Many standard computer vision algorithms depend upon the solution of Poisson equations, retinex lightness computation being one such algorithm. Using lightness as an example, we show how it can be computed on a varying resolution sensor so long as the sensor architecture is based on a conformal mapping. We develop the varying resolution lightness algorithm by the well known technique of using a...

A new whitening cosmetic essence, 'Concentre anti-tache nuit'(CAN) (Parfums Christian Dior), which contained 3% magnesium 1-ascorbyl 2-phosphate, vitamin A, and an antisense compound(DNA Na), was evaluated against solar simulated radiation-induced delayed tanning(DT) in the unexposed upper arm skin of 12 healthy Japanese females, aged 20 to 55 years. Whitening effect was estimated by observatio...

Although lightness perception is clearly influenced by contextual factors, it is not known whether knowledge about the reflectance of specific objects also affects their lightness. Recent research by O. H. MacLin and R. Malpass (2003) suggests that subjects label Black faces as darker than White faces, so in the current experiments, an adjustment methodology was used to test the degree to which...

When the illumination of a visual scene changes, the quantity of light reflected from objects is altered. Despite this, the perceived lightness of the objects generally remains constant. This perceptual lightness constancy is thought to be important behaviorally for object recognition. Here we show that interactions from outside the classical receptive fields of neurons in primary visual cortex...

There is a large literature characterizing human perception of the lightness and color of matte surfaces arranged in coplanar arrays. In the past ten years researchers have begun to examine perception of lightness and color using wider ranges of stimuli intended to better approximate the conditions of everyday viewing. One emerging line of research concerns perception of lightness and color in ...

The purpose of this study was to compare two in-office bleaching methods with respect to tooth color change and level of hydrogen peroxide penetration into the pulp cavity and to evaluate relationships between penetration level and color change. Eighty extracted canines were exposed to two different bleaching regimens (conventional vs sealed bleaching technique). After exposure to 38% hydrogen ...

The perceptual gloss space defined in Pellacini et al. [9] could be used for quality control applications to bring similar benefits as seen in color with the use of CIELAB. However, a distance metric to relate all the dimensions in the space does not exist, and the space was only validated with the materials used to define the space. The current space’s distance metric does not allow relating d...

We compared how contrast adaptation influences three alternative measures of luminous efficiency. Subjects judged the lightness, the flicker, or the motion of chromatic sine-wave gratings. Adaptation to gratings with correlated luminance and chromatic contrast strongly biases lightness matches and moderately biases minimum-motion settings for gratings that are counterphased at 1 Hz, but it has ...

Experiments were performed to test a set of general-purpose gamut-mapping functions. These gamut-mapping algorithms utilized contrast-preserving scaling functions. These algorithms were tested against the GCUSP gamut-mapping algorithm proposed by Morovic and Luo, which was shown to have very good "universal" gamut-mapping characteristics. The results of these experiments showed that vast improv...