Observers can generally make reliable judgments of surface color in natural scenes despite changes in an illuminant that is out of view. This ability has sometimes been attributed to observers' estimating the spectral properties of the illuminant in order to compensate for its effects. To test this hypothesis, two surface-color-matching experiments were performed with images of natural scenes o...

Objects appear to have much the same color under quite diverse illumination. This phenomenon, which is known as color constancy, can only be achieved by considering the color of surrounding surfaces. However, considering surrounding surfaces will yield errors if the chromaticity in such surfaces arises from the surface reflectance rather than from the illumination. Does the visual system treat ...

Most studies of surface color appearance have ignored 3-D illumination phenomena such as shadows and interreflections. These phenomena must affect surface color appearance to some extent, but without a model we cannot make claims about how great these effects really are. In this article, we introduce a simple model of how interreflections can affect color appearance. We consider a family of ide...

in this research,for taxonomic studies and identification of the fungi associated with the powdery mildew(oidium euonymi- japonici) of buxus trees (euonymus japonica), the infected leaves were collected during autumn and winter 2012-2013 in gorgan (golestan province -iran). the samples after washing and surface sterilizing, were cultured on pda medium(with boxwood extract).then based on availab...

OBJECTIVE The aim was to evaluate the color and surface roughness of nanoparticle (C1) and nanohybrid (C2) composites after immersion in distilled water, acai juice, grape juice and red wine and repolishing. MATERIALS AND METHODS After recording the initial surface roughness and color, the specimens were divided into four groups according to the storage solution. The specimens were reassessed...

The color of model tablets deepened and tablet gloss increased with increase in compression pressure regardless of colorant type. The possible reasons for these phenomena were examined. These observations could not be explained either by polymorphic transition of the colorant or by condensation of the colorant during compression. Instead, a change in surface roughness was assumed to be the most...

models of daylight illumination and hybrid reflectance, and predicts the color of objects b scene context. The second method shows that color can be nonparamet-rically " learned " th classification methods such under different Figure 1: Samples of objects in outdoor images, along with the variation of R G B color over 100 images. Top: two matte surfaces; Middle: camouflaged military vehicle; Bo...

Coded structured light is a fast and reliable technique to acquire the geometry of a measuring surface since the pattern codification might solve the correspondence problem in a single shot. Colored patterns reduce pattern segmentation complexity but their efficiency decreases in the presence of colored surfaces. We propose a color coded pattern which is automatically adapted depending on the c...

BACKGROUND Consumption of certain beverages may affect the esthetic and physical properties of the resin composite, thereby undermining the quality of restorations. AIM To analyze the effect of three beverages (cola, coffee, tea) on color stability and surface roughness of three different types of resin composites at various time intervals in vitro. MATERIALS AND METHODS Nano, microhybrid a...