title: Restoration of error-diffused images using projection onto convex sets.
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.
authors.affiliation: Electr. and Comput. Eng. Dept., North Carolina State Univ., Raleigh, NC 27695-7914, USA.
authors.forename: G B
authors.initials: GB
authors.lastname: Unal
authors.forename: A E
authors.initials: AE
authors.lastname: Cetin