Pattern cohesiveness around isoluminance

Abstract

One of the peculiar phenomena occurring in two color pictures is a severe loss of cohesiveness when figure(s) and ground become isoluminous, whereas when both luminance and color differences exist between figures and background grouping of similarly colored parts is just a very dominating effect. In this paper we will present a quantitative method to measure this effect quantitatively. In a four-alternative-forced choice procedure pictures, disturbed by noise are presented. We will also discuss the possibility to use this method for measuring combined color and brightness differences.