Dr. Kaiwei Wang Profile

Dr. Kaiwei Wang

Associate Professor at Zhejiang Univ

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Author

Publications (37)

SPIE Journal Paper | 1 March 2022

High-performance panoramic annular lens design for real-time semantic segmentation on aerial imagery

Jia Wang, Kailun Yang, Shaohua Gao, Lei Sun, Chengxi Zhu, Kaiwei Wang, Jian Bai

OE, Vol. 61, Issue 03, 035101, (March 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.3.035101

KEYWORDS: Image segmentation, Panoramic photography, Imaging systems, Lens design, Tolerancing, Image quality, Optical engineering, Image resolution, Distortion, Optical design

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Proceedings Article | 18 December 2019 Paper

Design of high resolution panoramic annular lens system

Jia Wang, Xiao Huang, Jian Bai, KaiWei Wang, Yongxiao Hua

Proceedings Volume 11338, 113382I (2019) https://doi.org/10.1117/12.2547629

KEYWORDS: Distortion, Imaging systems, Optical design, Panoramic photography, Image sensors, Modulation transfer functions, Image quality, Image resolution, Sensors

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Proceedings Article | 23 October 2019 Presentation + Paper

A depth estimation framework based on unsupervised learning and cross-modal translation

Jiafeng Shen, Kaiwei Wang, Kailun Yang, Kaite Xiang, Lei Fei, Xinxin Hu, Huabing Li, Hao Chen

Proceedings Volume 11158, 1115807 (2019) https://doi.org/10.1117/12.2532666

KEYWORDS: RGB color model, Near infrared, Image restoration, Image analysis, Convolution, Network architectures, Machine learning, Image processing, Image quality, Image enhancement

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Proceedings Article | 17 October 2019 Presentation + Paper

Visual place recognition based on multilevel descriptors for the visually impaired people

Yicheng Fang, Kaiwei Wang, Ruiqi Cheng, Kailun Yang, Jian Bai

Proceedings Volume 11158, 1115808 (2019) https://doi.org/10.1117/12.2532524

KEYWORDS: Databases, Visualization, Feature extraction, Image processing, Detection and tracking algorithms, Image segmentation, Image enhancement, Sensors, Image sensors, Image transmission

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Proceedings Article | 19 September 2019 Presentation + Paper

See clearer at night: towards robust nighttime semantic segmentation through day-night image conversion

Lei Sun, Kaiwei Wang, Kailun Yang, Kaite Xiang

Proceedings Volume 11169, 111690A (2019) https://doi.org/10.1117/12.2532477

KEYWORDS: Image segmentation, Gallium nitride, Data modeling, Cameras, Roads, Performance modeling, Sensors, Navigation systems, Visible radiation, Visual process modeling

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In recent years, intelligent driving navigation and security monitoring have made considerable progress with the help of deep Convolutional Neural Networks (CNNs). As one of the state-of-the-art perception approaches, semantic segmentation unifies distinct detection tasks widely desired by both autonomous driving and security monitoring. Currently, semantic segmentation shows remarkable efficiency and reliability in standard scenarios such as daytime scenes with favorable illumination conditions. However, in face of adverse conditions such as the nighttime, semantic segmentation loses its accuracy significantly. One of the main causes of the problem is the lack of sufficient annotated segmentation datasets of nighttime scenes. In this paper, we propose a framework to alleviate the accuracy decline when semantic segmentation is taken to adverse conditions by using Generative Adversarial Networks (GANs). To bridge the daytime and nighttime image domains, we made key observation that compared to datasets in adverse conditions, there are considerable amount of segmentation datasets in standard conditions such as BDD and our collected ZJU datasets. Our GAN-based nighttime semantic segmentation framework includes two methods. In the first method, GANs were used to translate nighttime images to the daytime, thus semantic segmentation can be performed using robust models already trained on daytime datasets. In another method, we use GANs to translate different ratio of daytime images in the dataset to the nighttime but still with their labels. In this sense, synthetic nighttime segmentation datasets can be generated to yield models prepared to operate at nighttime conditions robustly. In our experiment, the later method significantly boosts the performance at the nighttime evidenced by quantitative results using Intersection over Union (IoU) and Pixel Accuracy (Acc). We show that the performance varies with respect to the proportion of synthetic nighttime images in the dataset, where the sweet spot corresponds to most robust performance across the day and night. The proposed framework not only makes contribution to the optimization of visual perception in intelligent vehicles, but also can be applied to diverse navigational assistance systems.

