Nonlinear image representation for efficient perceptual coding

Jesús Malo, Irene Epifanio, Rafael Navarro, Eero P. Simoncelli

Research output: Contribution to journalArticle

Abstract

Image compression systems commonly operate by transforming the input signal into a new representation whose elements are independently quantized. The success of such a system depends on two properties of the representation. First, the coding rate is minimized only if the elements of the representation are statistically independent. Second, the perceived coding distortion is minimized only if the errors in a reconstructed image arising from quantization of the different elements of the representation are perceptually independent. We argue that linear transforms cannot achieve either of these goals and propose, instead, an adaptive nonlinear image representation in which each coefficient of a linear transform is divided by a weighted sum of coefficient amplitudes in a generalized neighborhood. We then show that the divisive operation greatly reduces both the statistical and the perceptual redundancy amongst representation elements. We develop an efficient method of inverting this transformation, and we demonstrate through simulations that the dual reduction in dependency can greatly improve the visual quality of compressed images.

Original languageEnglish (US)
Pages (from-to)68-80
Number of pages13
JournalIEEE Transactions on Image Processing
Volume15
Issue number1
DOIs
StatePublished - Jan 2006

Keywords

  • Independent components
  • JPEG
  • Nonlinear response
  • Perceptual independence
  • Perceptual metric
  • Scalar quantization
  • Statistical independence
  • Transform coding

ASJC Scopus subject areas

  • Software
  • Computer Graphics and Computer-Aided Design

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