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Algorithms and theory47205 (238)
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Seungwon Kim, Sasa Junuzovic, and Kori Inkpen

Mobile videoconferencing is increasingly being used to bring remote friends or family along to an activity happening outside the home, such as shopping or visiting a tourist attraction. We explored how including contextual information of the event, in addition to audio and video of the person at the event, impacts the shared experience. We studied three kinds of information: a map showing the position of the person at the activity, a second live video showing what was in front of that person, and a...

Publication details
Date: 1 November 2014
Type: Inproceeding
Publisher: ACM
Azadeh Forghani, Gina Venolia, and Kori Inkpen
Publication details
Date: 1 November 2014
Type: Inproceeding
Publisher: ACM
Cha Zhang, Dinei Florencio, and Charles Loop

Compressing attributes on 3D point clouds such as colors or normal directions has been a challenging problem, since these attribute signals are unstructured. In this paper, we propose to compress such attributes with graph transform. We construct graphs on small neighborhoods of the point cloud by connecting nearby points, and treat the attributes as signals over the graph. The graph transform, which is equivalent to Kahunen-Loeve Transform on such graphs, is then adopted to decorrelate the signal....

Publication details
Date: 1 October 2014
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Pengfei Wan, Gene Cheung, Dinei Florencio, Cha Zhang, and Oscar Au

While modern displays offer high dynamic range (HDR) with large bit-depth for each rendered pixel, the bulk of legacy image and video contents were captured using cameras with shallower bit-depth. In this paper, we study the bit-depth enhancement problem for images, so that a high bit-depth (HBD) image can be reconstructed from an input low bit-depth (LBD) image. The key idea is to apply appropriate smoothing given the constraints that reconstructed signal must lie within the per-pixel quantization...

Publication details
Date: 1 October 2014
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Seth Hunter, Pattie Maes, Anthony Tang, Kori Inkpen, and Sue Hessey

We present the design, and evaluation of WaaZam, a video mediated communication system designed to support creative play in customized environments. Users can interact together in virtual environments composed of digital assets layered in 3D space. The goal of the project is to support creative play and increase social engagement during video sessions of geographically separated families. We try to understand the value of customization for individual families with children ages 6-12. We present...

Publication details
Date: 1 April 2014
Type: Inproceeding
Publisher: ACM Conference on Human Factors in Computing Systems: CHI2014
J.-B. Huang, Q. Cai, Z. Liu, N. Ahuja, and Z. Zhang

Cross-ratio (CR) based methods offer many attractive properties for remote gaze estimation using a single camera in an uncalibrated setup by exploiting invariance of a plane projectivity. Unfortunately, due to several simplification assumptions, the performance of CR-based eye gaze trackers decays significantly as the subject moves away from the calibration position. In this paper, we introduce an adaptive homography mapping for achieving gaze prediction with higher accuracy at the calibration position...

Publication details
Date: 1 March 2014
Type: Inproceeding
Publisher: ACM
Z. Zhang and Q. Cai

The cross-ratio approach has recently attracted increasing attention in eye-gaze tracking due to its simplicity in setting up a tracking system. Its accuracy, however, is lower than that of the model-based approach, and substantial efforts have been devoted to improving its accuracy. Binocular fixation is essential for humans to have good depth perception, and this paper presents a technique leveraging this constraint. It is used in two ways: First, in estimating jointly the homography matrices for both...

Publication details
Date: 1 March 2014
Type: Inproceeding
Publisher: ACM
Huanhuan Xia, Tun Lu, Bin Shao, Guo Li, Xianghua Ding, and Ning Gu
Publication details
Date: 1 February 2014
Type: Inproceeding
Gina Venolia, Tom Erickson, John Tang, Ben Mazza, and Susan C. Herring

This panel brings together HCI researchers who are primarily remote workers, in order to discuss their technological solutions and social practices. We aim for an engaging, fun, and informative discussion appropriate for researchers interested in remote collaboration and computer-mediated communication.

