TDMD: A Database for Dynamic Color Mesh Subjective and Objective Quality Explorations

TL;DR

This paper introduces TDMD, the largest dynamic colored mesh database with subjective and objective quality assessments, enabling better understanding of distortions and improving quality metrics for DCMs.

Contribution

The creation of the comprehensive TDMD database with subjective scores and evaluation of multiple objective metrics for DCM quality assessment.

Findings

Large-scale subjective experiment with 303 samples.

Evaluation of image-based, point-based, and video-based metrics.

Insights into strengths and weaknesses of current metrics.

Abstract

Dynamic colored meshes (DCM) are widely used in various applications; however, these meshes may undergo different processes, such as compression or transmission, which can distort them and degrade their quality. To facilitate the development of objective metrics for DCMs and study the influence of typical distortions on their perception, we create the Tencent - dynamic colored mesh database (TDMD) containing eight reference DCM objects with six typical distortions. Using processed video sequences (PVS) derived from the DCM, we have conducted a large-scale subjective experiment that resulted in 303 distorted DCM samples with mean opinion scores, making the TDMD the largest available DCM database to our knowledge. This database enabled us to study the impact of different types of distortion on human perception and offer recommendations for DCM compression and related tasks. Additionally, we have evaluated three types of state-of-the-art objective metrics on the TDMD, including image-based, point-based, and video-based metrics, on the TDMD. Our experimental results highlight the strengths and weaknesses of each metric, and we provide suggestions about the selection of metrics in practical DCM applications. The TDMD will be made publicly available at the following location: https://multimedia.tencent.com/resources/tdmd.