Method for 3D gray-to-gray crosstalk uniformity measurement with high perceptual relevance

Abstract

Three-dimensional (3D) crosstalk is a critical perceptual factor that degrades the image quality and causes visual discomfort when using stereoscopic displays. Although many crosstalk characterization methods have been published, few of them consider human perception. Moreover, most of these methods were designed for discrete sample measurements and do not account for the way humans observe entire displays. The aim of this research was to measure the 3D gray-to-gray crosstalk and its uniformity in a way that correlates to human vision. Two perception experiments were performed: one for local crosstalk value perception and another for crosstalk map perception. The correlations between the perception data and the objective crosstalk values calculated using nine different equations were compared. Then the correlations between the perceptual crosstalk maps and the calculated crosstalk maps were analyzed with camera-captured luminance levels using three different equations. The study results demonstrate that the proposed crosstalk equation based on Stevens' law leads to a higher correlation with the perceived crosstalk for both a single sample measurement and the entire screen. It was also demonstrated that low gray levels in the intended channel lead to higher crosstalk values and decreased uniformity.

Measurement of crosstalk in stereoscopic display systems used for vision research

“…Under these circumstances, it is helpful to estimate the amount of crosstalk for luminance contrast relative to this background level. Measuring luminance for an eye (or shutter) viewing mean luminance while the luminance to the other eye is varied (see Figure 4 for examples) permits such an estimate (sometimes called the gray-to-gray crosstalk; see Chen et al, 2015). …”

“…There was wide variation in luminance crosstalk, from less than 0.1% to over 7%. We also report measures of contrast crosstalk (sometimes called gray-to-gray crosstalk; see Chen et al, 2015; Woods, 2012), which for some LCD-based systems could be negative. We now discuss possible explanations for this finding, and then consider the implications for various levels of crosstalk for different psychophysical binocular paradigms.…”

“…In this article, crosstalk was assessed for eight stereoscopic display systems using a photometer, in order to provide benchmark measurements. We also report a measurement of contrast (rather than luminance) crosstalk (sometimes called gray-to-gray crosstalk; see, e.g., Chen, Ye, Huang, & Chen, 2015), as well as the existence of negative crosstalk on some LCD-based systems, in which the polarity of the ghost image is reversed. We provide recommendations for best practices for a range of different binocular experimental paradigms.…”