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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
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/11/01
Online ISSN: 1745-1337
Type of Manuscript: Special Section LETTER (Special Section on Smart Multimedia & Communication Systems)
index transformation, coding, sparse histogram, PIZ, ZIP,
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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.