Patent ID: 6141461
Filing Date: 2000-10-31
Classification: G06T

Abstract:
A high-pass filtering process for focusing images which are composed of a matrix of a plurality of pixels having respective luminous intensities, the filtering process comprises:providing for each pixel of the image a respective correction of the intensity of said each pixel, which respective correction is calculated on the basis of high-pass filterings performed in at least one direction with respect to the matrix of the pixels forming the image,wherein the high-pass filter determines the respective correction of each pixel under examination,said respective correction being based on a mean of the respective intensities of at least one pair of the pixels being at predetermined distances from and on opposite sides of the pixel under examination, with reference to the at least one direction, creating a corresponding new filtered image, composed of the corrected pixels,wherein the respective correction of the intensity of each pixel is calculated on the basis of high-pass filterings performed in a plurality of directions; and the respective correction is based on a mean of the respective intensities of a plurality of pairs of the pixels.