheng, Wenrui Shen, Yongtian Wang

Proceedings Volume 12063, 120630P (2021) https://doi.org/10.1117/12.2607137

KEYWORDS: Visualization, Heads up displays, Video, Visual analytics, Computing systems, Statistical analysis, Reliability, Tablets, Eye, LCDs

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Proceedings Article | 24 November 2021 Paper

The luminance and chromaticity measurement of head-mounted displays

Wenjie Zha, Qiwei Wang, Dewen Cheng, Yongtian Wang

Proceedings Volume 12063, 120630E (2021) https://doi.org/10.1117/12.2606683

KEYWORDS: Head-mounted displays, Spectroscopy, Augmented reality, Virtual reality, Optical fibers, Displays, Optical testing

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Proceedings Article | 24 November 2021 Paper

Design of a virtual image distance measurement system for augmented reality/virtual reality display

Qi Zuo, Dewen Cheng, Cheng Yao, Haoran Li, Hailong Chen, Yue Liu, Yongtian Wang

Proceedings Volume 12063, 120630M (2021) https://doi.org/10.1117/12.2607093

KEYWORDS: Virtual reality, Imaging systems, Lens design, Augmented reality, Distance measurement

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Proceedings Article | 24 November 2021 Paper

Design of diffractive waveguide near eye display system with exit pupil expansion

Dongwei Ni, Dewen Cheng, Yongtian Wang

Proceedings Volume 12063, 120630A (2021) https://doi.org/10.1117/12.2606228

KEYWORDS: Waveguides, Optical design, Imaging systems, Displays, Eye

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Proceedings Article | 24 November 2021 Paper

Stray light analysis of geometric waveguide

Ximeng Wang, Deweng Cheng, Qiwei Wang, Yongtian Wang

Proceedings Volume 12063, 120630F (2021) https://doi.org/10.1117/12.2606781

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Proceedings Article | 24 November 2021 Paper

Design of ultra-short throw ratio lens using annularly stitched aspheric surface

Hailong Chen, Dewen Cheng, Yongtian Wang

Proceedings Volume 12063, 1206308 (2021) https://doi.org/10.1117/12.2606174

KEYWORDS: Distortion, Objectives, Modulation transfer functions, Aspheric lenses, Mirrors, Projection systems, Lens design, Imaging systems, Spherical lenses, Spatial frequencies

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Proceedings Article | 14 November 2021 Presentation + Paper

Optical distortion correction for an ultra-short throw with a wrinkled-surface target

Yue Liu, Dewen Cheng, Yongtian Wang

Proceedings Volume 11914, 119140Z (2021) https://doi.org/10.1117/12.2603763

KEYWORDS: Distortion, Projection systems, Ray tracing, Optical calibration, Imaging systems, Error analysis, Modulation transfer functions, Image processing, Diffraction, Reflectors

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Proceedings Article | 9 October 2021 Paper

Iterative freeform lens design for extended light source

Zexin Feng, Dewen Cheng, Yongtian Wang

Proceedings Volume 11895, 1189506 (2021) https://doi.org/10.1117/12.2601317

KEYWORDS: Freeform optics, Lens design, Ray tracing, Light emitting diodes, Computer simulations, Monte Carlo methods, Light sources, Wavefronts, Light sources and illumination

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Proceedings Article | 12 September 2021 Presentation + Paper

Optimizing freeform lenses for non-rectangular irradiance tailoring of extended LED sources

Zexin Feng, Yuyin Li, Dewen Cheng, Yongtian Wang

Proceedings Volume 11874, 118740O (2021) https://doi.org/10.1117/12.2597092

KEYWORDS: Ray tracing, Freeform optics, Light emitting diodes, Lens design, Computer simulations, 3D modeling, Optimization (mathematics), MATLAB, Monte Carlo methods, Data modeling

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Proceedings Article | 5 November 2020 Paper

Retinal projection display system based on MEMS scanning projector and conicoid curved semi-reflective mirror

Chenchen Zhang, Dewen Cheng, Junguo Lin, Yongtian Wang

Proceedings Volume 11565, 1156506 (2020) https://doi.org/10.1117/12.2579824

KEYWORDS: Microelectromechanical systems, Eye, Projection systems, Reflectivity, Field emission displays, Digital imaging, Retina, Augmented reality, Retinal scanning