Publication details
Date: 1 February 2014
Type: Inproceeding
Publisher: ACM Conference on Computer Supported Cooperative Work
Robert Douglas Ferguson, Michael Massimi, Emily Anne Crist, and Karyn Anne Moffatt

Hospice is a medical setting for patients with terminal illnesses where active treatment is withdrawn in favor of providing comfort and dignity at the end of life. Providing comfort extends beyond managing physical pain to include social, emotional, spiritual, and environmental aspects of care. We studied technology's role in achieving these multifaceted dimensions of comfort through interviews with 16 family members of past hospice patients. Comfort was an ongoing pursuit, requiring the involvement of...

Publication details
Date: 1 January 2014
Type: Inproceeding
Publisher: ACM
Elena Agapie and Andres Monroy-Hernandez

We present Eventful, a system for producing news reports of local events using remote and locative crowd workers. The system recruits and guides novice crowd workers as they perform the roles of field reporter, curator, or writer. Field reporters attend the events in person, and use Eventful's mobile web app to get a personalized mission, submit content, and receive feedback. Missions include tasks such as taking a photo, and asking a question to an attendee. In parallel, remote curators approve,...

Publication details
Date: 1 January 2014
Type: Proceedings
Publisher: Collective Intelligence Conference
Michael Massimi and Carman Neustaedter

Video chat programs for home and personal use (e.g., Skype) are becoming increasingly popular for doing more than simply conversing with a remote friend or family member. This creates a need to understand the broader use of video chat that moves “beyond talking heads.” In this paper, we investigate one emergent scenario: major life events where video chat is used to connect remote participants to a ritual gathering (e.g., a wedding, a funeral). To explore this scenario, we conducted an online survey...

Publication details
Date: 1 January 2014
Type: Inproceeding
Publisher: ACM
Niranjan Pai, Pradnya Supe, Shailesh Kore, Y.S. Nandanwar, Aparna Hegde, Edward Cutrell, and William Thies

For years, researchers have explored the use of mobile phone reminders to improve adherence to medication. However, few studies have measured the direct medical benefit of those reminders, especially for low-literate populations in the developing world. This paper describes the use of automated voice calls to promote adherence to iron supplements among pregnant women in urban India. Unlike prior studies, we assess impact via a direct measurement of hemoglobin (Hb) levels in the blood. We enrolled 130...

Publication details
Date: 1 December 2013
Type: Inproceeding
Publisher: ACM
John C. Tang, Jed R. Brubaker, and Catherine C. Marshall

End users have begun to incorporate cloud-based services into their collaborative practices. What spurs and constrains this adoption? Are the cloud services understood adequately and used effectively? How might we intervene to promote a better connection between user practices and cloud services? In this study, we focus on collaborative practices that surround the adoption, use, and understanding of two popular, but sometimes contrasting, cloud services for creating and sharing content: Dropbox and...

Publication details
Date: 2 September 2013
Type: Inproceeding
Publisher: Springer
Anna Macaranas, Gina Venolia, Kori Inkpen, and John Tang

While video communication is becoming quite popular among remote friends and family, recent usage practices have been extending beyond just talking heads to remotely sharing an experience by doing an activity together. However, current video chat tools are aimed at sharing talking heads and need to be reconsidered to support remotely sharing activities. We explore a specific remote shared activity – watching video programs – through a three-phase study. We surveyed people’s interest in watching video...

Publication details
Date: 1 September 2013
Type: Inproceeding
Publisher: Springer
john c tang, henry chen, angela chin, alex hehmeyer, John suciu, jim palmer, and eran shtiegman

Sharing awareness information to help remote people establish real-time communication has been a research area for the past couple decades. Much of the work so far has focused on sharing awareness for communication availability in the work setting. Yet several recent trends suggest the need to reconsider the contexts and assumptions around awareness research. Increasing deployment of communication technology in homes and the blurring of home and work boundaries means that more communication interactions...

Publication details
Date: 1 May 2013
Type: Inproceeding
Publisher: IEEE
Benjamin Mako Hill and Andres Monroy-Hernandez

In this article we argue that there is a trade-off between generativity and originality in online communities that support open collaboration. We build on foundational theoretical work in peer production to formulate and test a series of hypotheses suggesting that the generativity of creative works is associated with moderate complexity, prominent authors, and cumulativeness. We also formulate and test three hypotheses that these qualities are associated with decreased originality in resulting...

