| Wavelet-Domain Reconstruction of Lost Blocks in Wireless Image Transmission and Packet-Switched Networks |
28 SEP 2005 |
5 pages |
| Authors:
Shantanu D. Rane; Jeremiah Remus; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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 | A fast scheme for wavelet-domain interpolation of lost image blocks in wireless image transmission is presented in this paper. The algorithm is designed to be compatible with the wavelet-based JPEG2000 image compression standard. In the transmission of block-coded images, fading in wireless channels and congestion in packet-switched networks can cause entire blocks to be lost. Instead of using common retransmission query protocols, we reconstruct the lost block in the wavelet-domain ... |
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| Image Inpainting |
28 SEP 2005 |
12 pages |
| Authors:
Marcelo Bertalmio; Guillermo Sapiro; Vicent Caselles; Coloma Ballester; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| Inpainting, the technique of modifying an image in an undetectable form, is as ancient as art itself. The goals and applications of inpainting are numerous, from the restoration of damaged paintings and photographs to the removal/replacement of selected objects. In this paper, we introduce a novel algorithm for digital inpainting of still images that attempts to replicate the basic techniques used by professional restorators. After the user selects the regions ... |
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| Distance Functions and Geodesics on Points Clouds |
2005 |
11 pages |
| Authors:
Facundo Memoli; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| An algorithm for computing intrinsic distance functions and geodesics on sub-manifolds vector r(sup d) given by point clouds is introduced in this paper. The basic idea is that, as shown in this paper intrinsic distance functions and geodesics on general co-dimension sub-manifolds vector r(sup d) can be accurately approximated by the extrinsic Euclidean ones computed in a thin offset band surrounding the manifold. This permits the use of computationally optimal ... |
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| Dynamic Shapes Average |
2005 |
9 pages |
| Authors:
Pierre Maurel; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| A framework for computing shape statistics in general, and average in particular, for dynamic shapes is introduced in this paper. Given a metric d(-,-) on the set of static shapes, the empirical mean of N static shapes, C(sub 1),...,C(sub N), is defined by arg min(sub C) 1/N SIGMA (sup N, sub i=1) d(C,C(sub i))(exp 2). The purpose of this paper is to extend this shape average work to the case ... |
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| Non-Photorealistic Rendering from Stereo |
2005 |
8 pages |
| Authors:
A. Bartesaghi; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| A new paradigm for automatic non-photorealistic rendering is introduced in this paper. Non-photorealistic rendering (NPR) provides an alternative way to render complex scenes by emphasizing high level or salient perceptual features. Particularly, the pen-and-ink rendering style produces sketchy-like drawings that can effectively communicate shape and geometry. This is achieved by combining drawing primitives that mimic ink patterns used by artists. Existing NPR approaches can be categorized into two groups depending ... |
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| A New Approach for 3D Segmentation of Cellular Tomograms Obtained Using Three-Dimensional Electron Microscopy |
2005 |
5 pages |
| Authors:
A. Bartesaghi; Guillermo Sapiro; S. Lee; J. Lefman; S. Subramaniam; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| Electron tomography allows the determination of the three-dimensional structures of cells and tissues at resolutions significantly higher than is possible with optical microscopy. Electron tomograms contain, in principle, vast amounts of information on the locations and architectures of large numbers of subcellular assemblies and organelles. The development of reliable quantitative approaches for the interpretation of features in tomograms is an important problem, but it also is challenging because of the ... |
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| Conformal Surface Parameterization for Texture Mapping |
25 MAR 1999 |
20 pages |
| Authors:
Steven Haker; Sigurd Angenent; Allen Tannenbaum; Ron Kikinis; Guillermo Sapiro; Michael Halle; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| In this paper, we give an explicit method for mapping any simply connected surface onto the sphere in a manner which preserves angles. This technique relies on certain conformal mappings from differential geometry. Our method provides a new way to automatically assign texture coordinates to complex undulating surfaces. We demonstrate a finite element method that can be used to apply our mapping technique to a triangulated geometric description of a ... |
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