An efficient coding method based on wavelet transform is presented for color *** tristimulus signals R,G,B of the original images are first converted into the Y,I,Q signals,whichare then decomposed into the luminance ...
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An efficient coding method based on wavelet transform is presented for color *** tristimulus signals R,G,B of the original images are first converted into the Y,I,Q signals,whichare then decomposed into the luminance and edge subimages with the wavelet ***,the edgesubimages are encoded with edge pattern vector quantization while the cosine transform coding method isused to encode the luminance *** results are obtained for coding of color images in thebitrate range from 0.24 to 0.50 bits/***,because of the simplicity of the structure in ourmethod,it is suitable for hardware implementation,and can be used in real time encoding system.
A generalized radiosity method based on the theory of light energy transfer between two differentialdiffuse surface areas is *** the conventional one,our method assumes radiosity tobe variable with each surface *** li...
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A generalized radiosity method based on the theory of light energy transfer between two differentialdiffuse surface areas is *** the conventional one,our method assumes radiosity tobe variable with each surface *** limiting the unknowns to radiosities of differential surface areaslocated at all vertices of surface patches,we have established a complete set of approximated *** generalized radiosity equation has been extended to non-diffuse *** and experimental results demonstrate the great potential of this method.
Generalizing the computational geometric support for the representation of designed artefacts over multiple different levels of symbolic abstractions (e.g. sketches, solid modelling, and drafting) is discussed. First,...
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Generalizing the computational geometric support for the representation of designed artefacts over multiple different levels of symbolic abstractions (e.g. sketches, solid modelling, and drafting) is discussed. First, the need for integrating the representation and manipulation of points, lines, polygons, and solids to facilitate design of artefacts at many levels of design abstraction is established. Second, a vertically integrated model that supports the representation and manipulation of points, lines, polygons, and solids without redundancy is presented. The particular roles of the operators and the operands are discussed, along with their hierarchical integration. The utility of the model is demonstrated in performing operations that involve multiple levels of data abstraction, such as splitting solids at a polygon inscribed on their boundary. Finally, a particular implementation of the integrated model is presented. This implementation is based on the hybrid edge, a derivative of Baumgart's winged edge and Eastman's split edge models. The hybrid edge distinguishes between the role of edges as carriers of topological adjacency information and their role as carriers of directionality information. This distinction permits the hybrid edge to handle the different combinations of adjacency and directionality requirements posed by the different abstraction levels in the integrated model.
This paper discusses the Interactive graphics System used by the General Electric Company, Medium Steam Turbine Department (Engineering & Manufacturing) for designing, drafting, and manufacturing applications. A b...
This paper discusses the Interactive graphics System used by the General Electric Company, Medium Steam Turbine Department (Engineering & Manufacturing) for designing, drafting, and manufacturing applications. A brief overview of the hardware malting up the system is described, followed by a more detailed description of the actual applications. Two-dimensional applications described include a Heat Balance Analysis, Flow Diagrams, and Electrical Schematics. A more fruitful area for increased productivity gains is described in the three-dimensional or mechanical applications including turbine design & layout and bucket design. coordination of the design with manufacturing for numerical control tape generation is described through CAM and Plate Frame Cutting applications. Finally, a short review of the engineering design work using Interactive graphics is discussed. Productivity gains of 2.6 to 1 are being realized, and the overall savings to the Medium Steam Department are outlined.
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