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Dorina Thanou, Philip A. Chou, and Pascal Frossard

This paper addresses the problem of compression of 3D point cloud sequences that are characterized by moving 3D positions and color attributes. As temporally successive point cloud frames share some similarities, motion estimation is key to effective compression of these sequences. It however remains a challenging problem as the point cloud frames have varying numbers of points without explicit correspondence information. We represent the time-varying geometry of these sequences with a set of graphs,...

Publication details
Date: 1 December 2016
Type: Article
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Ricardo L. de Queiroz and Philip A. Chou

In free-viewpoint video, there is a recent trend to represent scene objects as solids rather than using multiple depth maps. Point clouds have been used in computer graphics for a long time and with the recent possibility of real time capturing and rendering, point clouds have been favored over meshes in order to save computation. Each point in the cloud is associated with its 3D position and its color. We devise a method to compress the colors in point clouds which is based on a hierarchical transform...

Publication details
Date: 1 December 2016
Type: Article
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Philip A. Chou and Ricardo L. de Queiroz

We introduce the Gaussian Process Transform (GPT), an orthogonal transform for signals defined on a finite but otherwise arbitrary set of points in a Euclidean domain. The GPT is obtained as the e Transform (KLT) of the marginalization of a Gaussian Process defined on the domain. Compared to the Graph Transform (GT), which is the KLT of a Gauss Markov Random Field over the same set of points whose neighborhood structure is inherited from the Euclidean domain, the GPT retains up to 6 dB higher energy in...

Publication details
Date: 1 September 2016
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Robin Brewer, Meredith Ringel Morris, and Anne Marie Piper

Diversifying participation in crowd work can benefit the worker and requester. Increasing numbers of older adults are online, but little is known about their awareness of or how they engage in mainstream crowd work. Through an online survey with 505 seniors, we found that most have never heard of crowd work but would be motivated to complete tasks by earning money or working on interesting or stimulating tasks. We follow up results from the survey with interviews and observations of 14 older adults...

Publication details
Date: 1 May 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Jaime Teevan, Shamsi T. Iqbal, and Curtis von Veh

This paper presents the MicroWriter, a system that decomposes the task of writing into three types of microtasks to produce a single report: 1) generating ideas, 2) labeling ideas to organize them, and 3) writing paragraphs given a few related ideas. Because each microtask can be completed individually with limited awareness of what has been already done and what others are doing, this decomposition can change the experience of collaborative writing. Prior work has used microtasking to support...

Publication details
Date: 1 May 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Sean Rintel, Richard Harper, and K enton O’Hara

This paper reports on how asynchronous mobile video messaging presents users with a challenge to doing ‘being ordinary’. 53 participants from three countries were recruited to try Skype Qik at launch for two weeks. Some participants embraced Skype Qik as a gift economy, emphasizing a special relationship enacted through crafted self-presentation. However, gift exchange makes up only a small proportion of conversation. Many participants struggled with the self-presentation obligations of video when...

Publication details
Date: 1 May 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Debaleena Chattopadhyay, Kenton O'Hara, Sean Rintel, and Roman Rädle

Slide presentations have long been stuck in a one-to-many paradigm, limiting audience engagement. Based on the concept of smartphone-based remote control of slide navigation, we present Office Social—a PowerPoint plugin and companion smartphone app that allows audience members qualified access to slides for personal review and, when the presenter enables it, public control over slide navigation. We studied the longitudinal use of Office Social across four meetings of a workgroup. We found that...

Publication details
Date: 1 May 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Debaleena Chattopadhyay, Kenton O'Hara, Sean Rintel, and Roman Rädle

Slide presentations have long been stuck in a one-to-many paradigm, limiting audience engagement. Based on the concept of smartphone-based remote control of slide navigation, we present Office Social—a PowerPoint plugin and companion smartphone app that allows audience members qualified access to slides for personal review and, when the presenter enables it, public control over slide navigation. We studied the longitudinal use of Office Social across four meetings of a workgroup. We found that...

