Artifact reduction with diffusion preprocessing for image compression

Iván Kopilović, Tamás Szirányi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We evaluate a preprocessing method for image compression artifact reduction based on nonlinear diffusion filtering that we proposed earlier. The method consists of using edge-adaptive diffusion processes before the discrete cosine transform (DCT)-JPEG compression. By using a simple measure for artifact reduction, we show that considerable artifact reduction is achieved with preprocessing at the same bit rate as, and with no greater error than, the original compression. We also show that preprocessing helps to preserve the true contours for image processing applications. An automatic parameter selection for the preprocessing is also proposed, considering the edge histogram of the image and depending on the compression ratio. We test the method for visual quality with extensive subjective measurements. We show that, depending on the image content, preprocessing can significantly improve the visual quality at low bit rates.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalOptical Engineering
Volume44
Issue number2
DOIs
Publication statusPublished - Feb 1 2005

Keywords

  • Anisotropic diffusion
  • Compression artifact
  • Contour validity
  • Image compression
  • Preprocessing
  • Scale space
  • Subjective quality

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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