Patent ID: 6625329
Filing Date: 2003-09-23
Classification: G06T

Abstract:
A method for improving the definition of a digitized image whose image elements are stored light-intensity values that are organized in rows and columns as an output matrix Axy, with a respective matrix section Aij of 2nÃ—2m elements, the respective matrix section Aij having a position and being expanded, through reflection at two of its adjacent edges, and a corner formed by these edges, to 2n+1Ã—2m+1 elements, then subjected to a Fourier transformation, to form a transformed matrix, Bij, 1&lE;i&lE;2n+1, 1&lE;j&lE;2m+1, the transformed matrix being converted through elementary multiplication with an image-aberration correction matrix Cij (all elements being real) into a corrected, transformed matrix Bâ€²ij, and transformed back into an intensity matrix Aâ€²ij, from which a core section is set into the center of a corrected intensity matrix Aâ€²xy, corresponding to the position of the matrix section Aij, and one matrix section is processed after another in this way, staggered by one edge length of the core section, until a complete, corrected intensity matrix Aâ€²xy is obtained, characterized in that the image-aberration correction matrix is determined as a function of location in that a location-dependent aberration-correction matrix from an MTF correction function are determined to match given MTF values of a lens used to image the digitized image, and these local aberration-correction matrices are selected as a subset of the aberration-correction matrix, corresponding to the position of an associated matrix section, relative to the position of a center point of an image circle, and the distance and the tangential and radial angles of the edges of the matrix section from this center point.