Research Article Open Access

An Image Dithering Via Tchebichef Moment Transform

Nur Azman Abu1, Ferda Ernawan2 and Nanna Suryana1
  • 1 Universiti Teknikal Malaysia Melaka, Malaysia
  • 2 Universitas Dian Nuswantoro, Indonesia

Abstract

Many image display applications and printing devices allow only limited number of colours. They have limited computational power and storage to produce high quality outputs on high bit-depth colour image. A dithering technique is called for here in order to improve the perceptual visual quality of the limited bit-depth images. A dithered image is represented by a natural colour in the low bit depth image colour for displaying and printing. This technique obtains low cost colour image in displaying the colour and printing image pixels. This study proposes the dithering technique based on Tchebichef Moment Transform (TMT) to produce high quality image at low-bit colour. Earlier, a 2×2 Discrete Wavelet Transform (DWT) has been proposed for better image quality on dithering. The 2×2 TMT has been chosen here since it performs better than the 2×2 DWT. TMT provides a compact support on 2×2 blocks. The result shows that 2×2 TMT gives perceptually better quality on colour image dithering in significantly efficient fashion.

Journal of Computer Science
Volume 9 No. 7, 2013, 811-820

DOI: https://doi.org/10.3844/jcssp.2013.811.820

Submitted On: 8 February 2013 Published On: 11 June 2013

How to Cite: Abu, N. A., Ernawan, F. & Suryana, N. (2013). An Image Dithering Via Tchebichef Moment Transform. Journal of Computer Science, 9(7), 811-820. https://doi.org/10.3844/jcssp.2013.811.820

  • 2,799 Views
  • 2,443 Downloads
  • 2 Citations

Download

Keywords

  • Image Dithering
  • Tchebichef Moments
  • Discrete Wavelet Transform