Two-layer coding algorithm for high dynamic range images based on luminance compensation

  • Authors:
  • Masahiro Okuda;Nicola Adami

  • Affiliations:
  • The University of Kitakyushu, 1-1 Hibikino, Wakamatu, Kitakyushu, Fukuoka 808-0135, Japan and University of Brescia, Via Branze, 38, 25123 Brescia, BS, Italy;The University of Kitakyushu, 1-1 Hibikino, Wakamatu, Kitakyushu, Fukuoka 808-0135, Japan and University of Brescia, Via Branze, 38, 25123 Brescia, BS, Italy

  • Venue:
  • Journal of Visual Communication and Image Representation
  • Year:
  • 2007

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Abstract

A two-layer coding algorithm for high dynamic range images is discussed. In the first layer, a low dynamic range image is encoded by a conventional codec, and then the residual information that represents the difference between an original and the decoded images in the first layer is encoded in the second layer, which realizes compatibility with conventional image file formats. Our method utilizes the approximation of an inverse tone mapping function that reduces the high dynamic range to a displayable range. Our algorithm significantly improves a compression performance, compared to conventional methods.