A Curvature-Tensor-Based Perceptual Quality Metric for 3D Triangular Meshes

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Fakhri Torkhani
Jean-Marc Chassery
Kai Wang

Keywords : 3D triangular mesh, perceptual quality, human visual system, objective metric, curvature tensor, visual masking
Perceptual quality assessment of 3D triangular meshes is crucial for a variety of applications. In this paper, we present a new objective metric for assessing the visual difference between a reference triangular mesh and its distorted version produced by lossy operations, such as noise addition, simplification, compression and watermarking. The proposed metric is based on the measurement of the distance between curvature tensors of the two meshes under comparison. Our algorithm uses not only tensor eigenvalues (i.e., curvature amplitudes) but also tensor eigenvectors (i.e., principal curvature directions) to derive a perceptually-oriented tensor distance. The proposed metric also accounts for the visual masking effect of the human visual system, through a roughness-based weighting of the local tensor distance. A final score that reflects the visual difference between two meshes is obtained via a Minkowski pooling of the weighted local tensor distances over the mesh surface. We validate the performance of our algorithm on four subjectively-rated visual mesh quality databases, and compare the proposed method with state-of-the-art objective metrics. Experimental results show that our approach achieves high correlation between objective scores and subjective assessments.

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Torkhani, F., Chassery, J.-M., & Wang, K. (2014). A Curvature-Tensor-Based Perceptual Quality Metric for 3D Triangular Meshes. Machine Graphics and Vision, 23(1/2), 59–82. https://doi.org/10.22630/MGV.2014.23.1.4

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