Patent ID: 6522425
Filing Date: 2003-02-18
Classification: G06T,H04N

Abstract:
The method of predicting and processing image fine structures, comprising:separating pixel values of an original image into pixels for each of CMY or CMYK plates; converting the pixels separated in said separating step to pixel values for predicting image fine structures which will appear in a printed halftone image, by subjecting the values of the pixel to be converted and neighboring pixels to weighted averaging with adjustable weights dependent on the period of grid units that is determined by the screen ruling and screen angle for said printed halftone image, wherein said pixel values for predicting image fine structures which will appear in a printed halftone image is image data of a continuous tone image; wherein said weights dependent on the period of grid units are arranged in the respective elements of a weighting matrix of the same mask size as said neighboring pixels, wherein if the weights to be arranged in the respective elements of said weighting matrix are written as F(i, j, k, l), if E(k, l) is written for a coefficient matrix of the same size as said weighting matrix, said coefficient matrix having a coefficient of 1.0 at the center and a coefficient of 0 in the other positions and if the coefficient of said weight adjustment is written as &agr;, then the weight to be arranged in the respective elements of said weighting matrix after weight adjustment are given by the following equation (1): Fâ€²(i,j,k,l)=&agr;{âˆ’E(k,l)+F(i,j,k,l)}+E(k,l)â€ƒâ€ƒ(1) where (i, j) represents the coordinates of the position at which said pixel to be converted is located in said original image, and (k,l) represents the coordinates in the weighting matrix of the same mask size as the pixel to be converted and said neighboring pixels.