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Backward compatible approaches for the compression of high dynamic range videos

Mikaël Le Pendu 1
1 Sirocco - Analysis representation, compression and communication of visual data
Abstract : In recent years, the display technologies have been rapidly evolving. From 3D television to Ultra High Definition, the trend is now towards High Dynamic Range (HDR) displays that can reproduce a luminance range far beyond the capabilities of conventional displays. The emergence of this technology involves new standardization effort in the field of video compression. In terms of large scale content distribution, the question of backward compatibility is critical. While the future generation of television displays will be adapted to this new format, it is necessary to enable the older equipment to decode and display a version of the same content whose dynamic range has been previously reduced by a process called “tone mapping”. This thesis aims at exploring the backward compatible HDR compression schemes. In a first approach, a tone mapping operator specified by the encoder is applied to the HDR image. The resulting image, called Low Dynamic Range (LDR), can then be encoded and decoded in a conventional format. The encoder additionally transmits a small amount of information enabling a HDR capable decoder to inverse the tone mapping operator and retrieve the HDR version. The study of these schemes is directed towards the definition of tone mapping operators optimized for the compression performance. We then focus on scalable approaches, where both versions are given to the encoder without prior knowledge on the tone mapping operator used. The producer thus keeps full control on the LDR content creation process. This LDR version is compressed as a first layer. The reconstructed image is used by the scalable encoder to compress the HDR layer efficiently by performing inter-layer predictions. Thanks to a local and non-linear approach, the proposed schemes improve the coding performance compared to the existing scalable methods, especially in the case where a complex tone mapping is used for generating the LDR version.
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Submitted on : Monday, May 9, 2016 - 11:41:39 AM
Last modification on : Friday, July 10, 2020 - 4:03:11 PM
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  • HAL Id : tel-01312901, version 1


Mikaël Le Pendu. Backward compatible approaches for the compression of high dynamic range videos. Image Processing [eess.IV]. Université Rennes 1, 2016. English. ⟨NNT : 2016REN1S002⟩. ⟨tel-01312901⟩



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