Vishwa Ranjan and Alain Fournier. "Volume Models for Volumetric Data". IEEE Computer, Vol. 27, No. 7, pp. 28--36, July 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....at every point, and they are acquired in the form of a discrete, finite sample of measurement taken over the continuum where the properties are defined. Considerable research efforts have been directed at modeling volume data, the majority of which have considered visualization problems [4, 5]. In [6] a variety of methods is presented to represent volumes, and some related research topics are discussed. There appears to be considerably less work available on models and data types for volumes intended as objects of computation. In particular, there isn t much work that we are aware of ....

V. Ranjan and A. Fournier, "Volume models for volumetric data," Tech. Rep. TR-93-50, 30, 1993.

....approximation of the surface, to remain under shape of a well ordered volume of voxels. This kind of representation is not the only. One can mention for instance, without being exhaustive : the representation by partitions of tetrahedrons [Berti92] the representation by overlapping balls [Ranja94][Attal95] the representation by skeleton [Attal95] Bitta95] These last two models have this advantage of being able to represent a compact manner shape that, a priori, is a pledge of efficiency. Besides, it is the main thing of our subject, the morphological skeleton presents itself ....

Ranjan,V., Fournier,A. 1994 Volume Models for Volumetrics Data, Computer IEEE 0018-9162,pp.28-36.

....support were based on version 3.1 of the ISIS toolkit. 7.1 Volume Rendering of Atmospheric Data For many scientific applications, the visualization of the results may be just as expensive as computing the results themselves. This is particularly true for computations that produce volumetric data [37]. For these applications, extensive computation is required to visualize the internal structure of three dimensional object rather than simply their surfaces. As such, the visualization process may itself benefit from parallelization. As an instance of this problem domain, we have used Paralex to ....

V. Ranjan and A. Fournier. Volume Models for Volumetric Data. IEEE Computer, vol. 27, no. 7, July 1994, pp. 28--36.

....visual information about both the surface and the interior of the body being displayed. Although Drebin divided his volumes into rectangular voxels, new methods have been proposed to simplify volume representation, thereby reducing the amount of time required to render and manipulate the volume [Ranjan and Fournier, 1994]. A simpler method of examining the volume is to move through it along some user defined axis. At each step, a two dimensional cut through the volume is displayed. If we choose to move along the slice axis, the problem is further simplified, since the original slices can simply be shown one ....

Ranjan, V. and Fournier, A. 1994. Volume models for volumetric data. IEEE Computer 27, 7, 28--36.

....of two views of the same object, or in automatic in betweening in key frame animation. The union of spheres (UoS) representation in which the set union of overlapping spheres is used to represent 3D objects is a computer representation of an object which has useful features for many applications [7]. In this paper we present an algorithm to interpolate between two UoS representations of the same or different object(s) The approach is to first match the spheres from one UoS representation to the other and then interpolate between the matched spheres. 2 Shape transformation problem We want ....

....While it is a necessary condition, it is not a sufficient one. The combination of stability and the use of volume primitives is the motivation behind the UoS representation. Ranjan and Fournier showed how we can obtain stable UoS models for objects from volumetric (e.g. CT or MRI scans) data [7], from range finder data, and from a ray traceable model of an object. This includes all object representations currently used in computer graphics. We propose to show that the UoS representation can be used advantageously for shape interpolation. Here are some of the reasons: ffl As said above, ....

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V. Ranjan and A. Fournier. "Volume models for volumetric data", IEEE Computer, Vol. 27, No. 7, July 1994, pp. 28--36.

....the input is a discrete set of points on the boundary of an object defined in 3D discrete volumetric data such as a CT scan or MRI. The boundary points may be obtained by choosing a threshold (or isovalue) in the data or by other edge detection methods. The Algorithm Our method has two steps [4]. In the first step, we generate a UoS representation which is truthful to the input volumetric data in the following sense: a) all inside voxels are included in at least one sphere, b) no outside voxel is within any sphere, c) all boundary points are on the surface of at least one sphere, d) ....

V. Ranjan and A. Fournier. "Volume models for volumetric data", IEEE Computer, Vol. 27, No. 7, July 1994, pp. 28--36.

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Vishwa Ranjan and Alain Fournier. "Volume Models for Volumetric Data". IEEE Computer, Vol. 27, No. 7, pp. 28--36, July 1994.

No context found.

Ranjan, V., and A. Fournier, 1994; Volume models for volumetric data. IEEE Computer, 27(7), 28-36.

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