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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 5, Iss. 10 — Oct. 10, 2007
  • pp: 573–576

A robust method for inverse halftoning via two-dimensional nonlinear pyramid

Yueping Kong and Ping Zeng  »View Author Affiliations

Chinese Optics Letters, Vol. 5, Issue 10, pp. 573-576 (2007)

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Based on the principle of spatial pyramid for signal, a multi-scale transform of two-dimensional (2D) interpolating pyramid is constructed by the nonlinear median operator. The transform properties of error diffuse halftoning noise on multiple scales are investigated and analyzed through experiments. According to these properties, a robust inverse halftoning method is proposed. The halftoning image is firstly preprocessed by a Gaussian low-pass filter, and decomposed by the one-scale transform. Then a Wiener filter is employed to the detailed coefficients. Finally an inverse image is reconstructed. Experimental results show that the proposed transform has the advantage of separating the halftoning noise and image detail over linear multi-resolution transform. The presented inverse halftoning method performs some excellent abilities on sharp edge, high peak signal-to-noise ratio (PSNR), and small memory requirement.

© 2007 Chinese Optics Letters

OCIS Codes
(100.2000) Image processing : Digital image processing
(100.2810) Image processing : Halftone image reproduction
(330.6130) Vision, color, and visual optics : Spatial resolution
(350.6980) Other areas of optics : Transforms

Yueping Kong and Ping Zeng, "A robust method for inverse halftoning via two-dimensional nonlinear pyramid," Chin. Opt. Lett. 5, 573-576 (2007)

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