Publication details
Date: 1 May 2013
Type: Article
Publisher: American Behavioral Scientist
Akansel Cosgun, Dinei A. Florencio, and Henrik I. Christensen

We present a method for a mobile robot to follow a person autonomously where there is an interaction between the robot and human during following. The planner takes into account the predicted trajectory of the human and searches future trajectories of the robot for the path with the highest utility. Contrary to traditional motion planning, instead of determining goal points close to the person, we introduce a task dependent goal function which provides a map of desirable areas for the robot to be at,...

Publication details
Date: 1 May 2013
Type: Inproceeding
Publisher: IEEE
Catherine C. Marshall and Frank M. Shipman

The growth of online videos has spurred a concomitant increase in the storage, reuse, and remix of this content. As we gain more experience with video content, social norms about ownership have evolved accordingly, spelling out what people think is appropriate use of content that is not necessarily their own. We use a series of three studies, each centering on a different genre of recordings, to probe 634 participants’ attitudes toward video storage, reuse, and remix; we also question participants about...

Publication details
Date: 1 May 2013
Type: Inproceeding
Publisher: ACM
Yuheng Hu, Shelly Farnham, and Andres Monroy-Hernandez

Social media systems promise powerful opportunities for people to connect to timely, relevant information at the hyper local level. Yet, finding the meaningful signal in noisy social media streams can be quite daunting to users. In this paper, we present and evaluate Whoo.ly, a web service that provides neighborhood-specific information based on Twitter posts that were automatically inferred to be hyperlocal. Whoo.ly automatically extracts and summarizes hyperlocal information about events, topics,...

Publication details
Date: 29 April 2013
Type: Inproceeding
Publisher: ACM Sig CHI 2013
Sarah Hallacher, Jenny Rodenhouse, and Andres Monroy-Hernandez

In this paper, we introduce the concept of mixsourcing as a modality of crowdsourcing focused on using remixing as a framework to get people to perform creative tasks. We implement this idea through two design exercises that helped us identify the promises and challenges of this peer-production modality.

Publication details
Date: 29 April 2013
Type: Inproceeding
Publisher: ACM Conference on Human Factors in Computing Systems
John C. Tang, Robert Xiao, Aaron Hoff, Gina Venolia, Patrick Therien, and Asta Roseway

HomeProxy is a research prototype that explores supporting video communication in the home among distributed family members through a physical proxy. It leverages a physical artifact dedicated to representing remote family members to make it easier to share activities with them. HomeProxy combines a form factor designed for the home environment with a “no-touch” user experience and an interface that responsively transitions between recorded and live video messages. We designed and implemented a...

Publication details
Date: 1 April 2013
Type: Inproceeding
Publisher: ACM Conference on Human Computer Interaction Paris, 2013
Peyina Lin and Shelly D. Farnham

With the increasing use of the Internet and social media for knowledge and social connections, we might expect that people more easily expand their opportunities for new learning through social relationships online. Yet, this mixed methods study of teens’ use of technologies (e.g. YouTube and social media) in informal learning contexts reveals that, in teens’ preferred learning activities, few interact with new ties outside their immediate networks (school, family, and friends). Given the value of...

Publication details
Date: 23 February 2013
Type: Inproceeding
Publisher: ACM Conference on Computer Supported Cooperative Work
Ivan Tashev and Malcolm Slaney

Audio signal enhancement often involves the application of a time-varying filter, or suppression rule, to the frequency-domain transform of a corrupted signal. Classic approaches use rules derived under Gaussian models and interpret them as spectral estimators in a Bayesian statistical framework. This mathematical approach provides rules that satisfy certain optimization criteria – maximum likelihood, mean square error, etc. In this paper we propose to learn the suppression rule from a representative...

Publication details
Date: 14 February 2013
Type: Inproceeding
Publisher: University of California - San Diego
Jiang Yang, Scott Counts, Meredith Ringel Morris, and Aaron Hoff

Microblogs have become an increasingly important source of information, both in the U.S. (Twitter) and in China (Weibo). However, the brevity of microblog updates, combined with increasing access of microblog content through search rather than through direct network connections, makes it challenging to assess the credibility of news relayed in this manner. This paper reports on experimental and survey data that compare the impact of several features of microblog updates (author’s gender, name style,...

Publication details
Date: 1 February 2013
Type: Inproceeding
Publisher: ACM Conference on Computer Supported Cooperative Work
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