DocumentCode :
590815
Title :
Efficient lossless bit depth scalable coding for HDR images
Author :
Iwahashi, Masahiro ; Kiya, Hitoshi
Author_Institution :
Nagaoka Univ. of Technol., Nagaoka, Japan
fYear :
2012
fDate :
3-6 Dec. 2012
Firstpage :
1
Lastpage :
4
Abstract :
This report proposes two layered bit depth scalable coding methods for high dynamic range (HDR) images expressed in floating point data format. From the base layer bit stream, low dynamic range (LDR) images are decoded. They are tone mapped appropriately for human eye sensitivity, and shortened to a standard bit depth, e.g. 8 [bit]. From the enhance layer bit stream, HDR images are decoded. However the bit depth of this layer has been huge in the existing method. To reduce it, we divide the tone mapping into a reversible logarithmic mapping and its compensation. It was confirmed that the proposed methods significantly reduce the bit depth of the enhance layer, even though the compensation slightly increases coding noise.
Keywords :
decoding; image coding; HDR images; floating point data format; high dynamic range images; lossless bit depth scalable coding; reversible logarithmic mapping; tone mapping; Discrete wavelet transforms; Dynamic range; Encoding; Image coding; Noise; Streaming media; Transform coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal & Information Processing Association Annual Summit and Conference (APSIPA ASC), 2012 Asia-Pacific
Conference_Location :
Hollywood, CA
Print_ISBN :
978-1-4673-4863-8
Type :
conf
Filename :
6411962
Link To Document :
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