L2 norm optimization of tone mapping for two layer lossless coding of HDR images

Author

Iwahashi, Masahiro ; Yoshida, Taichi ; Kiya, Hitoshi

Author_Institution

Dept. of Electr. Eng., Nagaoka Univ. of Technol., Nagaoka, Japan

fYear

2014

fDate

9-12 Dec. 2014

Firstpage

1

Lastpage

4

Abstract

This paper optimizes a tone mapping function in a backward compatible lossless coding of high dynamic range (HDR) images. The mapping function is designed so that it maximizes quality of decoded low dynamic range (LDR) images. An optimization procedure for a lossy coding system is extended to a lossless system under the condition that a user can specify arbitrary tone mapping function to produce an LDR image from the original HDR image. Superiority of the proposed method on the rate distortion curves of the LDR image was confirmed to be up to 7.5 dB in PSNR improvement for an image sample.

Keywords

decoding; image coding; optimisation; HDR images; L2 norm optimization; arbitrary tone mapping function; backward compatible lossless coding; decoded low dynamic range image quality maximization; high dynamic range images; image sample; lossy coding system; rate distortion curves; two layer lossless coding; Decoding; Dynamic range; Encoding; Image coding; Image reconstruction; Optimization; Streaming media;

fLanguage

English

Publisher

ieee

Conference_Titel

Asia-Pacific Signal and Information Processing Association, 2014 Annual Summit and Conference (APSIPA)

Conference_Location

Siem Reap

Type

conf

DOI

10.1109/APSIPA.2014.7041614

Filename

7041614