PDF(Pubmed)
Abstract：
The recent rise in interest in point clouds as an imaging modality has motivated standardization groups such as JPEG and MPEG to launch activities aiming at developing compression standards for point clouds. Lossy compression usually introduces visual artifacts that negatively impact the perceived quality of media, which can only be reliably measured through subjective visual quality assessment experiments. While MPEG standards have been subjectively evaluated in previous studies on multiple occasions, no work has yet assessed the performance of the recent JPEG Pleno standard in comparison to them. In this study, a comprehensive performance evaluation of JPEG and MPEG standards for point cloud compression is conducted. The impact of different configuration parameters on the performance of the codecs is first analyzed with the help of objective quality metrics. The results from this analysis are used to define three rate allocation strategies for each codec, which are employed to compress a set of point clouds at four target rates. The set of distorted point clouds is then subjectively evaluated following two subjective quality assessment protocols. Finally, the obtained results are used to compare the performance of these compression standards and draw insights about best coding practices.
摘要：
最近对点云作为成像模态的兴趣的增加已经促使诸如JPEG和MPEG的标准化团体发起旨在开发点云的压缩标准的活动。有损压缩通常会引入视觉伪影，从而对媒体的感知质量产生负面影响，只有通过主观视觉质量评估实验才能可靠地测量。虽然MPEG标准在以前的研究中已经在多个场合进行了主观评估，还没有工作评估最近的JPEGPleno标准的性能相比，他们。在这项研究中,对JPEG和MPEG点云压缩标准进行了综合性能评价。首先借助客观的质量度量来分析不同配置参数对编解码器性能的影响。此分析的结果用于为每个编解码器定义三种速率分配策略，用于以四个目标速率压缩一组点云。然后根据两个主观质量评估方案对该组失真点云进行主观评估。最后,获得的结果用于比较这些压缩标准的性能，并得出有关最佳编码实践的见解。
