000224864 001__ 224864
000224864 005__ 20181203024526.0
000224864 0247_ $$2doi$$a10.1016/j.image.2016.10.004
000224864 022__ $$a0923-5965
000224864 02470 $$2ISI$$a000390634400002
000224864 037__ $$aARTICLE
000224864 245__ $$aEvaluation of JPEG XT for high dynamic range cameras
000224864 260__ $$bElsevier Science Bv$$c2017$$aAmsterdam
000224864 269__ $$a2017
000224864 300__ $$a12
000224864 336__ $$aJournal Articles
000224864 520__ $$aModern cameras can be used to capture high dynamic range (HDR) images by taking multiple low dynamic range (LDR) pictures at different exposure settings. However, DSLR cameras often store the multiple exposure pictures, which increases storage requirements proportionally to the number of exposures, while smartphones and tablets only store a tone-mapped representation of the HDR image instead of the original HDR data. In this paper, we investigate the bit rate reduction that could be achieved by storing HDR images compressed with JPEG XT, a JPEG backward-compatible HDR image compression standard, over multiple exposures JPEG. We also investigate the quality increase that could be achieved by fusing images with linear values and native sensor bit depth over pictures with sRGB gamma encoded values and 8 bits per sample. To investigate the impact of the different parameters on the performance, we perform a set of experiments with 14 contents, 4 resolutions (ranging from 2.5 megapixels (MP) to 16MP), 4 exposures configurations (2, 3, 5, and 7 exposures), 5 tone mapping operators (TMOs) used to generate the JPEG XT base layer, and 5 quality levels representative of values commonly used in smartphones and DSLR cameras. Results show that the performance is dependent on the TMO and number of exposures, with maximum average bit rate savings ranging from 10% for two exposures up to 70% for seven exposures. Additionally, quality improvements of 1.7 dB to 5.1 dB can be achieved when using the native image sensor data format.
000224864 6531_ $$aHigh dynamic range
000224864 6531_ $$aDigital photography
000224864 6531_ $$aImage storage
000224864 6531_ $$aImage coding
000224864 6531_ $$aJPEG XT
000224864 6531_ $$aCoding efficiency
000224864 700__ $$0245954$$g170391$$aHanhart, Philippe
000224864 700__ $$0240223$$g105043$$aEbrahimi, Touradj
000224864 773__ $$j50$$tSignal Processing-Image Communication$$q9-20
000224864 909C0 $$0252077$$pMMSPL
000224864 909CO $$ooai:infoscience.tind.io:224864$$pSTI$$particle
000224864 917Z8 $$x105043
000224864 937__ $$aEPFL-ARTICLE-224864
000224864 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000224864 980__ $$aARTICLE