著者

仲村 匡司 坂井 崇俊 増田 稔

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.51, no.4, pp.398-403, 2002-04-15

参考文献数

16

被引用文献数

1 4

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Visual characteristics of wood which influence visual hardness of it were studied. Thirty-four photographs of H-shaped wooden backs of chairs were prepared as specimens. Questionnaires regarding visual hardness and &ldquo;deluxe&rdquo; image of specimens were distributed to 32 subjects using the repeated equal-division method. Color values (<i>Y, x</i> and <i>y</i>) of specimens were measured by the colorimeter. Local-area gloss <i>G</i> and spatial ratio of contrasts <i>C</i> were calculated using digital image analyses. <i>G</i> was the index of the local-area glossiness (highlight), and <i>C</i> was the index of the noticeability of wood grain figures. Calculation procedures for both indices were newly developed in this paper. The single correlation coefficient between a visual &ldquo;hard&rdquo; image and <i>Y</i> (lightness of specimen) was -0.91, and that between <i>G</i> was 0.83. Using visual &ldquo;hardness&rdquo; as a criterion variable and <i>Y</i> and <i>G</i> as predictor variables, a multiple regression analysis was performed. The multiple correlation coefficient was 0.931, the ratio of contribution was 86.7% (significant level 1%). Furthermore <i>C</i> was added to the regression model, above values were 0.942 and 88.8%, respectively (significant level 1%).