Inter-layer prediction for backwards compatible high dynamic range video coding with SVC

Abstract

We present a backwards compatible high dynamic range video coding framework based on H. 264/AVC. It allows to extract a standard low dynamic range (LDR) as well as high dynamic range (HDR) video from one compressed bit stream. A joint global and local inter-layer prediction method is proposed to reduce the redundancy between the LDR and HDR layers. It is based on a common color space which can represent HDR video data perceptually lossless. We show how the inter-layer prediction parameters can be estimated in a rate-distortion optimized way and efficiently encoded to reduce side information. Our evaluations demonstrate that the proposed framework performs best, compared to the state-of-the-art for arbitrary tone-mapping operators. W.r.t. simulcast it allows for up to 50% bit rate saving

Template based inter-layer prediction for high dynamic range scalable compression

“…The LDR base layer in figure 5(b) was generated with the local TMO mantiuk06. Figure 5(c) represents the prediction results with our template based method, while figure 5(d) is the prediction obtained with our implementation of the blockwise linear prediction [13]. Note that for figure 5(d), the linear regression is computed directly on the current block and the slope and offset parameters are transmitted for each block.…”

“…The method from Garbas and Thoma [13] was chosen for the encoding of the resulting slope and offset parameters. This is, to our knowledge, the most advanced method from that point of view.…”

“…In [10], only global ILP is performed. In [11][12][13], the authors implemented a local ILP method in an H.264/AVC encoder. For each block (e.g.…”

“…Unlike the existing local ILP scheme [11][12][13], the parameters required for our prediction do not need to be transmitted. Both the encoder and decoder can determine those parameters using the neighbouring pixels contained in a template of the current block.…”

Adaptive re-quantization for high dynamic range video compression

“…Several other HDR compression methods such as [9], [10] and [11] consist in encoding a base LDR layer and combining it with a residual HDR enhancement layer. With this approach, each layer can be encoded at low bit depth using a classical compression scheme.…”