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In this research, alternative possibility of real space by whole sky image was examined by comparing with psychological evaluation results of real space, photograph and whole sky image. The whole sky image has a feature that images the whole space of 360 degrees horizontally and vertically from the shooting point, and it is becoming popular way to represent indoor space such as real estate properties. Specifically, the statistical test result such as correlation coefficient and t-test, and the average evaluation score profiles were compared in order to grasp the characteristics of each experiment from individual evaluation, image evaluation by SD method, and comprehensive evaluation. In addition, the evaluation structure based on the factor analysis result and determinants of satisfaction by multiple regression analysis were studied. Following is the knowledge gained from this study. · From the results of individual evaluation, image evaluation, and comprehensive evaluation, it is found that the evaluation criteria is similar between the real space and the whole sky image, especially the evaluation items such as the physical quantities in the vertical direction, the distribution of brightness and color tone over the entire space, the arrangement configuration of furniture and miscellaneous goods, and the space shape. Also, since the whole space can be grasped seamlessly, the results of psychological evaluation with whole sky image is closer to the one with real space compared with the one with photograph. · Because the field of view is limited in photograph, it is impossible to grasp the part that is not captured, the luminance difference in the photograph becomes smaller than real space and whole sky image, and brightness and color tone are regarded as a similar element. In addition, since photograph presented in two directions as a pair, it was confirmed that when the difference between them is remarkable, it is difficult to be felt as one space. From these characteristics, it was suggested that photograph is evaluated based on individual factors such as furniture and miscellaneous goods aspects. · Since the viewpoints of evaluation are similar in real space and whole sky image, the results of evaluation structures in factor analysis and determinants for image evaluation and overall satisfaction in multiple regression analysis are closer to the real space than photograph. · In the real space, there was a possibility that people grasp the space including the surroundings. Therefore, it was suggested that the influence of the outside of the evaluation space cannot be reproduced in photograph and whole sky image. From the above results, it is confirmed that the whole sky image can be substituted in real space, since it is possible to obtain a result close to the psychological evaluation of the real space than the conventional photograph. However, characteristic distortion of whole sky image may influence the evaluation on the extent of the space.
Akiyama et al. (Mon,) studied this question.