HIDDEN MARKOV MODEL GENERATION OF MULTI-PLANE RANDOM SCREENS

摘要

Methods and systems for the in-situ creation of a halftone noise screen layer by layer. Each layer produced is a white noise uniform distributed screen, statistically similar to one generated by a uniform noise function. The generation of each layer, however, is driven by a screen state which is an error based metric on the mean screen threshold. The set of screens produced are not independent of each other; adjacent layers are negatively correlated, while non-adjacent layers are completely uncorrelated. The result of this screen creation is that for any color the variation of coverage across the viewed surface is smaller than the variation produced by randomly generated screen planes. The algorithm is computationally inexpensive and eliminates the need to store multiple screens in memory.

主权项

1. A method for the generation of multi-plane random screens, said method comprising:
generating at least one layer among a plurality of layers, said at least one layer comprising a white noise uniform distributed screen that is statistically similar to a layer generated by a uniform noise function, wherein said generating of said at least one layer is driven by a screen state that is an error based metric on a mean screen threshold; producing a set of white noise uniform distributed screens wherein each screen among said set of white noise uniform distributed screens are not independent of one another and adjacent layers among said plurality of layers are negatively correlated and non-adjacent layers among said plurality of layers are uncorrelated; and creating in-situ at least one halftone noise screen after generating said at least one layer and producing said set of white noise uniform distribution screens, such that for any color a variation of coverage across a viewed surface is smaller than variations produced by randomly generated screen planes.