Publication details
Date: 1 May 2016
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
Debaleena Chattopadhyay, Kenton O'Hara, Sean Rintel, and Roman Rädle

Slide presentations have long been stuck in a one-to-many paradigm, limiting audience engagement. Based on the concept of smartphone-based remote control of slide navigation, we present Office Social—a PowerPoint plugin and companion smartphone app that allows audience members qualified access to slides for personal review and, when the presenter enables it, public control over slide navigation. We studied the longitudinal use of Office Social across four meetings of a workgroup. We found that...

Publication details
Date: 1 May 2016
Type: Proceedings
Publisher: ACM – Association for Computing Machinery
Aamir Anis, Philip A. Chou, and Antonio Ortega

The advent of advanced acquisition techniques in 3D media applications has led to an increasing trend of capturing dynamic objects and scenes via 3D point cloud sequences. This form of data is composed of time-indexed frames, each consisting of a collection of points with position and color attributes. Compression of such datasets is challenging because of the lack of efficient techniques for exploiting spatial and temporal correlations between the attributes. In our approach, we create an intermediate...

Publication details
Date: 1 March 2016
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Lilian de Greef, Meredith Ringel Morris, and Kori Inkpen Quinn

People can have experiences through video calls that are otherwise inaccessible. For example, someone who cannot leave the home may wish to experience visiting the zoo. We present TeleTourist, a system that uses video calls with strangers to share experiences for people with mobility restrictions. We designed TeleTourist to enhance immersion and personalization, as well as help balance the relationship between participants of the video calls. We discuss features we have implemented or envisioned for...

Publication details
Date: 1 February 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Mary L. Gray, Siddharth Suri, Syed Shoaib Ali, and Deepti Kulkarni

The main goal of this paper is to show that crowdworkers collaborate to fulfill technical and social needs left by the platform they work on. That is, crowdworkers are not the independent, autonomous workers they are often assumed to be, but instead work within a social network of other crowdworkers. Crowdworkers collaborate with members of their networks to 1) manage the administrative overhead associated with crowdwork, 2) find lucrative tasks and reputable employers and 3) recreate the social...

Publication details
Date: 1 February 2016
Type: Article
Saiph Savage, Andres Monroy-Hernandez, and Tobias Hollerer

To help activists call new volunteers to action, we present Botivist: a platform that uses Twitter bots to find potential volunteers and request contributions. By leveraging different Twitter accounts, Botivist employs different strategies to encourage participation. We explore how people respond to bots calling them to action using a test case about corruption in Latin America. Our results show that the majority of volunteers (> 80%) who responded to Botivist’s calls to action contributed relevant...

Publication details
Date: 1 February 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Publication details
Date: 1 February 2016
Type: Article
Publication details
Date: 1 February 2016
Type: Article
Sean Rintel, Daniel Angus, and Richard Fitzgerald

During the 2011 UK public sector protests, controversy ignited over the “Miliband Loop”, an unedited video from a pool interview showing Labour leader Ed Miliband to have provided largely the same answer in response to six questions. The interviewer subsequently complained in a TwitLonger that the incident epitomized the clash of public relations and journalism. In this paper we unpack the practical production of the pool interview as a delamination of the interview-as-lived from the...

Publication details
Date: 17 November 2015
Type: Article
Publisher: Elsevier
Zhiding Yu and Cha Zhang

We report our image based static facial expression recognition method for the Emotion Recognition in the Wild Challenge (EmotiW) 2015. We focus on the sub-challenge of the SFEW 2.0 dataset, where one seeks to automatically classify a set of static images into 7 basic emotions. The proposed method contains a face detection module based on the ensemble of three state-of-the-art face detectors, followed by a classification module with the ensemble of multiple deep convolutional neural networks (CNN). Each...

