“Color space” refers to a specific system of coordinates that allows us to describe a particular color of light. In this article we discuss the concept of the color of light and the concept of a “color model”—which if precisely specified is today most often described as a “color space”. We then describe in some detail a number of specific color spaces used in a wide range of fields. TABLE OF CO...

A space X is a D-space if whenever one is given a neighborhood N(x) of x for each x ∈ X, then there is a closed discrete subset D of X such that {N(x) : x ∈ D} covers X. It is a decades-old open question whether some of the standard covering properties, such as Lindelöf or paracompact, imply D . This remains unsettled, yet there has been a considerable amount of interesting recent work on D-spa...

Color space transformation is the process of converting color from one space to the other type of color space, which plays a very important role in image acquisition, display and color information transfer. Though CMYK space is applied to express color when using printer or phototypesetter, editing correction in CMYK color space may cause color loss and lower the speed of computer operation. Th...

Computer based methods for facial age estimation can be improved by incorporating experimental findings from human psychophysics. Moreover, the latter can be used in creating systems that are not necessarily more accurate in age estimation, but strongly resemble human age estimations. In this paper we investigate the perceptual hypothesis that contrast is a useful cue for estimating age from fa...

A cylindrical coordinate colour space (lightness, saturation/chroma, hue) is derived from an opponent colour space in the RGB space. It is shown how cylindrical coordinate colour models widely used in the literature are related to or can be reduced to the derived model, thereby contributing to creating a unified cylindrical coordinate colour model. In particular, the widely used saturation expr...

In this paper we proposed a new method, in order to extract the shadow area, using the homomorphic system for more emphasizing on illumination and reflection components separately. Also we use Value component of HSV color space as darkness/lightness of a color, which tends to work better for any images. Furthermore, the presented experimental results which are obtained for shadow identification...

206 words Text (excluding references): 3743 words References: 18 entries Figures: 3 Tables: 1 * Manuscript

A mathematically simple transformation from the Judd (1951) modified CIE space into the space spanned by the cones is derived. The transformation is based on geometrical intuition (Pitt 1945). Light fluxes that initiate vision are transmitted into electrical signals by the photoreceptors. In day light these are the retinal cones. Most humans have three types of cones with spectral sensitivities...

detecting faces in cluttered backgrounds and real world has remained as an unsolved problem yet. in this paper, by using composition of some kind of independent features and one of the most common appearance based approaches, and multilayered perceptron (mlp) neural networks, not only some questions have been answered, but also the designed system achieved better performance rather than the pre...