2016 Volume 15 Issue 3 Pages 303-311
Recently, the demand for printed wood grain has been growing. The elements of wood grain of natural wood and printed wood grain are different. These differences result in the differences in characteristics of their corresponding spatial frequencies, and would influence the identification of natural and printed wood grain. In our study, we analyzed the spatial frequency of wood samples. Results showed that a more noticeable the difference in the samples was seen in the high spatial frequency region. We also visually evaluated the discriminability between natural and printed wood grain for various viewing distances. The results demonstrated that it was difficult to distinguish between natural and printed wood grain at long distances, whereas, it was easy at short distances. This suggests that the differences in the high spatial frequency and the presence or absence of half tone has an effect on the distinguishability in natural and printed wood grain samples.