The well-known simultaneous color contrast effect is traditionally explained in terms of visual color constancy mechanisms correcting for the confounding influence of ambient illumination on the retinal color signal. Recent research, however, suggests that the traditional gross quantitative laws of simultaneous color contrast, which are readily compatible with this functional explanation, shoul...

The degrees of pairs of terms applied to color sequences, such as natural-unnatural, have been investigated previously. Two terms, natural and complex (or unnatural), were described by Ohi & Kawasaki (1996), where after several terms were commonly used to describe the characteristics and associative meanings of colors (Sivik, 1997). In previous studies by this author, the various effects of tem...

The basic requisites for any steganography algorithm include imperceptibility, embedding capacity and robustness to communication attacks. To measure the quality of gray-scale or color image, the metric such as PSNR is widely used by researchers in steganography. However, for digital color image, there are many other options such as WPSNR, PSNRE, PSNRY, PSNR-HSR, CQM etc. In this paper, we have...

During the last decade, model based tracking of objects and its necessity in visual servoing and manipulation has been advocated in a number of systems [4], [7], [9], [12], [13], [14]. Most of these systems demonstrate robust performance for cases where either the background or the object are relatively uniform in color. In terms of manipulation, our basic interest is handling of everyday objec...

Although many indoor-outdoor image classification methods have been proposed in the literature, most of them have omitted comparison with basic methods to justify the need for complex feature extraction and classification procedures. In this paper we propose a relatively simple but highly accurate method for indoor-outdoor image classification, based on combination of carefully engineered MPEG-...

SYNOPSIS. The bright colored pigment cells of fishes and amphibians include xanthophores, erythrophores, and iridophores. Their ultrastructure and pigmentary composition are discussed. The role of the hypophysis in controlling both physiological and morphological changes of color in both groups is discussed. The nervous system may be involved in physiological responses of fish iridophores. The ...

this study aimed to examine the relationship between pigments and seed fall rate of iranian castor genotypes and genetic diversity, specifically 28 castor genotypes (27 native and 1 modified), a randomized complete block design with three replications was conducted in 2014 and 2015 at the research farm of islamic azad university in damghan, northern iran. during the growth period, the following...