the proceedings contain 47 papers. the topics discussed include: finger spelling recognition from RGB-D information using kernel descriptor;feature learning by multidimensional scaling and its applications in object r...
ISBN:
(纸本)9780769550992
the proceedings contain 47 papers. the topics discussed include: finger spelling recognition from RGB-D information using kernel descriptor;feature learning by multidimensional scaling and its applications in object recognition;classifier selection based on the correlation of diversity measures: when fewer is more;using unsupervised learning for graph construction in semi-supervised learning with graphs;a multipotential field model for crowds with scalable behaviors;applications of conformal geometric algebra in mesh deformation;multiphase flow of incompressible fluids employing regional level set and volume control;exploiting space and time coherence in grid-based sorting;change detection in human crowds;a tensor motion descriptor based on multiple gradient estimators;and real-time object tracking in high-definition video using frame segmentation and background integral images.
Eye tracking is an active multidisciplinary research field, which has shown great progress in the last decades. Eye tracking is the process of monitoring eye movements in order to determine the point of gaze or to ana...
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We present a method that interpolates new shapes between a given pair of source and target shapes. To this end, we utilize a database of related shapes that is used to replace the direct transition from the source to ...
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In electronic communications one of the most important concepts that students must learn is that of time and frequency representation of communication signals. Examples in most text books do not convey some of the imp...
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In electronic communications one of the most important concepts that students must learn is that of time and frequency representation of communication signals. Examples in most text books do not convey some of the important characteristics of complex communication signals. Students must be able to analyze the time and frequency representation of a signal, modify parameters, and immediately see the effect. An effective way of doing this is using a numerical computation and graphics program such as MATLAB.
In this paper, a new technique for modeling textured 3D faces is introduced. 3D faces can either be generated automatically from one or more photographs, or modeled directly through an intuitive user interface. Users ...
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ISBN:
(纸本)0201485605
In this paper, a new technique for modeling textured 3D faces is introduced. 3D faces can either be generated automatically from one or more photographs, or modeled directly through an intuitive user interface. Users are assisted in two key problems of computer aided face modeling. First, new face images or new 3D face models can be registered automatically by computing dense one-to-one correspondence to an internal face model. Second, the approach regulates the naturalness of modeled faces avoiding faces with an "unlikely" appearance. Starting from an example set of 3D face models, we derive a morphable face model by transforming the shape and texture of the examples into a vector space representation. New faces and expressions can be modeled by forming linear combinations of the prototypes. Shape and texture constraints derived from the statistics of our example faces are used to guide manual modeling or automated matching algorithms. We show 3D face reconstructions from single images and their applications for photo-realistic image manipulations. We also demonstrate face manipulations according to complex parameters such as gender, fullness of a face or its distinctiveness.
the cone-beam computer tomography (CT) is a new non-destructive testing method which can be used in electronics industry. In the same manner like in the well-established x-ray microscopy the information of the inside ...
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ISBN:
(纸本)0780380029
the cone-beam computer tomography (CT) is a new non-destructive testing method which can be used in electronics industry. In the same manner like in the well-established x-ray microscopy the information of the inside structure of the tested sample results from the attenuation of the x-ray radiation while transition through the object. In contrast to the known principle of fan-shaped CT in medical application, the cone-beam CT uses a volumetric beam to scan the test object and therefore obtains a series of 2D images. the reconstruction of these scans leads to a 3-dimensional model of the tested object. the typical application of this method is the visualization of the inner and outer structures of electronic components, packaging and interconnection technologies, e.g. flip chip (FC) and (micro) ball grid arrays (BGA, muBGA). the radiation of an x-ray tube is usually polychromatic, which means that the x-ray photons have different energies. Low energetic radiation is better absorbed in the material than the higher energetic one. For best imaging results the cone-beam CT requires monochromatic radiation and therefore beam-hardening is performed. the resulting hardened radiation will still not be monochromatic and causes artifacts in the imaging of the object, which have to be corrected. the paper will describe the basics of computer tomography and beam hardening and furthermore discuss methods to reduce the influence of beam hardening on the imaging quality of the measured objects.
