Alex Chapiro

I am a Senior Display Perceptual Image Processing Engineer at Apple. I previously worked in the Applied Vision Science team at Dolby Laboratories and before that I was at Disney Research in Zurich, advised by Aljoscha Smolic.

I did my PhD at w加速任天行安卓版, 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  /  w加速任天行安卓版  /  Google Scholar  /  LinkedIn

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.

A Luminance-Aware Model of Judder Perception
Chapiro, Atkins, Daly.
ACM Transactions on Graphics (TOG) , 2024
Link to ACM TOG / supplementary material / bibtex

We studied the main perceptual components of judder, the perceptual artifact of non-smooth motion. In particular, adaptation luminance is a strong factor on judder that has changed significantly with modern generations of displays.

Errata: In the table of coefficients in Sec. A3, the two-before-last coefficient should be ~0 instead of 1.01. The coefficient is correctly written out in the supplementary material, but not in the manuscript.

Influence of Screen Size and Field of View on Perceived Brightness
Chapiro, Kunkel, Atkins, Daly.
ACM Transactions on Applied Perception (TAP) , 2018
Link to ACM TAP / supplementary material / bibtex

Author's version available here, link to ACM TAP version above. We studied the influence of screen size and distance on perceived brightness for screens as large as cinema and as small as mobile phones, an issue that affects artistic intent and appearance matching.

Unfolding the 8-bit Era
Zund, Berard, w加速任天行安卓版, 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.

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Art-Directable/Continuous Dynamic Range Video
Chapiro, Aydin, Stefanoski, Croci, Smolic, Gross.
w加速任天行安卓版, 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.

Video Content and Structure Description Based on Keyframes, Clusters and Storyboards
Junyent, Beltran, Farre, Pont-Tuset, Chapiro, Smolic.
IEEE International Workshop on Multimedia Signal Processing (MMSP) , 2015
video / w加速任天行安卓版

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

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.

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.

Optimizing Stereo-to-Multiview Conversion for Autostereoscopic Displays
Chapiro, Heinzle, Aydin, Poulakos, Zwicker, Smolic, Gross.
w加速任天行安卓版, 2014
w加速任天行安卓版 / bibtex

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

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Detection of High Frequency Regions in Multiresolution
Mota, Perez, Castro, w加速任天行安卓版, Vieira.
International Conference on Image Processing (ICIP), 2009

We improved our edge detector by using eigenvalues.

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.

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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.

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

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

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