A robust technique for image descreening based on the wavelet transform

Author

Luo, Jiebo ; de Queiroz, Ricardo ; Fan, Zhigang

Volume

46

Issue

4

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

1179

Lastpage

1184

Abstract

In this correspondence, a novel wavelet-based approach to recover continuous-tone (contone) images from halftone images is presented. Wavelet decomposition of the halftone image facilitates a series of spatial and frequency selective processing to preserve most of the original image contents while eliminating the halftone noise. Furthermore, optional nonlinear filtering can be applied as a postprocessing stage to create the final aesthetic contone image. This approach lends itself to practical applications since it is independent of parameter estimation and, hence, universal to all types of halftoned images, including those obtained by scanning printed halftones

Keywords

filtering theory; image reconstruction; noise; nonlinear filters; parameter estimation; wavelet transforms; continuous-tone image recovery; frequency selective processing; halftone images; halftone noise elimination; image descreening; image reconstruction; nonlinear filtering; parameter estimation; postprocessing stage; printed halftones scanning; robust technique; spatial selective processing; wavelet decomposition; wavelet transform; Constraint optimization; Continuous wavelet transforms; Digital images; Filtering; Frequency; Image processing; Optimization methods; Robustness; Smoothing methods; Wavelet transforms;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.668572

Filename

668572