Patent ID: 7433083
Filing Date: 2008-10-07
Classification: H04N

Abstract:
1. A halftone-image processing device, comprising: an input portion that receives input image data for a plurality of pixels, the input image data including data indicative of a density value for each pixel, the plurality of pixels being grouped into a plurality of recording matrices, each recording matrix being formed of a prescribed number of pixels which are located adjacent to one another; a representative density calculating portion that calculates, based on the density values for the pixels located in one recording matrix, a representative density value that represents the densities of the pixels located in the subject recording matrix; a storage portion that stores a threshold table indicating a correspondence between a threshold value and an output dot number; a comparing portion that compares the representative density value calculated for the subject recording matrix to the threshold value in the threshold table and that determines an output dot number for the representative density value based on the compared result; and a dot-forming pixel determining portion that uses a random number to determine, based on the determined output dot number, pixels for which output dots are to be outputted among the pixels in the subject recording matrix to configure a half-tone output image, thereby generating output image data.