Chi-Jui Wu 吳啟瑞

I am a technologist/data scientist by day and a humanist/writer by night. I work on digital transformation (natural language processing and human-AI collaoboration) during the day. I think, read, and write about technology and human life stories including life challenges, mental health, and positivity in one place and another. I am particularly interested in human-centered computing, humanistic psychology, and education. My academic background is in computer science and machine learning. I have done Human-Computer Interaction (HCI) research at St Andrews (undergraduate), UCL (masters), and Lancaster (PhD) in the UK; my research experience includes cross-device interaction, proxemic interaction, and accessibility. I have also spent one year as an English teaching assistant in Hualien, Taiwan.

I am writing on Medium!


Life Updates

2019 / 05 / 04  Published paper Cross-Device Taxonomy in CHI'19.
2019 / 01 / 02  Started data scientist position at Taishin International Bank, Taiwan.
2018 / 08 / 31  Withdrawal from PhD study.
2018 / 01 / 15  Started PhD with fellowship at Interactive Systems, Lancaster University, UK.
2018 / 01 / 05  Finished military substitute (education) service in Hualien, Taiwan.
2017 / 05 / 19  Started publishing on Medium, with blog My Journey to CHI 2017.
2017 / 05 / 06  Published paper EagleSense in CHI'17.
2016 / 12 / 02  Published paper Out of Sight in PUC.
2016 / 11 / 01  Received MRes from University College London, UK (Distinction).
2015 / 06 / 24  Received BSc from University of St Andrews, UK (First-Class Honours).


"It becomes easier for me to accept myself as a decidedly imperfect person, who by no means functions at all times in the way in which I would like to function. This must seem to some like a very strange direction in which to move. It seems to me to have value because the curious paradox is that when I accept myself just as I am, then I change."

Carl Rogers in On Becoming a Person
  life stories and self-actualization
clarity 2019 / 06 / 26  clarity
gratitude-journal 2019 / 05 / 19  Gratitude Journal
listening-to-the-world 2019 / 03 / 03  Listening to the world
英專替代役感想 2017 / 12 / 21  英專替代役感想
my-journal-to-chi-2017 2017 / 05 / 19  My Journal to CHI 2017
  positivity, well-being, and psychology
suffering-and-growth 2019 / 07 / 20  suffering and growth
animal-behaviour 2019 / 03 / 03  Animal Behaviour
coffee 2019 / 01 / 16  一杯咖啡
self-actualizing-and-humanistic-technology 2018 / 11 / 28  自我實現與人文科技


2019. Ching Su and Chi-Jui Wu. Weaving Human Experiences: Life Challenges in People with Visual Impairments. Unpublished manuscript.

Life Sensitive Frame

A growing interest within HCI is in understanding how people with visual impairments' disability emerges from interactions in situated, sociotechnical contexts. However, much of this work focuses on the accessibility experience in specific moments. In contrast, a person's whole life experience and life challenges have received little attention. We seek to weave the threads of accessibility research on diverse human experiences by exploring how technology, society, and culture jointly influence a person's growth throughout their lives. Human life is always changing, and our values and identity are reflected in our life stories. Through life story interviews with ten participants in Taiwan, we discuss three life challenges to personal growth in people with visual impairments and how technologies mediate the development of these life challenges. Finally, we introduce the life sensitive frame to support people with visual impairments as they grow and tackle their life challenges.

2019. Frederik Brudy, Christian Holz, Roman Rädle, Chi-Jui Wu, Steven Houben, Clemens Klokmose, and Nicolai Marquardt. Cross-Device Taxonomy: Survey, Opportunities and Challenges of Interactions Spanning Across Multiple Devices. In Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems (CHI'19).


Cross-Device Taxonomy

Designing interfaces or applications that move beyond the bounds of a single device screen enables new ways to engage with digital content. Research addressing the opportunities and challenges of interactions with multiple devices in concert is of continued focus in HCI research. To inform the future research agenda of this field, we contribute an analysis and taxonomy of a corpus of 510 papers in the cross-device computing domain. For both new and experienced researchers in the field we provide: an overview, historic trends and unified terminology of cross-device research; discussion of major and under-explored application areas; mapping of enabling technologies; synthesis of key interaction techniques spanning across multiple devices; and review of common evaluation strategies. We close with a discussion of open issues. Our taxonomy aims to create a unified terminology and common understanding for researchers in order to facilitate and stimulate future cross-device research.

2017. Chi-Jui Wu, Steven Houben, and Nicolai Marquardt. EagleSense: Tracking People and Devices in Interactive Spaces using Real-Time Top-View Depth-Sensing. In Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems (CHI'17).



Real-time tracking of people's location, orientation and activities is increasingly important for designing novel ubiquitous computing applications. Top-view camera-based tracking avoids occlusion when tracking people while collaborating, but often requires complex tracking systems and advanced computer vision algorithms. To facilitate the prototyping of ubiquitous computing applications for interactive spaces, we developed EagleSense, a real-time human posture and activity recognition system with a single top-view depth-sensing camera. We contribute our novel algorithm and processing pipeline, including details for calculating silhouette-extremities features and applying gradient tree boosting classifiers for activity recognition optimized for top-view depth sensing. EagleSense provides easy access to the real-time tracking data and includes tools for facilitating the integration into custom applications. We report the results of a technical evaluation with 12 participants and demonstrate the capabilities of EagleSense with application case studies.

2017. Chi-Jui Wu, Aaron Quigley, and David Harris-Birtill. Out of Sight: A Toolkit for Tracking Occluded Human Joint Positions. In Personal and Ubiquitous Computing (PUC).


Out of Sight

Real-time identification and tracking of the joint positions of people can be achieved with off-the-shelf sensing technologies such as the Microsoft Kinect, or other camera-based systems with computer vision. However, tracking is constrained by the system’s field of view of people. When a person is occluded from the camera view, their position can no longer be followed. Out of Sight addresses the occlusion problem in depth-sensing tracking systems. Our new tracking infrastructure provides human skeleton joint positions during occlusion, by combining the field of view of multiple Kinects using geometric calibration and affine transformation. We verified the technique’s accuracy through a system evaluation consisting of 20 participants in stationary position and in motion, with two Kinects positioned parallel, 45°, and 90° apart. Results show that our skeleton matching is accurate to within 16.1 cm (s.d. = 5.8 cm), which is within a person’s personal space. In a realistic scenario study, groups of two people quickly occlude each other, and occlusion is resolved for 85% of the participants. A RESTful API was developed to allow distributed access of occlusion-free skeleton joint positions. As a further contribution, we provide the system as open source.

Chi-Jui Wu 吳啟瑞 | Last Updated: 2019/07/01