Colorimetric identification of porcelain by material type

Abstract

Colorimetric identification of porcelain articles by material type is reduced to finding the classification functions which are obtained on a training sample and relate the color coordinates with the form of porcelain according to the material type. These functions must be regarded as a statistical model for determining whether or not new porcelain samples belong to one of the porcelain types according to the material.

Evolution of phase morphology in dispersed clay systems under the microwave irradiation

“…The method of colorimetric gradation is very effective in computer processing of optical images of clay powders surfaces [6]. In modern colorimetry, several color models of different target orientation are operating [7], however, for the analysis of structural changes in aluminosilicates, the XYZ and L*a*b* models are the most convenient [8]. Recently, information on the periodicity and nature of the distribution of structural elements in the material was obtained using the wavelet analysis.…”

“…Variations in the parameters a* and b* confirmed the differences in the evolution of structural transformations occurring in a dispersed clay system under microwave treatment in different media. The most reliable [8] indicator of the structural changes presence is the color difference ΔE* ab . If for sample A we take ΔE* ab =0, then for the sample of lot B ΔE* ab =4.90.…”

“…3 shows wavelet spectrograms carrying information on the distribution of mesostructural elements (particles) on the surface of powders. The abscissa is the wavelet (3)(4)(5)(6)(7) represents the distribution of larger elements; the upper part (7)(8)(9)(10)(11) gives a generalized picture of the surface. The correlation between the wavelet and the point profile in its vicinity is determined by the color of the corresponding region of the wavelet spectrogram [16]: white is the maximum and dark blue is the minimum of coincidences.…”