Abstract: System for determining a distortion model for an optically distorting medium, the system including an image sensor located at an image acquisition position behind the optically distorting medium, and an image processor coupled with the image sensor, the image sensor acquiring an obstructed image of an object located substantially at infinity, when the optically distorting medium is located between the image sensor and the object in a line of sight connecting the image sensor and the object, the image sensor acquiring an unobstructed image of the object, when the optically distorting medium is absent from the line of sight, the image processor receiving information respective of the obstructed image and the unobstructed image from the image sensor, the image processor identifying a plurality of features in the unobstructed image, and a respective feature in the obstructed image for each of the identified features in the unobstructed image, thereby determining pairs of associated features, the image processor d

Abstract: A night vision coloring system may color a scene by extracting the spectral signature of each area in a scene and matching the extracted signature with a predetermined database signature and associated color. The system may comprise a temporal or spatial filtering element that may typically allow the capturing of an image reflection through a plurality of spectral bands, thereby extracting the spectral signature of each area in the image. The color associated with the matched database signature may be used to color each area comprising the image.

Abstract: A computer-aided design system in which a mechanical quantity of a structure can be determined from stored geometrical representation of the structure, the material properties thereof and the loads imposed thereon, comprising: generating data describing a structure as a mesh; generating by application of the finite element method to the mesh, the elements of a stiffness matrix, a loading vector, and a vector including an associated degree of freedom index for each row and column of the stiffness matrix, generating from the stiffness matrix and the loading vector elements of matrix A and a right hand-side vector f, where A and f are related through the relation Ax=f, the vector x representing a mechanical quantity at a plurality of points of the mesh; and a linear solver of the preconditioned conjugate gradient type for generating, for subsequent processing or display, the elements of the vector x from A and f using a preconditioning matrix, the system being characterised in that the linear solver comprises ge

Abstract: In a computer aided design system, a stored geometrical representation of a structure, the material properties thereof, and the loads imposed thereon are converted into a visualization of a mechanical quantity of the structure. A mesh is generated that describes the structure. By application of the finite element method to the mesh, the elements of a stiffness matrix, a loading vector and a vector including an associated degree of freedom index for each row and column of the stiffness matrix is generated. From the stiffness matrix and the loading vector, a matrix A and a right-hand side vector f are generated. A and f are related through the equation Ax=f, wherein the vector x represents the mechanical quantity at points of the mesh. A linear solver of the preconditioned conjugate gradient-type generates the elements of the vector x from A and f using a preconditioning matrix K.