A New Method for Optical Evaluation of Texture.

概要

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A goniophotometer has ordinarily used to evaluate color and texture of subject. However, this method gives vast effort and a long time to measure, since incident and reflective angles must be changed in many a time. Moreover, since only one point of subject can be measured, it is actually impossible to obtain two-dimensional information which are needed to evaluate texture. To overcome these disadvantages, the new and unique method to evaluate color and texture of subject simultaneously is proposed. By recording images with multiple optical filters and a CCD camera, reverse calculating of obtained strength of reflective light can realize to measure spectral reflectance whole over the subject's surface simultaneously. A new device has been constructed based on our theory and tested on foundation painted on a sphere. The device could measure spectral reflectance at over 16000 points on the subject's surface at once. Moreover, changing high compositions of power spectrum given in specific wavelength using FFT could evaluate texture of subject. Clearly, the proposed method offers significant advantages over conventional methods.
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