Simple multilevel halftoning excelled in gradation reproducibility.
A simple multilevel halftoning method, which is based on the conventional error diffusion method and realizes halftoning excelled in the distribution of dots, is proposed. The proposed method consists of three steps, e.g., the image decomposition, the generation of binary halftone images by the error diffusion, and the synthesis of a multilevel halftone image, and each step does not require a complicated algorithm. The effectiveness of the proposed method is indicated by applying it to three- and four-level halftoning of gray-tone and natural images.
Suetake
Noriaki
N
Graduate School of Science and Engineering, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8512, Japan. suetake@sci.yamaguchi-u.ac.jp
Sakano
Morihiko
M
Nakashima
Erika
E
Uchino
Eiji
E