Using multiple reference images in 3D image warping has been a challenging problem. Recently, the Layered Depth Image (LDI) was proposed by Shade et al. to merge multiple reference images under a single center of proj...
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ISBN:
(纸本)0201485605
Using multiple reference images in 3D image warping has been a challenging problem. Recently, the Layered Depth Image (LDI) was proposed by Shade et al. to merge multiple reference images under a single center of projection, while maintaining the simplicity of warping a single reference image. However it does not consider the issue of sampling rate. We present the LDI tree, which combines a hierarchical space partitioning scheme withthe concept of the LDI. It preserves the sampling rates of the reference images by adaptively selecting an LDI in the LDI tree for each pixel. While rendering from the LDI tree, we only have to traverse the LDI tree to the levels that are comparable to the sampling rate of the output image. We also present a progressive refinement feature and a "gap filling" algorithm implemented by pre-filtering the LDI tree. We show that the amount of memory required has the same order of growth as the 2D reference images. this also bounds the complexity of rendering time to be less than directly rendering from all reference images. Copyright ACM 1999.
Stone is widespread in its use as a building material and artistic medium. One of its most remarkable qualities is that it changes appearance as it interacts withthe environment. these changes are mainly confined to ...
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ISBN:
(纸本)0201485605
Stone is widespread in its use as a building material and artistic medium. One of its most remarkable qualities is that it changes appearance as it interacts withthe environment. these changes are mainly confined to the surface but involve complex volumetric effects such as erosion and mineral dissolution. this paper presents an approach for the modeling and rendering of changes in the shape and appearance of stone. To represent stone, we introduce a slab data structure, which is a surface-aligned volume confined to a narrow region around the boundary of the stone. Our weathering model employs a simulation of the flow of moisture and the transport, dissolution, and recrystallization of minerals within the porous stone volume. In addition, this model governs the erosion of material from the surface. To render the optical effects of translucency and coloration due to the composition of minerals near the surface, we simulate the scattering of light inside the stone using a general subsurface Monte Carlo ray tracer. these techniques can capture many aspects of the time-dependent appearance of stone. We demonstrate the approach with models of granite and marble statues, as well as a sandstone column. Copyright ACM 1999.
the purpose of this paper is to describe a feasibility prototype of a computer-Aided Instruction (CAI) system, developed for mining engineering students and mine and safety personnel to teach the complex interrelation...
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the purpose of this paper is to describe a feasibility prototype of a computer-Aided Instruction (CAI) system, developed for mining engineering students and mine and safety personnel to teach the complex interrelationships between a mine ventilation system and a mine fire. the system employs an artificial intelligence technique to increase students' involvement in the learning process of `interrogation and confrontation.' To deepen the understanding of the problem, the author utilized heuristic as well as algorithmic methods combined to simulate, diagnose, and explain certain fire situations. the CAI system mentioned above uses extensively a mine fire simulator that enables a real time graphics animation of almost all the changes occurring in the ventilation network while under the influence of fire.
We present a solution to the general problem of characterizing shadows in scenes involving a uniform polygonal area emitter and a polygonal occluder in arbitrary position by manifesting shadow irradiance as a spline f...
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ISBN:
(纸本)0201485605
We present a solution to the general problem of characterizing shadows in scenes involving a uniform polygonal area emitter and a polygonal occluder in arbitrary position by manifesting shadow irradiance as a spline function. Studying generalized prism-like constructions generated by the emitter and the occluder in a four-dimensional (shadow) space reveals a simpler intrinsic structure of the shadow as compared to the more complicated 2D projection onto a receiver. A closed form expression for the spline shadow irradiance function is derived by twice applying Stokes' theorem to reduce an evaluation over a 4D domain to an explicit formula involving only 2D faces on the receiver, derived from the scene geometry. this leads to a straightforward computational algorithm and an interactive implementation. Moreover, this approach can be extended to scenes involving multiple emitters and occluders, as well as curved emitters, occluders, and receivers. Spline functions are constructed from these prism-like objects. We call them generalized polyhedral splines because they extend the classical polyhedral splines to include curved boundaries and a density function. the approach can be applied to more general problems such as some of those occurring in radiosity, and other related topics. Copyright ACM 1999.
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