Parallel error diffusion method and apparatus.

摘要

In order to display a continuous tone colour image on a discrete colour level display, methods of halftoning must be used. The high display rate of colour output devices means that serial methods of real time halftoning are difficult to use. Method and apparatus (26) is disclosed for reducing the speed with which a halftoning method must be performed by performing the halftoning of an output image in parallel by means of dividing the input image (25) into a number of areas (10,11,12), and halftoning the areas individually in parallel (65), making special provisions for pixels located in the boarder regions of a given area. <IMAGE>