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Perceptual transparency was measured in two experiments by using simulations of illuminated surfaces presented on a CRT monitor. In a two-alternative forced-choice paradigm, observers viewed two simulated Mondrians in temporal sequence. In one sequence the Mondrian was simulated to be partially covered by a transparent filter; in the other sequence the(More)
This study concerns the roles of absolute and relative orientation in determining detectability of a line-element target in a background field of uniformly oriented line elements. Target detectability was determined as a function of background-field orientation, sampled at 5 deg intervals, for three levels of orientation contrast--the difference between(More)
OBJECTIVES To review current knowledge on the definition of tooth whiteness and its application within dentistry, together with the measured range of tooth colours. METHODS 'Medline' and 'ISI Web of Sciences' databases were searched electronically with key words tooth, teeth, colour, colour, white and whiteness. CONCLUSIONS The application of colour(More)
OBJECTIVE It has been clinically observed that color differences between teeth and some restorations are smaller than if they are viewed in isolation. The objective was to evaluate in vitro the influence of restoration size, initial color difference and translucency on blending effect (BE) of resin composites. METHODS Specimens were made of two composites(More)
One approach to camera characterization is to attempt to recover the spectral properties of the surfaces in a scene and then compute the tristimulus values from these estimated reflectances. This paper addresses the question of whether such spectral-based characterization methods can outperform traditional characterization methods. In this paper we have(More)
INTRODUCTION There is evidence to suggest that Ledermix, placed as an intervisit root canal dressing, might improve periodontal healing after replantation of avulsed teeth. As a part of a multicenter randomized controlled trial, we aimed to compare the effect of 2 root canal medicaments, Ledermix and Ultracal XS, on the discoloration of replanted teeth. (More)
We investigate methods for the recovery of reflectance spectra from the responses of trichromatic camera systems and the application of these methods to the problem of camera characterization. The recovery of reflectance from colorimetric data is an ill-posed problem, and a unique solution requires additional constraints. We introduce a novel method for(More)
The color characterization of digital cameras often requires the use of standard charts containing a fixed number of color samples. The exact choice of such characterization charts—how many (and which) known samples to include—is known to affect characterization performance. This study describes methods to select optimum color samples from a set of 1269(More)