Resumo

PELCASTRE, Fernando et al. HALFTONING: REVIEW AND ANALYSIS. Rev. ing. univ. Medellín [online]. 2012, vol.11, n.21, pp.161-174. ISSN 1692-3324.

Halftoning is an indispensable technique used for showing digital images on screen and printing them on paper using any kind of printer such as Inkjet and Laser. Additionally, halftoning technique has been employed recently in several applications in the computation and communication fields, such as compression and authentication of images, visual cryptography, etc. This article provides as detailed review of the main halftoning methods, such as ordered dither, error diffusion, error diffusion with edge emphasis, dot diffusion, green noise, and direct binary search. For analyzing advantages and disadvantages of each halfoning method, a quality comparison of the halftone image generated by the already named methods was performed using Mean Opinion Score (MOS) measurement. Likewise, computational complexity of each halftoning method was taken into consideration.

Palavras-chave : Halftoning; binary image; human visual system; printing.

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