Scratches are one of the most frequent defects appearing in digital film restoration, usually resolved as missing information in subsequent frames of an image sequence in a vertical area of each frame. We describe som...
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Scratches are one of the most frequent defects appearing in digital film restoration, usually resolved as missing information in subsequent frames of an image sequence in a vertical area of each frame. We describe some methods for line scratch removal in digital image sequences, based on the idea of using an image model as simple as possible in order to interpolate scratch pixels, evaluating the displacement of such model from the real model in a neighbourhood of the scratch not affected by the defect, and correcting the reconstruction by adding the estimated displacement. Experimental results on real images are shown.
VRML is the standard language to build a virtual reality system, i.e. a language to describe 3D objects and interactive worlds. To use such a system, among the other tools, a browser is needed in order to access the i...
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VRML is the standard language to build a virtual reality system, i.e. a language to describe 3D objects and interactive worlds. To use such a system, among the other tools, a browser is needed in order to access the information in the VRML files and to visualize the virtual world from a human perspective. This paper describes the implementation of a VRML parallel browser based on a modified version of graphics libraries, such as OpenGL and GLUT. The obtained interactive parallel rendering engine has been developed for a message passing computing environment; a detailed analysis of its performance on a PC cluster is also described.
The parallel Naples airshed model (PNAM) is a parallel software package for the numerical simulation of photosmog episodes in urban scale domains. It solves the atmospheric diffusion equations, which model the air pol...
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The parallel Naples airshed model (PNAM) is a parallel software package for the numerical simulation of photosmog episodes in urban scale domains. It solves the atmospheric diffusion equations, which model the air pollution dynamics in a Eulerian approach, using a symmetric time‐splitting, where the advection is separated from the (coupled) diffusion and chemistry. Presents some results of a numerical simulation of a severe photochemical smog episode, which occurred in the Naples area. A preliminary comparison with measured data is reported, as a first step toward the validation of PNAM. Some parallel performance results, obtained on an IBM SP machine, are also shown.
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