The Visible Differences Predictor: applications to global illumination problems
Karol Myszkowski
The main goal of this Web page is to provide with more experimental results which are partially described in a manuscript entitled "The Visible Differences Predictor: applications to global illumination problems" by Karol Myszkowski (EGWR 1998). Also, the full-resolution stimuli images used in our experiments can be downloaded in a non-lossy image format. This makes possible repetition of our experiments using some different Visible Difference Predictors, or designing different experiments using our stimuli images. The organization of the experimental material presented at this Web page mostly follows that of the manuscript.

Abstract. In this study of global illumination computations, we investigate the applications of the perceptually-based Visual Difference Predictor (VDP) developed by Daly. First, we validate the performance of this predictor in shadow masking by texture and luminance contrast experiments. We also experiment with Contrast Sensitivity Functions (CSFs) derived from the results of various psychophysical experiments, various spatial frequency and orientation channel decomposition schemes, and contrast definitions, in order to check predictor integrity and sensitivity to differing models of visual mechanisms. We show applications of the VDP to monitor the perceived quality of the progressive radiosity and Monte Carlo solutions, and decide upon their stopping conditions. Also, based on the local error metric provided by the predictor we show some initial attempts to drive adaptive mesh subdivision in radiosity computations.

(A postscript version of this paper is available. Also, color figures can be downloaded.)

Daly's VDP model

VDP validation experiments

VDP integrity

VDP applications

ACM TOG paper