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Proceedings Article | 5 November 2020 Paper

Design of an off-axis four-mirror system for automotive head-up display

Mao Zhou, Dewen Cheng, Qiwei Wang, Hailong Chen, Yongtian Wang

Proceedings Volume 11565, 1156507 (2020) https://doi.org/10.1117/12.2579841

KEYWORDS: Heads up displays, Stray light, Eye, Mirrors, Imaging systems, Distortion, Reflection, Modulation transfer functions, LCDs

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Proceedings Article | 10 October 2020 Presentation + Paper

Network training parameters exploration for generating starting points of freeform reflective imaging system design based on machine learning

Wenchen Chen, Tong Yang, Dewen Cheng, Yongtian Wang

Proceedings Volume 11548, 115480P (2020) https://doi.org/10.1117/12.2573313

KEYWORDS: Imaging systems, Reflectivity, Optical design, Optical imaging, Machine learning, Neural networks, Freeform optics, Optimization (mathematics), Network security, Distortion

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Proceedings Article | 10 October 2020 Poster + Presentation + Paper

Design of a compact and high-resolution image scanner with large depth-of-field based on compound eye system

Weixing Lei, Dewen Cheng, Tong Yang, Yue Liu, Hailong Chen, Yongtian Wang

Proceedings Volume 11548, 115481V (2020) https://doi.org/10.1117/12.2574980

KEYWORDS: Eye, Scanners, Image resolution, Modulation transfer functions, Imaging systems, Distortion

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Proceedings Article | 7 October 2020 Paper

Design of wide field of view pinhole lens for VR/AR image quality test

Ying Yuan, Dewen Cheng, Qiwei Wang, Hailong Chen, Yongtian Wang

Proceedings Volume 11571, 115710F (2020) https://doi.org/10.1117/12.2579784

KEYWORDS: Distortion, Imaging systems, Tolerancing, Lens design, Coded apertures, Virtual reality, Augmented reality, Sensors, Monochromatic aberrations

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Proceedings Article | 12 March 2020 Paper

Point-by-point design and evaluation of different system configurations consisting of freeform surfaces and/or flat phase elements

Yingzhe Duan, Tong Yang, Dewen Cheng, Yongtian Wang

Proceedings Volume 11434, 1143407 (2020) https://doi.org/10.1117/12.2540783

KEYWORDS: Imaging systems, Optical design, Optical components, Freeform optics

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Proceedings Article | 12 March 2020 Paper

Design of freeform nonsymmetric three-mirror systems using Gaussian radial basis functions freeform surfaces

Junhao Ni, Tong Yang, Dewen Cheng, Yongtian Wang

Proceedings Volume 11434, 1143408 (2020) https://doi.org/10.1117/12.2540906

KEYWORDS: Mirrors, Optical spheres, Control systems, Freeform optics, Optical design, Distortion, Modulation transfer functions, Long wavelength infrared, Wavefronts, Infrared radiation

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Proceedings Article | 5 November 2018 Paper

Optimizing double freeform surfaces for reducing deviations in ray-mapping method

Haotian Xu, Zexin Feng, Dewen Cheng, Yongtian Wang

Proceedings Volume 10815, 108151B (2018) https://doi.org/10.1117/12.2501083

KEYWORDS: Ray tracing, Freeform optics, Light emitting diodes, Geometrical optics, Lens design, Optical design, Light sources and illumination

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Proceedings Article | 5 November 2018 Paper

Freeform lens design for laser diode beam shaping

Zexin Feng, Dewen Cheng, Yongtian Wang

Proceedings Volume 10815, 108150K (2018) https://doi.org/10.1117/12.2500048

KEYWORDS: Freeform optics, Ray tracing, Lens design, Beam shaping, Wavefronts, Semiconductor lasers, Monochromatic aberrations, Collimation, Laser development

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Proceedings Article | 28 May 2018 Paper

