HALFTONING USING PATTERN MATRIX AND FORMATION OF PATTERN MATRIX

摘要

PPROBLEM TO BE SOLVED: To provide a technology capable of easily enhancing print results when a density pattern method is utilized. PSOLUTION: The image processing method comprises a step for forming a dot image indicating the formation state of a plurality of kinds of dot using an image subjected to color reduction. In this step, a plurality of pattern matrices corresponding to a plurality of gray levels are prepared previously at first. Each pattern matrix consists of a plurality of block patterns arranged in matrix where each block pattern consists of a plurality of dot elements arranged in matrix and each dot element exhibits a plurality of kinds of dot formation states. A pattern matrix is then selected depending on the gray level of an object pixel in an image subjected to color reduction, and a block pattern arranged at a corresponding position in the selected pattern matrix is selected depending on the position of the object pixel. PCOPYRIGHT: (C)2006,JPO&NCIPI