Adaptive Green Noise Halftoning Algorithm with Optimal Hysteresis Constant

Adaptive green noise halftoning algorithm with the optimal hysteresis constant was proposed.A random number was used to select one of the pre-designed different error diffusion filters and alter the hysteresis constant based on the image gray level.Regular strips and nonuniform visual effect which are created because of point aggregation in a general green noise algorithm are effectively eliminated.Experiment results show that the halftone image produced by this algorithm can maintain the amplitude characteristic and guarantee visual uniformity.