Alex Chapiro

I am a Senior Researcher at Dolby Laboratories, where I work on human perception and display technologies. I previously worked at Disney Research in Zurich, advised by Aljoscha Smolic.

I did my PhD at ETH Zurich, where I was advised by Markus Gross at the Computer Graphics Laboratory. I did my masters at IMPA in the Visgraf lab and my bachelors at the Federal University of Juiz de Fora.

Email  /  CV  /  Biography  /  Thesis  /  Google Scholar  /  LinkedIn

Research

I am interested in image and video processing, computational capture and display, stereo 3D, HDR, applied perception and virtual reality. Most of my research deals with creating and then displaying high quality content on novel displays.

CVMP2015

Unfolding the 8-bit Era
Zund, Berard, Chapiro, Schmid, Ryffel, Bermano, Gross, Sumner.
European Conference on Visual Media Production (CVMP) , 2015
project page / bibtex

We created an immersive gaming system out of a legacy console.

This work received wide media attention and was presented at the Ludicious game festival in Zurich.

CGnA2015

Art-Directable/Continuous Dynamic Range Video
Chapiro, Aydin, Stefanoski, Croci, Smolic, Gross.
Computers and Graphics (CG&A) , 2015
project page / bibtex

We defined the production and distribution challenges facing the content creation industry in the current HDR landscape and proposed Continuous Dynamic Range video as a solution.

CGnA2015

Video Content and Structure Description Based on Keyframes, Clusters and Storyboards
Junyent, Beltran, Farre, Pont-Tuset, Chapiro, Smolic.
Computers and Graphics (CG&A) , 2015
video / bibtex

We developed a pipeline to segment and analyze video. Our technique could be applied for smarter editing.

CGnA2015

Stereo from Shading
Chapiro, O'Sullivan, Jarosz, Gross, Smolic.
Eurographics Symposium on Rendering (EGSR) , 2015
project page / bibtex / supplementary

We use non-photorealistic shading as an alternative 3D cue, augmenting the feeling of depth in stereoscopic images.

CGnA2015

Perceptual Evaluation of Cardboarding in 3D Content Visualization
Chapiro, O'Sullivan, Jarosz, Gross, Smolic.
ACM Symposium on Applied Perception (SAP), 2014
project page / bibtex

We conducted perceptual experiments to quantify cardboarding - an artifact that occurs when not enough depth is given to a stereoscopic 3D image region.

CGnA2015

Optimizing Stereo-to-Multiview Conversion for Autostereoscopic Displays
Chapiro, Heinzle, Aydin, Poulakos, Zwicker, Smolic, Gross.
Eurographics, 2014
project page / bibtex

We measured perceptual aspects of autostereo content and created a depth re-mapping algorithm that tries to optimize content so that the most important regions have a fuller sense of depth while staying within the limits of the technology.

Cas11

Towards Mobile HDR Video
Castro, Chapiro, Cicconet, Velho.
extended abstract in Eurographics, 2011
video

We created a capture and processing pipeline to generate HDR video on a mobile phone by taking sequential multiple exposures.

Cas11

Detection of High Frequency Regions in Multiresolution
Mota, Perez, Castro, Chapiro, Vieira.
International Conference on Image Processing (ICIP), 2009

We improved our edge detector by using eigenvalues.

Cas9

High Frequency Assessment from Multiresolution Analysis
Castro, Perez, Mota, Chapiro, Vieira, Freire.
International Conference on Computational Science (ICCS), 2009

We detected high frequencies using an orientation tensor and multiresolution.

Posters:

Hub15

The Influence of Visual Salience on Video Consumption Behavior A Survival Analysis Approach
Huber, Scheibehenne, Chapiro, Frey, Sumner.
ACM Web Science, 2015
long paper version

We found that visual saliency can be used as a predictor for video watching behavior in online platforms.

Cha11

Filter Based Deghosting for Exposure Fusion Video
Chapiro, Cicconet, Velho.
SIGGRAPH, 2011
video

We used an aditional per-pixel parameter to avoid ghosting from motion when generating exposure-fusion videos on a mobile phone. (Student research competition semi-finalist)

Cas11b

Towards Mobile HDR Video
Castro, Chapiro, Cicconet, Velho.
International Conference on Computational Photography (ICCP), 2011
video

We created a capture and processing pipeline to generate HDR video on a mobile phone by taking sequential multiple exposures.

Additional publications available upon request.

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