Properties of combined blue noise patterns

With blue noise halftoning of color images, the issues of Moire patterns in conventional ordered dither techniques are replaced by the concerns of blue noise quality of overlaid blue noise patterns. We need to produce a high quality halftone image for many combinations of color planes, as well as for any single color plane. In this paper, we studied the properties and power spectrum characteristics of combined blue noise patterns. An approach is proposed which is based on digital filter techniques and can be used to generate a set of jointly-blue noise masks. The masks are individually blue noise and also produce blue noise patterns when the individual patterns are combined in the usual sense of color overlay.