Research

Research Areas

Fundamental Color Science

Color appearance model, uniform color spaces, and color difference
Chromatic adaptation
Color matching functions and metamerism
Color perception in complicated scenes (e.g., non-uniform lighting conditions, VR, AR, MR, 3D)
Reflectance reconstruction

Imaging System (Camera, display, VR/AR/MR)

Camera pipeline and ISP: white balance, color transformation matrix
Color reproduction of multi-channel cameras
Adaptive display: automatic adjustment of display brightness, white point, and content colors under different ambient lighting conditions
Display and image quality: display metamerism, HDR reproduction, contrast for better visual comfort

Illuminating Engineering

Light source color quality
Indoor and outdoor lighting quality for different applications (e.g., museum, retail, residential, roadway)
Measurement and modelling of light pollution and light nuisance
Daylighting and photo-responsive daylight control system
Light and health

Grants

2021-2022 Huawei: Color reproduction across a wide range of viewing conditions. (PI).
2022-2024 Hong Kong Research Grant Council – General Research Fund (GRF): Color Appearance of Virtual Stimuli Produced by Augmented Reality (AR) (PI). HK$ 838,393.
2021-2024 Jiangsu Science and Technology Fund Collaboration with Hong Kong, Macao, and Taiwan Scheme: Development of Prototype for Measuring Camera Sensitivity Function. (Co-PI). Share RMB 300,000 of RMB 800,000.
2021 Google Research Scholar Program. Accurate Capture of Perceived Object Colors for Smart Phone Cameras. (PI).
2021-2022 Facebook (USA). Color Pipeline of Mixed Reality, Phase 2 (PI).
2021-2023 OPPO-Zeku (China). Uniform color space (PI).
2021-2022 Prolycht Lighting (China): Learning based algorithm for self-calibrating colorimetric characteristics of computer vision camera (PI).
2020-2021 Hong Kong SAR Electrical and Mechanical Services Department (EMSD): Provision of Engineering Analysis for Outdoor Lighting System. (PI). HK$ 880,000.
2020-2021 Huawei: Smartphone display calibration. (PI)
2020-2021 DJI (China). Color management (PI).
2020-2022 Huawei: Smartphone camera ISP enhancement (PI).
2020-2021 Facebook (USA): Color Pipeline of Mixed Reality, Phase 1 (PI).
2020-2023 National Science Foundation of China (NSFC): Two-step Chromatic Adaptation Transform for Quantifying the Effects of Adapting Chromaticities, Luminance, and Medium (PI). RMB 630,000.
2020-2022 Hong Kong Research Grant Council – General Research Fund (GRF): Characterizing Light Source Color Rendition and Object Color Appearance Across a Wide Range of Light Levels (PI). HK$ 673,470.
2019-2021 Hong Kong Research Grant Council – General Research Fund (GRF): Investigation of Perception Under Off-Planckian Light Sources Used for General Illumination (PI). HK$ 632,421.
2019-2020 OPPLE Lighting (China): Investigating Optimal Luminous Environment for Different Lighting Applications (PI).
2019-2020 Hong Kong Environment Bureau and WSP: Illumination Level, Measurement Methodology Selection, and Assessment at Selected Areas in Hong Kong (PI). HK$ 240,000.
2019-2019 Harbin Institute of Technology Collaborative Research Project – Tunable LED Lighting for Low Light Levels (PI). RMB$ 125,000.
2018-2019 Hong Kong Central Policy Unit – Public Policy Research (PPR): The Possibility of Reducing Illuminance Level by Using LED Lighting Products with High CRI for Energy Reduction in Green Buildings (PI). HK$ 306,691.
2018-2020 National Science Foundation of China (NSFC): Characterization of Whiteness Appearance for Surface Colors (PI). RMB 210,000.
2018-2020 Hong Kong Innovation and Technology Commission (ITC) – Innovation and Technology Fund (ITF) Midstream Research Program for Universities: Development of Intelligent Dynamic Bright Light System at Residential Dwellings to Enhance Circadian Rhythms for People with Dementia (Co-PI). HK$ 2,269,000.
2017/18 Hong Kong Research Grant Council – Hong Kong PhD Fellowship Scheme (PI).
2017-2019 Hong Kong Research Grant Council – General Research Fund/Early Career Scheme (GRF/ECS): Development of A Metric for Characterizing Light Source Whiteness Rendition for Architectural Lighting (PI). HK$ 618,470.
2016-2017 WSP: Evaluation of Light Nuisance in Causeway Bay Hong Kong (PI).

2021-2024 PolyU Photonics Research Institute (Co-PI). HK$ 30,000,000.
2019/2020 Hong Kong PolyU Large Equipment Fund for Teaching: Full-field Glare Test System (PI). HK$ 1,000,000.
2020-2021 Hong Kong PolyU Joint Supervision Scheme with the Chinese Mainland, Taiwan, and Macao Universities: Quantitative Study and Modeling of the Effect of Time-Light Modulation on Photobiological Effects. (PI). HK$ 180,600.
2018-2019 Hong Kong PolyU Research Grant: Perception of White Point of Displays Under Off-Planckian Sources (PI). HK$ 105,000.
2017-2018 Hong Kong PolyU Joint Supervision Scheme with the Chinese Mainland, Taiwan, and Macao Universities: Effects of Ambient Illumination Condition on Visual Comfort for Using Tablet Devices (PI). HK$ 194,000.
2016-2017 Hong Kong PolyU Joint Supervision Scheme with the Chinese Mainland, Taiwan, and Macao Universities: The Effect of LED Lighting on Memory Colors (PI). HK$ 168,000.
2016-2019 Hong Kong PolyU Research Grant: The Integration of Spectral-Tunable LED Lighting and Daylighting for Energy Efficient Buildings (PI). HK$ 500,000.
2016-2019 Hong Kong PolyU Research Grant: Unique Hues for Surface Colors under Various Lighting Conditions (PI). HK$ 500,000.
2015-2016 Hong Kong PolyU Research Grant: Quantifying the Luminous Environment of Modern Offices for Luminous Screen Tasks (PI). HK$ 105,000.
2016-2019 Hong Kong PolyU Departmental Learning & Teaching Development Grant: Development of A Multi-Channel LED Lighting System for Lighting Education (PI). HK$ 52,000.
2016-2019 Hong Kong PolyU Departmental Learning & Teaching Development Grant: Development of a learning package for students to appreciate the high performance building development (Co-I). HK$ 116,000.