Proceedings Article | 19 September 2019 Presentation + Paper

A comparative study of high-recall real-time semantic segmentation based on swift factorized network

Kaite Xiang, Kaiwei Wang, Kailun Yang

Proceedings Volume 11169, 111690C (2019) https://doi.org/10.1117/12.2532697

KEYWORDS: Convolution, Image segmentation, Computer programming, Roads, Unmanned vehicles, Navigation systems, Visualization, Performance modeling, Convolutional neural networks, Neural networks

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Proceedings Article | 19 September 2019 Presentation + Paper

Semantic segmentation of panoramic images using a synthetic dataset

Yuanyou Xu, Kaiwei Wang, Kailun Yang, Dongming Sun, Jia Fu

Proceedings Volume 11169, 111690B (2019) https://doi.org/10.1117/12.2532494

KEYWORDS: Image segmentation, Panoramic photography, Distortion, Neural networks, Artificial intelligence, Machine learning

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Proceedings Article | 19 September 2019 Paper

Semantic scene understanding on mobile device with illumination invariance for the visually impaired

Chengyou Xu, Kaiwei Wang, Kailun Yang, Ruiqi Cheng, Jian Bai

Proceedings Volume 11169, 111690Q (2019) https://doi.org/10.1117/12.2532550

KEYWORDS: Image segmentation, Mobile devices, Computer programming, Visualization, Convolution, Network architectures

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Proceedings Article | 2 July 2019 Open Access

Optics education for multidisciplinary students: how to focus on the relationship between optical technology and human civilization in group discussion

Xiaotong Li, Qing Yang, Ke Si, Kaiwei Wang

Proceedings Volume 11143, 1114324 (2019) https://doi.org/10.1117/12.2523858

KEYWORDS: Optics education, Interdisciplinary fields, Scientific research, Engineering education, Education and training

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SPIE Journal Paper | 7 February 2019

Assisting the visually impaired: multitarget warning through millimeter wave radar and RGB-depth sensors

Ningbo Long, Kaiwei Wang, Ruiqi Cheng, Kailun Yang, Weijian Hu, Jian Bai

JEI, Vol. 28, Issue 01, 013028, (February 2019) https://doi.org/10.1117/12.10.1117/1.JEI.28.1.013028

KEYWORDS: Radar, Sensors, Extremely high frequency, Data fusion, Image fusion, Sensor fusion, Filtering (signal processing), Visualization, Radar sensor technology, Detection and tracking algorithms

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Proceedings Article | 9 October 2018 Presentation + Paper

Glass detection and recognition based on the fusion of ultrasonic sensor and RGB-D sensor for the visually impaired

Zhiming Huang, Kaiwei Wang, Kailun Yang, Ruiqi Cheng, Jian Bai

Proceedings Volume 10794, 107940F (2018) https://doi.org/10.1117/12.2325496

KEYWORDS: Glasses, Sensors, Ultrasonics, Mirrors, Sensor fusion, Calibration

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Proceedings Article | 9 October 2018 Presentation + Paper

Scene text detection and recognition system for visually impaired people in real world

Lei Fei, Kaiwei Wang, Shufei Lin, Kailun Yang, Ruiqi Cheng, Hao Chen

Proceedings Volume 10794, 107940S (2018) https://doi.org/10.1117/12.2325523

KEYWORDS: Visualization, Neural networks, Detection and tracking algorithms, Optical character recognition, Network architectures, Object recognition, Navigation systems, Roads, Sensors, Image segmentation

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Proceedings Article | 5 October 2018 Presentation + Paper

Fusion of millimeter wave radar and RGB-depth sensors for assisted navigation of the visually impaired

