New measurements reveal weaknesses of image quality metrics in evaluating graphics artifacts

Abstract

Reliable detection of global illumination and rendering artifacts in the form of localized distortion maps is important for many graphics applications. Although many quality metrics have been developed for this task, they are often tuned for compression/transmission artifacts and have not been evaluated in the context of synthetic CG-images. In this work, we run two experiments where observers use a brush-painting interface to directly mark image regions with noticeable/objectionable distortions in the presence/absence of a high-quality reference image, respectively. The collected data shows a relatively high correlation between the with-reference and no-reference observer markings. Also, our demanding per-pixel image-quality datasets reveal weaknesses of both simple (PSNR, MSE, sCIE-Lab) and advanced (SSIM, MS-SSIM, HDR-VDP-2) quality metrics. The most problematic are excessive sensitivity to brightness and contrast changes, the calibration for near visibility-threshold distortions, lack of discrimination between plausible/implausible illumination, and poor spatial localization of distortions for multi-scale metrics. We believe that our datasets have further potential in improving existing quality metrics, but also in analyzing the saliency of rendering distortions, and investigating visual equivalence given our with- and no-reference data.

DOI: 10.1145/2366145.2366166

Extracted Key Phrases

10 Figures and Tables

010203020132014201520162017
Citations per Year

61 Citations

Semantic Scholar estimates that this publication has 61 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Cadk2012NewMR, title={New measurements reveal weaknesses of image quality metrics in evaluating graphics artifacts}, author={Martin Cad{\'i}k and Robert Herzog and Rafal Mantiuk and Karol Myszkowski and Hans-Peter Seidel}, journal={ACM Trans. Graph.}, year={2012}, volume={31}, pages={147:1-147:10} }