Discrimination of objects Based on Surface Reflectance Characteristics

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1. A color reflection model for inhomogeneous objectsThe standard reflection model for inhomogeneous materials assumes that light is reflected by two independent mechanisms. We have developed a method for testing the standard reflection model. Next a computational method has been proposed for estimating the illuminant spectral distribution from observed spectra reflected from two object surfaces. The validity of the model and the reliability of the method are confirmed on experiments using some inhomogeneous objects of plastics.2. Color reflection models for a variety of objectsColor reflection models have been proposed for a variety of objects based on the analysis of the reflected light spectra from the object-surfaces and their surface spectral reflectances. We have presented a procedure for testing the adequacy of the standard reflection model on real objects in our everyday lives. The test results shows that the standard model is adequate for many materials, but inadequate for metals composed of only specular reflection, and for some of papers and cloths. By a detailed analysis of the surface reflectance of these materials, it has been shown that the light reflection can be expressed in an extended dichromatic reflection model.3. Surface identification using the standard reflection modelMany surfaces of objects are assumed to be composed of inhomogeneous materials, whose surface spectral reflectance function is described as the sum of a specular reflectance and a diffuse reflectance. The specular component is used to estimate the spectral power distribution of the illuminant, while the diffuse component is used as the principal indication of the surface identity. In real measurement of a scene, a number of the surface-spectral reflectances observed from spatially different locations depends on the different body components. Here we have developed a method for recovering the diffuse reflectance function of each surface in two steps.