Color appearance rating of familiar real objects under immersive viewing conditions

Abstract

With the concept of memory colors being considered to play a crucial role for many imaging and lighting applications, the questions how people assess the color appearance of familiar objects and what kind of fundamental characteristics can be derived from these assessments have extensively been studied in the past. However, all of the previous studies, the authors of this article are aware of, lack in realistic viewing and adaptation conditions. In the attempt of overcoming these deficiencies, a new experiment investigating the impact of long‐term memory on the color appearance ratings of 12 familiar test objects was performed. The pooled observer data were modeled in CIECAM02 color space using bivariate Gaussian functions whose centroids define the corresponding memory color centers for each test object. Comparisons with previous results obtained by Smet et al. revealed no significant differences in the reported memory color centers, but showed distinct deviations in the covariance matrices defining the shape of the fitted distribution functions. It is supposed that this new set of functions will lead to significantly different results when being used for the construction of an updated memory‐based color quality metric.

Impact of the adapted white point and the cultural background on memory color assessments

“…For the current article, two different CCTs of 3200 K and 5600 K were adopted. While the latter CCT was chosen for being able to compare the current results directly to those reported by Smet et al 9,14 (see Babilon and Khanh 35 for this comparison), the former represents the typical bias point of tungsten halogen fixtures used for theater and film productions as well as for lighting applications in the shopping and retail industry, that is, in fields of application where the aspirations of providing excellent light sources for high‐quality lighting are traditionally strongly pronounced 39…”

“…Based on the discussions of the previous section, a new experimental approach was developed by the authors and has been presented recently 35 . As stated in the introduction of this article, it can be considered as an extension of previous studies, in particular of those conducted by Sanders 5 and Smet et al, 9 to immersive and realistic viewing and adaptation conditions.…”

“…In the following, a brief description of the experimental setup will be given. For further details including additional image representations, the interested reader is referred to the original paper 35 …”

“…Hence, bivariate Gaussian fitting was applied in the following to model for each test object the corresponding observer rating data of each cultural observer group as obtained for the two different adaptation conditions. In each case, the Gaussian fit functions were slightly modified in order to account for observer variability and observers not using the entire rating scale (cf Smet et al 9 and Babilon and Khanh 35 ). This eventually results in four different sets of Gaussian fit functions describing for each of the two different cultural observer groups the prototypical memory color representations of the 12 familiar test objects assessed under both adaptation conditions at 3200 K and 5600 K, respectively.…”

Pattern retrieval of yarn‐dyed plaid fabric based on modified interactive genetic algorithm

“…The appearance of yarn‐dyed plaid fabric is ever‐changing with different layouts of color yarns and intertexture regularities. Consumer's perceptual modality results from the color appearance, 4 intertexture regularity, fabric weave and so on. It is extremely difficult to bridge the semantic gap between the design elements and the appearance for pattern retrieval.…”