Ningbo Long, Kaiwei Wang, Ruiqi Cheng, Kailun Yang, Jian Bai

Proceedings Volume 10800, 1080006 (2018) https://doi.org/10.1117/12.2324626

KEYWORDS: Radar, Sensors, Sensor fusion, Radar sensor technology, Cameras, Data fusion

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Proceedings Article | 4 October 2018 Paper

SORB: improve ORB feature matching by semantic segmentation

Hao Chen, Kaiwei Wang, Weijian Hu, Lei Fei

Proceedings Volume 10799, 107990Z (2018) https://doi.org/10.1117/12.2325423

KEYWORDS: Image segmentation, Visualization, Sensors, Detection and tracking algorithms, Feature extraction, RGB color model, Binary data, Data modeling, Image resolution, Machine vision

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Proceedings Article | 4 October 2018 Presentation + Paper

A robust localization approach using multi-sensor fusion

Weijian Hu, Kaiwei Wang, Hao Chen

Proceedings Volume 10799, 107990U (2018) https://doi.org/10.1117/12.2325521

KEYWORDS: Global Positioning System, Cameras, Particle filters, Unmanned aerial vehicles, Data fusion

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SPIE Journal Paper | 27 October 2017

Crosswalk navigation for people with visual impairments on a wearable device

Ruiqi Cheng, Kaiwei Wang, Kailun Yang, Ningbo Long, Weijian Hu, Hao Chen, Jian Bai, Dong Liu

JEI, Vol. 26, Issue 05, 053025, (October 2017) https://doi.org/10.1117/12.10.1117/1.JEI.26.5.053025

KEYWORDS: Detection and tracking algorithms, Visualization, Neural networks, Algorithm development, Binary data, Neurons, Roads, Cameras, Evolutionary algorithms, Image segmentation

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Proceedings Article | 16 August 2017 Open Access

Evolution of National University Students' Optical-Science-Technology competition in China

Xu Liu, XiangDong Liu, XiaoPing Wang, XiaoDong Zheng, YuanFang Lin, Kaiwei Wang

Proceedings Volume 10452, 104522R (2017) https://doi.org/10.1117/12.2269748

KEYWORDS: Optoelectronics, Photonics, Electrical engineering, Optics education, Optical communications

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Proceedings Article | 16 August 2017 Open Access

Applied Electronics and Optical Laboratory: an optimized practical course for comprehensive training on optics and electronics

Kaiwei Wang, Xiaoping Wang

Proceedings Volume 10452, 104522V (2017) https://doi.org/10.1117/12.2269927

KEYWORDS: Optoelectronics, Semiconductor lasers, Sensors, Optics, Light sources, Testing and analysis

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Proceedings Article | 16 August 2017 Open Access

Curriculum optimization of College of Optical Science and Engineering

Xiaoping Wang, Zhenrong Zheng, Kaiwei Wang, Xiaodong Zheng, Song Ye, Yuhui Zhu

Proceedings Volume 10452, 104522J (2017) https://doi.org/10.1117/12.2269879

KEYWORDS: Optoelectronics, Optics, Optical engineering

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Proceedings Article | 16 August 2017 Open Access

Light-based science and technologies and human civilization: an optical course for general education

Xiaotong Li, Kaiwei Wang, Qing Yang, Ke Si

Proceedings Volume 10452, 104521K (2017) https://doi.org/10.1117/12.2266843

KEYWORDS: Optical engineering, Optics education, Education and training, Engineering education, Light

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Proceedings Article | 8 February 2017 Paper

Unconstrained face detection and recognition based on RGB-D camera for the visually impaired

Xiangdong Zhao, Kaiwei Wang, Kailun Yang, Weijian Hu

Proceedings Volume 10225, 1022509 (2017) https://doi.org/10.1117/12.2266122

KEYWORDS: Facial recognition systems, Cameras, Visualization, Neural networks, 3D modeling, Principal component analysis, Detection and tracking algorithms, 3D image processing, Image processing, Video

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Proceedings Article | 31 October 2016 Paper

Detection of atmospheric boundary layer height in the plum rain season over Hangzhou area with three-dimensional scanning polarized lidar

