MPEG与JPEG Pleno点云压缩码率分配策略的主观性能评估
Subjective performance evaluation of bitrate allocation strategies for MPEG and JPEG Pleno point cloud compression
AI总结：
本研究针对点云压缩的MPEG与JPEG Pleno标准，结合客观指标分析配置参数影响，设计多套码率分配策略并开展双协议主观评估，对比了两类标准的性能并总结最佳编码实践。
摘要：
近年来，点云作为一种成像模态受到的关注度不断提升，推动了MPEG、JPEG Pleno等标准化组织启动点云压缩标准的制定工作。有损压缩通常会引入视觉伪影，对媒体的感知质量造成负面影响，而这类影响只能通过主观视觉质量评估实验进行可靠测量。已有研究多次对MPEG标准开展过主观评估，但目前尚无工作将最新的JPEG Pleno标准与MPEG标准进行性能对比评估。本研究对点云压缩领域的MPEG与JPEG Pleno标准开展了全面的性能评估。研究首先借助客观质量指标，分析了不同配置参数对编解码器性能的影响。基于该分析结果，研究为每种编解码器定义了三种码率分配策略，并用这些策略将一组点云压缩至四个目标码率。随后，研究遵循两种主观质量评估协议，对生成的失真点云集进行了主观评估。最后，研究利用所得结果对比了这些压缩标准的性能，并总结出了最佳编码实践的相关见解。
英文摘要：
The recent rise in interest in point clouds as an imaging modality has motivated standardization groups such as MPEG and JPEG Pleno 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 MPEG and JPEG Pleno 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.
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