Papers by Guillaume THIBAULT
ABSTRACT: This paper presents a general strategy for 3D reconstruction of complex architectural s... more ABSTRACT: This paper presents a general strategy for 3D reconstruction of complex architectural scenes. This approach,makes,use of both laser
The display of space filling data is still a challenge for the community of visualization. Direct... more The display of space filling data is still a challenge for the community of visualization. Direct Volume Rendering (DVR) is one of the most important techniques developed to achieve direct perception of such volumetric data. It is based on semi-transparent representations, where the data are accumulated in a depth-dependent order. However, it produces images that may be difficult to understand, and thus several techniques have been proposed so as to improve its effectiveness, using for instance lighting models or simpler representations (e.g. Maximum Intensity Projection). In this paper we present two perceptual studies that question how DVR meets its goals, in either static or dynamic context. We show that a static representation is highly ambiguous, even in simple cases, but this can be counterbalanced by use of dynamic cues, i.e. motion parallax, provided that the rendering parameters are correctly tuned.
Computer Vision and Image Understanding, 2011
We present a new method for solving the problem of camera pose and calibration from a limited num... more We present a new method for solving the problem of camera pose and calibration from a limited number of correspondences between noisy 2D and 3D features. We show that the probabilistic estimation problem can be expressed as a partially linear problem, where point and line correspondences are mixed using a common formulation. Our Sampling-Solving algorithm enables to robustly estimate the
... where N is our basic noise function, x the spatial coordinates, f0 the fundamental frequency ... more ... where N is our basic noise function, x the spatial coordinates, f0 the fundamental frequency ... Human contrast sensitivity function measurements show a maxi-mum around 4 to 5 cycles per ... for more complex stimuli like binary noise or natural images [Watson and Ahumada 2005]. ...
ACM Transactions on Applied Perception, 2009
The display of space filling data is still a challenge for the community of visualization. Direct... more The display of space filling data is still a challenge for the community of visualization. Direct Volume Rendering (DVR) is one of the most important techniques developed to achieve direct perception of such volumetric data. It is based on semi-transparent representations, where the data are accumulated in a depth-dependent order. However, it produces images that may be difficult to understand, and thus several techniques have been proposed so as to improve its effectiveness, using for instance lighting models or simpler representations (e.g. Maximum Intensity Projection). In this paper we present two perceptual studies that question how DVR meets its goals, in either static or dynamic context. We show that a static representation is highly ambiguous, even in simple cases, but this can be counterbalanced by use of dynamic cues, i.e. motion parallax, provided that the rendering parameters are correctly tuned.
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Papers by Guillaume THIBAULT