The Purpose of these paper is to find out that Fluctuation is effective as a means to express personal impression on design of wallcovering. By using personal computer,visible image of wallcovering is inputted to a computer program as 'bmp'file,windows bitmap file format,for Fourier transform.The evaluation indexes such as "Map" ,"Fluctuation coefficient","Rest error", and "Linearity" are defined to display the analytical result .The result is shown by visible image and numerical value. Grain of stone and texture of fabric are given as examples to show how the characteristics of the image are reflected on the numerical values. As a result, we are now able to know how the characteristics of the images are reflected on the numerical value of the evaluation indexes.

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The purpose of this Paper is to point out that the fluctuation measurement is an effective means for differences of the impression people gain from various kinds of wall coverings.This paper follows result of the previous report part 3 in which the characteristic of space frequency of the visual images was analyzed and some physical indexes were proposed. As a result of the study on the correlation between physical value and psychological response, it was cleared that characteristic of power Spectrum with the space frequency is closely and related to the 4 factors extracted from the psychological evaluation; "Design" ,"Regularity" ,"Evaluation" , and"Texture".

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