An Efficient Lossless Compression Method Using Histogram Packing for HDR Images in OpenEXR Format

Taku ODAKA; Wannida SAE-TANG; Masaaki FUJIYOSHI; Hiroyuki KOBAYASHI; Masahiro IWAHASHI; Hitoshi KIYA

doi:10.1587/transfun.E97.A.2181

Special Section on Smart Multimedia & Communication Systems

An Efficient Lossless Compression Method Using Histogram Packing for HDR Images in OpenEXR Format

Taku ODAKA, Wannida SAE-TANG, Masaaki FUJIYOSHI, Hiroyuki KOBAYASHI, Masahiro IWAHASHI, Hitoshi KIYA

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Keywords: index transformation, coding, sparse histogram, PIZ, ZIP

JOURNAL RESTRICTED ACCESS

2014 Volume E97.A Issue 11 Pages 2181-2183

DOI https://doi.org/10.1587/transfun.E97.A.2181

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Abstract

This letter proposes an efficient lossless compression method for high dynamic range (HDR) images in OpenEXR format. The proposed method transforms an HDR image to an indexed image and packs the histogram of the indexed image. Finally the packed image is losslessly compressed by using any existing lossless compression algorithm such as JPEG 2000. Experimental results show that the proposed method reduces the bit rate of compressed OpenEXR images compared with equipped lossless compression methods of OpenEXR format.

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