OBJECTIVES To review current status of hand held systems for tooth color matching in vivo and corresponding research. SOURCES "Medline" database from 1981 to 2010 were searched electronically with key words tooth, teeth, color and dentistry. CONCLUSION Spectrophotometers, colorimeters and imaging systems are useful and relevant tools for tooth color measurement and analysis, and for quality...

This study investigated appropriate methodologies for displaying hyperspectral imagery based on knowledge of human color vision as applied to Hyperion and AVIRIS data. Principal Component Analysis (PCA) and Independent Component Analysis (ICA) were used to reduce the data dimensionality in order to make the data more amenable to visualization in three-dimensional color space. In addition, these...

In this work a study of multispectral tools in color measurement of irises, prostheses and cosmetic colored contact lenses is performed. With the statistical analysis of CIELa*b* values, the CIEDE2000 color differences and color gamuts, the samples are classified in three major groups: brown, blue and green. In the same way, the irises color reproduction made by prostheses and contact lenses is...

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In this paper we present two approaches to highlight removal in color images. The first approach is based on a global analysis of a single color image. Threedimensional color descriptors are transformed to a pair of two-dimensional descriptors. The second approach is based on a local analysis of three color images. The images are taken in analogy to photometric stereo tasks. For every surface p...

The spatial distributions of melanin and hemoglobin in human skin are separated by independent-component analysis of a skin color image. The analysis is based on the skin color model with three assumptions: (1) Spatial variation of color in the skin is caused by two pigments, melanin and hemoglobin; (2) the quantities of the two pigments are mutually independent spatially; and (3) linearity hol...

In this paper we study some of the characteristics of the art painting image color semantics. We analyze the color features of different artists and art movements. The analysis includes exploration of hue, saturation and luminance. We also use quartile’s analysis to obtain the distribution of the dispersion of defined groups of paintings and measure the degree of purity for these groups. A spec...

introdouction: according to the importance of enamel discoloration and controversy regarding the effect of different orthodontic bonding materials on tooth discoloration, the aim of this study was to determine enamel discoloration following orthodontic brackets using different bonding materials. materials and methods: this in-vitro study, 30 recently extracted human premolars with intact enamel...