Peijun Tang, Dong Liu, Peituo Xu, Yudi Zhou, Jian Bai, Chong Liu, Kaiwei Wang, Yongying Yang, Yibing Shen, Jing Luo, Zhongtao Cheng, Yupeng Zhang, Yanyang Liu

Proceedings Volume 10019, 100190F (2016) https://doi.org/10.1117/12.2245274

KEYWORDS: LIDAR, Atmospheric sensing, Wavelets, 3D scanning, Aerosols, Atmospheric particles, Meteorology, Telescopes, Signal to noise ratio, Control systems

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Proceedings Article | 25 October 2016 Paper

Analysis and amelioration about the cross-sensitivity of a high resolution MOEMS accelerometer based on diffraction grating

Qianbo Lu, Jian Bai, Kaiwei Wang, Shuqi Lou, Xufen Jiao, Dandan Han

Proceedings Volume 9685, 968504 (2016) https://doi.org/10.1117/12.2241339

KEYWORDS: Microopto electromechanical systems, Diffraction gratings, Sensors, Mechanical sensors, Diffraction, Structural sensing, Finite element methods, Silicon, Semiconducting wafers, Etching

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Proceedings Article | 28 August 2016 Presentation + Paper

Mechanical design optimization of a single-axis MOEMS accelerometer based on a grating interferometry cavity for ultrahigh sensitivity

Qianbo Lu, Jian Bai, Kaiwei Wang, Shuqi Lou, Xufen Jiao, Dandan Han, Guoguang Yang

Proceedings Volume 9960, 99600W (2016) https://doi.org/10.1117/12.2235409

KEYWORDS: Microopto electromechanical systems, Interferometry, Mechanical engineering, Mechanical sensors, Optical design, Finite element methods, Mechanical engineering, Mirrors, Silicon, 3D modeling, Lanthanum

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Proceedings Article | 13 May 2016 Paper

High-spectral-resolution lidar for ocean ecosystem studies

Dong Liu, Yudi Zhou, Yongying Yang, Zhongtao Cheng, Jing Luo, Yupeng Zhang, Yibing Shen, Kaiwei Wang, Chong Liu, Jian Bai

Proceedings Volume 9832, 983214 (2016) https://doi.org/10.1117/12.2224488

KEYWORDS: LIDAR, Remote sensing, Scattering, Laser scattering, Ecosystems, Ocean optics, Mie scattering, Water, Molecules, Backscatter

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Proceedings Article | 8 October 2015 Paper

Detection of micro-sized air bubble defects in optical glass based on Mie theory

Sai Zhang, Jian Bai, Kaiwei Wang, Fan He, Bin Zhou

Proceedings Volume 9677, 96770R (2015) https://doi.org/10.1117/12.2199047

KEYWORDS: Mie scattering, Light scattering, Scattering, Glasses, Laser scattering, Particles, Optical testing, CCD cameras, Defect detection, Gaussian beams

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Proceedings Article | 20 August 2015 Presentation + Paper

Tolerance analysis of the pulse signal of a novel lateral deformable optical NEMS grating transducer

Chen Wang, Jian Bai, Kaiwei Wang

Proceedings Volume 9556, 95560G (2015) https://doi.org/10.1117/12.2186555

KEYWORDS: Tolerancing, Signal attenuation, Diffraction gratings, Transducers, Finite-difference time-domain method, Reflectivity, Nanoelectromechanical systems, Sensors, Microelectromechanical systems

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Proceedings Article | 7 August 2015 Paper

Detection of defects in optics based on scanning

Bin Zhou, Jian Bai, Yiyong Liang, Kaiwei Wang, Qianbo Lu, Sai Zhang

Proceedings Volume 9623, 96231F (2015) https://doi.org/10.1117/12.2193745

KEYWORDS: Glasses, Microscopes, Defect detection, Optical components, CCD cameras, Error analysis, 3D image processing, Image processing, Laser optics, Light scattering

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Proceedings Article | 18 September 2014 Paper

