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A multiscale error diffusion technique for digital multitoning.

Giorgos Sarailidis1, Ioannis Katsavounidis

  • 1Department of Computer and Communication Engineering, University of Thessaly, 32218 Volos, Greece. gesareli@inf.uth.gr

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|January 31, 2012
PubMed
Summary

This study introduces a novel multiscale error diffusion method for digital image multitoning, enhancing print quality by reducing banding. The technique utilizes quadtrees and maximum intensity guidance for superior blue-noise characteristics.

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Area of Science:

  • Digital image processing
  • Color science
  • Computer graphics

Background:

  • Multitoning represents digital images using limited color intensities (quantization levels), generalizing halftoning.
  • It is crucial for printing applications, applicable to both color and grayscale images.
  • Banding is a common artifact in error diffusion multitoning, particularly in areas with uniform or near-uniform intensity values.

Purpose of the Study:

  • To present a new method for producing multitones using multiscale error diffusion.
  • To address and alleviate the problem of banding in multitoned images.
  • To evaluate the proposed method's performance visually and quantitatively.

Main Methods:

  • Utilizing an image quadtree for image decomposition.
  • Employing "maximum intensity guidance" to determine pixel quantization order.
  • Implementing noncausal error diffusion with a preprocessing step to mitigate banding.

Main Results:

  • The proposed method effectively reduces banding artifacts in multitoned images.
  • Visual inspection confirms improved image quality.
  • Quantitative metrics demonstrate blue-noise characteristics and low anisotropy, indicating high-quality output.

Conclusions:

  • The multiscale error diffusion technique offers a robust solution for high-quality multitoning.
  • The method successfully overcomes limitations of traditional error diffusion, particularly banding.
  • The resulting multitones exhibit desirable properties for printing applications.