Freeform road lighting lens design

Zexin Feng, Dewen Cheng, Yongtian Wang

Proceedings Volume 10693, 106930E (2018) https://doi.org/10.1117/12.2312452

KEYWORDS: Light sources and illumination, Roads, Freeform optics, Light emitting diodes, Ray tracing, Lens design, Monte Carlo methods, Computer simulations, Energy efficiency, Lamps

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Proceedings Article | 28 May 2018 Paper

Design of two-dimensional waveguide head-up display

Luo Gu, Dewen Cheng, Weihong Hou, Yongtian Wang

Proceedings Volume 10693, 106930G (2018) https://doi.org/10.1117/12.2312074

KEYWORDS: Waveguides, Heads up displays, Projection systems, Geometrical optics, Optical design

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Proceedings Article | 21 May 2018 Paper

Design of an immersive head mounted display with coaxial catadioptric optics

Luo Gu, Dewen Cheng, Yongtian Wang

Proceedings Volume 10676, 106761F (2018) https://doi.org/10.1117/12.2315687

KEYWORDS: Polarization, Lens design, Head-mounted displays, Polarizers, Fresnel lenses, Aspheric lenses, Distortion

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The contradiction between large field of view, big exit pupil and large eye relief in immersive virtual reality (VR) head- mounted displays limits the probability that such bulky device would be accepted by the most consumers. Typical of the wide field of view optical systems, Oculus CV1 adopts the Fresnel lens as the eyepiece to display the magnified virtual image. However, complexity in fabricating the Fresnel lens makes the commercial VR products with it cost-inefficient, especially when both surfaces employ the Fresnel surface. A wide field of view coaxial catadioptric system is proposed to serve as the magnified optics in this paper, which consists of a wire grid polarizer, two quarter-wave plates and a powered lens, making the optics thinner and fabrication easier. Note that coated on the surface of one quarter-wave plate is a partially reflecting coating. The powered lens takes the role of imaging, while the wire grid polarizer and the quarter- wave plates work together to adjust the polarization orientation so as to suppress direct transmission. The resulting monocular optical system yields the field of view as large as 110°, with virtual image exhibited 5 meters away from the observer. Exit pupil diameter and eye relief of the designed system are 9 mm and 15 mm, respectively. Considerable distortion will appear inevitably when field of view approaches 100°, which could be tackled via electronic correction. With evaluation in the CODEV, weight of the whole monocular optics is about 35 grams and the distance from the element near the observer to the image source is as thin as 30 mm, showing that the suggested design is superior to the ones in the form of singlet, doublet and the singlet using aspheric surface or Fresnel, in terms of the weight, compactness and fabricating cost. With this monocular optical system, an HMD binocular optical system can be achieved in the form of partially overlapping field of view. The present design offers a solution to acquiring the light-weight and small- volume VR optics and making cost of the commercial VR products acceptable to the public at the same time.

Proceedings Article | 21 May 2018 Paper

Design and stray light analysis of a lenslet-array-based see-through light-field near-eye display

Cheng Yao, Dewen Cheng, Yongtian Wang

Proceedings Volume 10676, 106761A (2018) https://doi.org/10.1117/12.2315667

KEYWORDS: Stray light, Stray light analysis, Spatial light modulators, Lens design, 3D displays, Augmented reality

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Proceedings Article | 31 October 2016 Paper

Optical design of a dual-channel two-focal-length system by utilizing azimuth property of PAL structure

Chen Xu, Dewen Cheng, Yongtian Wang

Proceedings Volume 10021, 100211V (2016) https://doi.org/10.1117/12.2246996

KEYWORDS: Optical design, Panoramic photography, Lens design, Zoom lenses, Imaging systems, Relays, Image sensors, Channel projecting optics, Sensors, Distortion

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Proceedings Article | 31 October 2016 Paper

Geometrical waveguide in see-through head-mounted display: a review

Qichao Hou, Qiwei Wang, Dewen Cheng, Yongtian Wang

Proceedings Volume 10021, 100210C (2016) https://doi.org/10.1117/12.2247323

KEYWORDS: Waveguides, Head-mounted displays, Freeform optics, Mirrors, Stray light, Polymethylmethacrylate, Eye, Projection systems, Refractive index, Glasses

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