Calibration method for angular measurement of moiré patterns

Fan He, Jian Bai, Kaiwei Wang, Xiyun Hou, Jiang Yao

Proceedings Volume 9282, 92821B (2014) https://doi.org/10.1117/12.2070535

KEYWORDS: Calibration, Statistical analysis, Collimation, Helium neon lasers, CCD cameras, Ronchi rulings, Astatine, Signal analyzers, Spatial frequencies, Interferometry

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Proceedings Article | 18 September 2014 Paper

Calibration for the errors resulted from aberration in long focal length measurement

Jiang Yao, Jia Luo, Fan He, Jian Bai, Kaiwei Wang, Xiyun Hou, Changlun Hou

Proceedings Volume 9282, 92821S (2014) https://doi.org/10.1117/12.2069978

KEYWORDS: Calibration, Error analysis, Interferometry, Zemax, Visualization, Numerical analysis, C++, Holograms, Confocal microscopy, Optical testing

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Proceedings Article | 21 August 2014 Paper

Broadband optical concentration technology based on grating side-coupling

Luyun Lu, Kaiwei Wang

Proceedings Volume 9283, 92830W (2014) https://doi.org/10.1117/12.2069982

KEYWORDS: Diffraction gratings, Waveguides, Finite-difference time-domain method, Solar energy, Visible radiation, Optical design, Diffraction, Absorption, Glasses, Solar concentrators

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Proceedings Article | 15 October 2012 Paper

Two-dimensional structural surface measurement based on spectrally resolved white-light interferometry

Wantao Deng, Kaiwei Wang, Jinchun Zhang

Proceedings Volume 8417, 84170F (2012) https://doi.org/10.1117/12.964378

KEYWORDS: Frequency combs, Interferometry, Fabry–Perot interferometers, Linear filtering, Phase shifting, Superposition, Interferometers, Light, Fourier transforms, Distance measurement

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Proceedings Article | 15 October 2012 Paper

Influence of alignment error and random noise on interferometry flat sub-aperture stitching

Wantao Deng, Kaiwei Wang, Jinchun Zhang

Proceedings Volume 8417, 841715 (2012) https://doi.org/10.1117/12.966324

KEYWORDS: Error analysis, Zemax, Optical testing, Interferometry, Optical alignment, Algorithm development, Sensors, Photovoltaics, Optical simulations, Interferometers

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Proceedings Article | 9 November 2010 Paper

Novel algorithm for compensating misalignment in optical spherical surface testing

Jinchun Zhang, Kaiwei Wang, Jian Bai

Proceedings Volume 7849, 78492L (2010) https://doi.org/10.1117/12.870436

KEYWORDS: Optical spheres, Spherical lenses, Optical testing, Interferometers, Fizeau interferometers, Lens design, Optical instrument design, Wavefronts, Optical design, Current controlled current source

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Proceedings Article | 9 November 2010 Paper

White light interferometry for fast areal surface measurement based on GPGPU

Jing Wang, Kaiwei Wang, Shuangshuang Zhao, Li Lin, Jian Bai

Proceedings Volume 7849, 784918 (2010) https://doi.org/10.1117/12.870336

KEYWORDS: Interferometry, Optical interferometry, Graphics processing units, Data processing, Tunable lasers, Optical testing, Interferometers, Visualization, Beam splitters, Signal detection

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Proceedings Article | 9 November 2010 Paper

Single-shot white-light dispersive interferometric profilometer

Pei Zhu, Kaiwei Wang, Shuangshuang Zhao

Proceedings Volume 7849, 78491A (2010) https://doi.org/10.1117/12.869987

KEYWORDS: Interferometry, Fabry–Perot interferometers, Profilometers, Interferometers, CCD cameras, Light, Light sources, Phase shifting, Profiling, Phase shifts

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Proceedings Article | 11 October 2010 Paper

Performance comparison of optical path difference calculation algorithms for wavelength scanning interferometry

Kai Wang, CaoYan Long

Proceedings Volume 7656, 76560V (2010) https://doi.org/10.1117/12.867761

KEYWORDS: Fourier transforms, Phase shifting, Interferometry, Phase measurement, Light sources, Interferometers, Phase shifts, Sensors, Interference (communication), Optical amplifiers

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Showing 5 of 37 publications

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