Shape-Time Photography

William T. Freeman and Hao Zhang

EECS Department, University of California, Berkeley

Technical Report No. UCB/CSD-02-1171

2002

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http://www2.eecs.berkeley.edu/Pubs/TechRpts/2002/Archive/CSD-02-1171.pdf

We introduce a new method to describe, in a single image, changes in shape over time. We acquire both range and image information with a stationary stereo camera. From the pictures taken, we display a composite image consisting of the image data from the surface closest to the camera at every pixel. This reveals the 3-d relationships over time by easy-to-interpret occlusion relationships in the composite image. We call the composite a shape-time photograph.

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p>Small errors in depth measurements cause artifacts in the shape-time images. We correct most of these using a Markov network to estimate the most probable front surface, taking into account the depth measurements, their uncertainties, and layer continuity assumptions.

BibTeX citation:

@techreport{Freeman:CSD-02-1171,
    Author= {Freeman, William T. and Zhang, Hao},
    Title= {Shape-Time Photography},
    Year= {2002},
    Month= {Jan},
    Url= {http://www2.eecs.berkeley.edu/Pubs/TechRpts/2002/5657.html},
    Number= {UCB/CSD-02-1171},
    Abstract= {We introduce a new method to describe, in a single image, changes in shape over time. We acquire both range and image information with a stationary stereo camera. From the pictures taken, we display a composite image consisting of the image data from the surface closest to the camera at every pixel. This reveals the 3-d relationships over time by easy-to-interpret occlusion relationships in the composite image. We call the composite a shape-time photograph. <p>Small errors in depth measurements cause artifacts in the shape-time images. We correct most of these using a Markov network to estimate the most probable front surface, taking into account the depth measurements, their uncertainties, and layer continuity assumptions.},
}

EndNote citation:

%0 Report
%A Freeman, William T. 
%A Zhang, Hao 
%T Shape-Time Photography
%I EECS Department, University of California, Berkeley
%D 2002
%@ UCB/CSD-02-1171
%U http://www2.eecs.berkeley.edu/Pubs/TechRpts/2002/5657.html
%F Freeman:CSD-02-1171