Nasar and Hong (1999) looked at the role of sign obtrusiveness and complexity in the perception and evaluation of urban signscapes. This image shows a set of physical features of retail sign scenes. Nineteen color photographs were used for the study. For more information about the research, refer the reference.
Nasar, J. L. & Hong, X. D. (1999). Visual preferences in urban signscapes. Environment and Behavior, 31(5), 671-691.