Restoration of error-diffused images using projection onto convex sets

G B Unal; A E Cetin

doi:10.1109/83.974568

Restoration of error-diffused images using projection onto convex sets

IEEE Trans Image Process. 2001;10(12):1836-41. doi: 10.1109/83.974568.

Authors

G B Unal¹, A E Cetin

Affiliation

¹ Electr. and Comput. Eng. Dept., North Carolina State Univ., Raleigh, NC 27695-7914, USA.

PMID: 18255523
DOI: 10.1109/83.974568

Abstract

A novel inverse halftoning method is proposed to restore a continuous tone image from a given half-tone image. A set theoretic formulation is used where three sets are defined using the prior information about the problem. A new space-domain projection is introduced assuming the halftoning is performed using error diffusion, and the error diffusion filter kernel is known. The space-domain, frequency-domain, and space-scale domain projections are used alternately to obtain a feasible solution for the inverse halftoning problem which does not have a unique solution.