Impact of temporal coherence-based Tone Mapping on video compression

International audienceTone Mapping Operators (TMOs) aim at converting real world high dynamic range (HDR) images captured with HDR cameras, into low dynamic range (LDR) images that can be displayed on LDR displays. Even though most of the designed solutions provide good results for still HDR images, they are not efficient for tone mapping video sequences. The main issue is their inability to preserve the temporal correlation inherent in a video sequence. This has a consequence on the video compression efficiency. In this work, we show that higher compression ratios can be obtained by preserving the temporal coherency of a sequence. We evaluate temporal coherency and video compression in regard to two aspects. The first one evaluates the quality of the decoded LDR sequences after applying different TMOs. The second aspect assesses the quality of a reconstructed HDR sequence when a TMO and a codec are applied