Publication details
Date: 9 November 2015
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Dorina Thanou, Philip A. Chou, and Pascal Frossard

This paper addresses the problem of motion estimation in 3D point cloud sequences that are characterized by moving 3D positions and color attributes. Motion estimation is key to effective compression of these sequences, but it remains a challenging problem as the temporally successive frames have varying sizes without explicit correspondence information. We represent the time-varying geometry of these sequences with a set of graphs, and consider 3D positions and color attributes of the points clouds as...

Publication details
Date: 1 September 2015
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Yung-Ju Chang and John C. Tang

Smartphones are considered to be “always on, always connected” but mobile users are not always attentive and responsive to incoming communication. We present a mixed methods study investigating how mobile users use ringer modes for managing interruption by and awareness of incoming communication, and how these practices and locales affect their attentiveness and responsiveness. We show that mobile users have diverse ringer mode usage, but they switch ringer modes mainly for three purposes: avoiding...

Publication details
Date: 25 August 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Gina Venolia, John C. Tang, and Kori Inkpen

We developed a prototype called SeeSaw that explored using reaction video and auto reply to create an engaging video messaging experience. When viewing a video message, reaction video captures a video of the viewer’s reaction to share back with the message sender. After finishing viewing the video message, auto reply immediately begins recording the viewer’s response. A pilot study found that SeeSaw evoked conversational and authentic interactions, even though the messages were...

Publication details
Date: 24 August 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Hanif Baharin, Stephen Viller, and Sean Rintel

SonicAIR is an ambient awareness technology probe designed to explore how connecting the soundscapes of friends or family members might reduce the isolation of seniors living independently. At its core, SonicAIR instruments kitchen activity sites to produce an always-on real-time aural representation of remote domestic rhythms. This paper reports how users in two pilot SonicAIR deployments used the sounds as resources for recognizing comfortable narratives of sociability. Used alongside telecare...

Publication details
Date: 1 July 2015
Type: Article
Publisher: ACM – Association for Computing Machinery
Helen J. Wang, Alexander Moshchuk, Michael Gamon, Mona Haraty, Shamsi Iqbal, Eli T. Brown, Ashish Kapoor, Chris Meek, Eric Chen, Yuan Tian, Jaime Teevan, Mary Czerwinski, and Susan Dumais

In this paper, we advocate “activity” to be a central abstraction between people and computing instead of applications. We outline the vision of the activity platform as the next-generation social platform.

Publication details
Date: 8 May 2015
Type: Technical report
Publisher: Microsoft Research
Number: MSR-TR-2015-38
Chien-Ju Jo, Siddharth Suri, Aleksandrs Slivkins, and Jennifer Wortman Vaughan

We study the causal effects of financial incentives on the quality of crowdwork. We focus on performance-based payments (PBPs), bonus payments awarded to workers for producing high quality work. We design and run randomized behavioral experiments on the popular crowdsourcing platform Amazon Mechanical Turk with the goal of understanding when, where, and why PBPs help, identifying properties of the payment, payment structure, and the task itself that make them most effective. We provide examples of tasks...

Publication details
Date: 1 May 2015
Type: Article
Aditya Vashistha, Edward Cutrell, Gaetano Borriello, and William Thies

Interactive voice forums have emerged as a promising platform for people in developing regions to record and share audio messages using low-end mobile phones. However, one of the barriers to the scalability of voice forums is the process of screening and categorizing content, often done by a dedicated team of moderators. We present Sangeet Swara, a voice forum for songs and cultural content that relies on the community of callers to curate high-quality posts that are prioritized for playback to others....

Publication details
Date: 1 May 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Awards: Best of CHI Award
Irene Rae, Bilge Mutlu, Gary M. Olson, Judith S. Olson, Leila Takayama, and Gina Venolia

As network availability becomes ubiquitous, users are leveraging this access to establish their presence in remote locations through the use of commercially available telepresence technologies. With the increasing adoption of systems, new questions are emerging about how these technologies affect user interactions and relationships. Our goal for this workshop is to bring an interdisciplinary group of telepresence researchers together to trade perspectives, fostering new opportunities for collaboration...

Publication details
Date: 18 April 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
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