In the study of correlation between images and physical characteristics of various interior wall materials, it became necessary to numerize wood grain patterns and other patterns. With consideration of mechanism of seeing, especially mechanism of flicker, pattern numerization formulae were developed as follows; a=4a0/c (1), a0=1/2θ0∫θ0-θ0|Dθ-Dav|dθ (2), Dθ=1/A∫A|Pθ-P0|dA (3), Dav=1/2θ∫θ0-θ0Dθdθ (4), where A: area of pattern P0, c: pattern contrast.The relation between flicker and pattern value a or a0 is formulated as follows; f=abc (8) or f=a0b (9), where b: coefficient of effect of visual angle.By using various patterns generated by computers, the correlation between flicker image and the pattern value was ascertained. The pattern value is not only a good index of flicker but also a good index of regularity in patterns. Therefore, the relation between the pattern value and images of“gorgeousness”and“agreeability”was investigated with various interior wall panels (which include decorative veneer and printed paper overlayed plywood). As the result, it became clear that there exists a considerable correlation between the pattern value and the images.