Search Results

Now showing 1 - 10 of 20
  • Item
    Virtual Architecture in the Free Space
    (The Eurographics Association, 2012) Clini, Paolo; Quattrini, Ramona; Nespeca, Romina; Andrea Fusiello and Michael Wimmer
    The multi-projection image techniques offer interesting possibilities for architecture communication and augmented reality. This poster shows experimental solutions for pseudo-holographic projection 360 degree so-called "holographic bell", and projection screen. The more intense research regarding the technical and technological possibilities and the materials of the semi-reflecting plates is being carried out in the EARCOM laboratory of DICEA of Univpm in Ancona. The main goal is to design a good container, ensuring that the content is predominant: low-cost bells, with the maximum projection surface and minimizing the structure.
  • Item
    Multiview-Consistent Color Sampling for Alpha Matting
    (The Eurographics Association, 2012) Kettern, Markus; Eisert, Peter; Andrea Fusiello and Michael Wimmer
    We propose a method for incorporating multiview information into color sampling methodologies for alpha matting. We extend the typical trimap input for matting algorithms to 3D space, enabling the association of stripes of pixels in semi-transparent regions like hair between different views without knowing or inferring their spatial structure. We also formulate a new cost function penalizing deviations of foreground color estimates between associated pixel stripes and its possible integration into a state-of-the-art color sampling approach.
  • Item
    Meshless Statistical Occlusion Computation
    (The Eurographics Association, 2012) Fouquet, François; Farrugia, Jean-Philippe; Iehl, Jean-Claude; Dupuy, Jonathan; Andrea Fusiello and Michael Wimmer
    This paper presents a new method to evaluate visibility from a point cloud by using a meshless statistical representation. The resulting evaluation uses much less memory than previous work while still producing high quality images, making it suitable for memory limited systems. The obtained results are exposed through the evaluation of shadow maps using a point cloud created from range images and are compared to current methods, which rely on mesh reconstruction techniques.
  • Item
    Exploration of 3D Spectroscopy Data
    (The Eurographics Association, 2012) Romo, Celia; Torres, Juan Carlos; León, Alejandro J.; Andrea Fusiello and Michael Wimmer
    Integral field spectroscopy (IFS) is a technique that is widely used by astrophysics. It allows the whole electromagnetic spectrum for each pixel of a telescope image to be captured, generating a large amount of information. Visualizing and exploring this information in a flexible and an intuitive way is a challenge. This paper presents an interactive method to explore IFS data.
  • Item
    Combining Structure from Motion and Photometric Stereo: A Piecewise Formulation
    (The Eurographics Association, 2012) Sabzevari, Reza; Bue, Alessio Del; Murino, Vittorio; Andrea Fusiello and Michael Wimmer
    This paper introduces a novel piecewise formulation for Photometric Stereo on static scenes exploiting a set of multiple view constraints on the surface. Such constraints will help to recover geometrical properties of the object and to eliminate the global bas-relief ambiguity. On the other hand, the proposed piecewise formulation will help to model more complex photometric properties of the surfaces using local lighting models. The experimental results show performance of the proposed method against 3D ground truth.
  • Item
    Combining Texture Streaming and Run-Time Generation
    (The Eurographics Association, 2012) Demeulemeester, Aljosha; Hollemeersch, Charles-Frederik; Pieters, Bart; Lambert, Peter; Walle, Rik Van de; Andrea Fusiello and Michael Wimmer
    Virtual texturing systems have enabled gigapixel resolutions for textures used in real-time rendering. This allows for more detail and diversity in virtual worlds at the cost of greatly increasing disc storage requirements. In this paper, we propose a compression method that generates parts of these large textures at run-time using the original painting primitives (brushes) from the texture production process. This way, large featureless texture areas can be compressed to a few brush resources. A post-production analyzing phase determines those areas that should be stored as compressed texel data to ensure real-time performance at run-time.
  • Item
    Minimising Longest Edge for Closed Surface Construction from Unorganised 3D Point Sets
    (The Eurographics Association, 2012) Ohrhallinger, Stefan; Mudur, Sudhir; Andrea Fusiello and Michael Wimmer
    Given an unorganised 3D point set with just coordinate data, we formulate the problem of closed surface construction as one requiring minimisation of longest edge in triangles, a criterion derivable from Gestalt laws for shape perception. Next we define the Minimum Boundary Complex (BCmin), which resembles the desired surface Bmin considerably, by slightly relaxing the topological constraint to make it at least two triangles per edge instead of exactly two required by Bmin. A close approximation of BCmin can be computed fast using a greedy algorithm. This provides a very good starting shape which can be transformed by a few steps into the desired shape, close to Bmin. Our method runs in O(nlogn) time, with Delaunay Graph construction as largest run-time factor. We show considerable improvement over previous methods, especially for sparse, non-uniform point spacing.
  • Item
    Efficient Point Based Global Illumination on GPU
    (The Eurographics Association, 2012) Wang, Beibei; Xu, Zhen; Xu, Yanning; Meng, Xiangxu; Andrea Fusiello and Michael Wimmer
    Point based rendering can simulate global illumination phenomenon fast and is widely used in movie production. This paper proposes a point based color bleeding algorithm based on GPU efficiently. In our algorithm, we reorder the shading points according to the similarity of them to use the coherency of the GPU memory. Then, we propose a novel idea named chunking to accelerate the point cloud traversal process by using the constant memory of GPU.
  • Item
    On User-Interaction in 3D Reconstruction
    (The Eurographics Association, 2012) Schneider, David C.; Eisert, Peter; Andrea Fusiello and Michael Wimmer
    For many computer graphics tasks such as segmentation, tracking or retargeting, algorithms are designed to allow user interaction. For real-world applications, tools which give users some form of control are often preferred over fully automatic ones. In 3D reconstruction, however, algorithms are typically non-interactive and errors are corrected after reconstruction in generic 3D modeling software. In this contribution, we discuss fundamental algorithmic considerations regarding interactivity in 3D reconstruction and we outline an optimization-based reconstruction framework which allows the incorporation of interactive tools as energy terms.
  • Item
    Automatic Alignment of Shape Collections
    (The Eurographics Association, 2012) Averkiou, Melinos; Mitra, Niloy; Andrea Fusiello and Michael Wimmer
    We present a method for automatically aligning a collection of similar shapes in arbitrary initial poses. By analyzing the shape collection we extract a deformation model to capture the variability in the collection. We use this information to deform an extracted template shape and use it to align pairs of shapes by direct PCA alignment. We evaluate our method on synthetically created model collections in arbitrary initial poses and demonstrate accurate results with near ground truth alignment. Our algorithm significantly outperforms existing direct PCA alignment methods, without significant computational overhead.