Bit-Rate Adaptive Downsampling for the Coding of Multi-View Video with Depth Information
Bit-Rate Adaptive Downsampling for the Coding of Multi-View Video with Depth Information
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DOI：
10.1109/3dtv.2008.4547827
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
E. Ekmekcioglu;S. Worrall;A. Kondoz
中科院分区：
文献类型：
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作者：
E. Ekmekcioglu;S. Worrall;A. Kondoz
在本文中，提高压缩效率的多视点视频编码与深度信息的潜力进行了探索。所提出的技术在编码之前使用下采样，用于任意视图和深度图。提出了一种比特率自适应的缩小比决策方法，用于编码前的某些视图和深度图。彩色和深度视频由于其不同的特性和对合成的自由视点视频的影响而被单独考虑。视图间参考（如果存在）被下采样到与待编码的输入视频相同的分辨率。几个多视图与深度序列的结果表明，使用比特率自适应混合空间分辨率编码的视图和深度图可以实现节省比特率，相比，全分辨率和固定的深度-颜色比多视图编码时，合成的视点的质量被考虑。编码器中的计算复杂度同时显著降低，因为编码的块的数量减少，并且因此执行的块模式判决的数量减少。
In this paper, the potential for improving the compression efficiency of multi-view video coding with depth information is explored. The proposed technique uses downsampling prior to encoding, for arbitrary views and depth maps. A bit-rate adaptive downscaling-ratio decision approach is proposed for certain views and depth maps prior to encoding. Colour and depth videos are considered separately due to their different characteristics and effects on synthesized free view-point videos. The inter-view references, if present, are downsampled to the same resolution as the input video to be coded. The results for several multi-view with depth sequences indicate that using bit-rate adaptive mixed spatial resolution coding for both views and depth maps can achieve savings in bit-rate, compared to full resolution and fixed depth-to-colour ratio multi-view coding when the quality of synthesized viewpoints are considered. The computational complexity in the encoder is significantly reduced at the same time, since the number of blocks coded is reduced, and hence the number of block mode decisions carried out is reduced.