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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 has up to 6 dB higher coding...

Publication details
Date: 1 September 2016
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Dong Liu, Lizhi Wang, Li Li, Zhiwei Xiong, Feng Wu, and Wenjun Zeng
Publication details
Date: 1 July 2016
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
Meghana Marathe, Jacki O’Neill, Paromita Pain, and William Thies

Helping citizens to resolve grievances is an important part of many e-governance initiatives. In this paper, we examine two contemporary initiatives that use ICTs to help citizens resolve grievances in central India. One system is a state-run call center (the CM Helpline), while the other is an independent citizen journalism service (CGNet Swara). Despite similarities in their high-level goals, approach, and geographies served, the systems have key differences in their use of technology, their level of...

Publication details
Date: 3 June 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Jacki O’Neill, Kentaro Toyama, Jay Chen, Berthel Tate, and Aysha Siddique

During the first decade of the 21 st century, the rise of mobile feature phones in India saw the development of both an economy of informal media exchange and a culture of active media sharing for entertainment. Mobile phone owners paid for pirated movies and music on the grey market, and they traded them with one another, even using poorly designed mechanisms such as Bluetooth file exchange.

In this paper, we update what is known about the dynamic mobile media sharing culture through qualitative...

Publication details
Date: 3 June 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Syed Ishtiaque Ahmed, Nicola J Bidwell, Himanshu Zade, Srihari H Muralidhar, Anupama Dhareshwar, Baneen Karachiwala, Tandong Neba Cedrick, and Jacki O’Neill

This paper contributes to the growing literature on peer-to-peer (P2P) applications through an ethnographic study of auto-rickshaw drivers in Bengaluru, India. We describe how the adoption of a P2P application, Ola, which connects passengers to rickshaws, changes drivers work practices. Ola is part of the ‘peer services’ phenomenon which enable new types of ad-hoc trade in labour, skills and goods. Auto-rickshaw drivers present an interesting case because prior to Ola few had used Smartphones or the...

Publication details
Date: 7 May 2016
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
Sean Rintel, Richard Harper, and Kenton 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
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
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, Roman Rädle, and sean rintel

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
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 April 2016
Type: Article
Publisher: Elsevier
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 April 2016
Type: Article
Publisher: IEEE – Institute of Electrical and Electronics Engineers
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
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
Publication details
Date: 1 February 2016
Type: Article
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
Carman Neustaedter, Gina Venolia, Jason Procyk, and Daniel Hawkins

Attending and presenting at conferences is a core part of academic and industrial research. Yet it can sometimes be challenging to attend conferences due to travel restrictions, time limitations, or accessibility challenges. To understand how people may be able to attend conferences remotely, we explored the use of commercial telepresence robots called Beams at Ubicomp/ISWC 2014. Seven people attended the conference remotely and used Beams to attend presentations, ask questions, and participate in break...

Publication details
Date: 1 February 2016
Type: Inproceeding
Publisher: ACM
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
David Martin, Jacki O’Neill, Neha Gupta, and Benjamin V. Hanrahan

This paper examines how working in the global labour market of Amazon Mechanical Turk (AMT) impacts upon and is understood by two different groups of workers. To do this we report on two qualitative studies; one of US and another of Indian crowdworkers (or ‘Turkers ’) that we analysed from an ethnomethodological orientation. Our data is naturalistic and comes from a variety of sources – interviews, observations and forum posts – where Turkers describe their work, and their understandings of that work...

Publication details
Date: 13 January 2016
Type: Article
Publisher: Springer
Nick Greer, Jaime Teevan, and Shamsi Iqbal

This paper provides a brief introduction to opportunities that exist for providing better technological support for writing. Developing the appropriate technology that adequately supports the complex processes of writing is difficult because writing requires fundamental but varied skills such as reading, analysis, reasoning, and communication. For this reason, we believe that writing tools designed to support these skills can provide a valuable lens by which to understand and explore interesting...

Publication details
Date: 1 January 2016
Type: Technical report
Publisher: Microsoft Research
Number: MSR-TR-2016-1
Cuiling Lan, Dongliang He, Chong Luo, Feng Wu, and Wenjun Zeng

Mobile video live streaming is facing great challenges in offering high quality of experience (QoE) under varying channel conditions. In this paper, we propose a progressive pseudo-analog transmission scheme in which the received video quality gracefully adapts to both SNR and bandwidth variations. Building upon the emerging pseudo-analog video transmission, the proposed scheme further adopts a greedy approach to improve the received video quality with each allocated bandwidth share. The optimal...

Publication details
Date: 1 December 2015
Type: Inproceeding
Publisher: IEEE – Institute of Electrical and Electronics Engineers
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
Dongliang He, Chong Luo, Feng Wu, and Wenjun Zeng

Efficient and robust wireless stereo video delivery is an enabling technology for various mobile 3D applications. Existing digital solutions have high source coding efficiency but are not robust to channel variations, while analog solutions have the opposite characteristics. In this paper, we design a novel hybrid digital-analog (HDA) solution to embrace the advantages of both solutions and avoid their drawbacks. Basically, in each pair of stereo frames, one frame is digitally encoded to ensure basic...

Publication details
Date: 1 November 2015
Type: Inproceeding
Publisher: ACM – Association for Computing Machinery
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
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