In the retina of trichromatic primates, chromatic information is encoded in an opponent fashion and transmitted to the lateral geniculate nucleus (LGN) and visual cortex via parallel pathways. Chromatic selectivities of neurons in the LGN form two separate clusters, corresponding to two classes of cone opponency. In the visual cortex, however, the chromatic selectivities are more distributed, w...

A channel transformation based on opponent-color theory of the color vision models is applied to optical pattern recognition so that the conventional red, green, and blue (RGB) channels are transformed into bright–dark, red–green, and yellow–blue (ATD) channels. Matched filtering and correlation are performed over the new components of the target and the scene in the ATD system. The proposed tr...

THE RECEPTORS AND NERVE CELLS that make up the visual pathway must convey and interpret information on both the form and the color of retinal images. In higher mammals little is known about the degree to which nerve cells are specialized for handling these types of information. In a visual stimulus the importance of spatial attributes, and especially of dark-light contours, first became obvious...

The post-receptoral mechanisms that mediate detection of stimuli in the (DL/L, DM/M) plane of color space were characterized using noise masking. Chromatic masking noises of different chromaticities and spatial configurations were used, and threshold contours for the detection of Gaussian and Gabor tests were measured. The results do not show masking that is narrowly-selective for the chromatic...

In this paper we present a new efficient watermarking scheme for images. The basic idea of our method is to alter the colors of the given image in a suitable but imperceptible way. This is accomplished by moving the coordinates of each color in the color opponency space. The scheme is shown to be robust against a large class of image manipulations. The robustness of the scheme is also theoretic...

bstract. We develop real-time, low-complexity image classificaion algorithms suitable for a copy mode selector embedded in a ow-end copier. The algorithms classify scanned images repreented in RGB or in an opponent color space. Classes are the eight ombinations of mono/color and text/mix/picture/photo. Classificaion is 30–98% accurate with misclassifications tending to be beign. The algorithms ...

We examined the role of color in the processing of motion of a luminance-varying pattern by alternating the color of a moving pattern and measuring the luminance contrast required for accurate discrimination of the motion direction. We report that the contrast threshold for perceiving the direction of motion of luminance-varying patterns is greatly elevated when the mean chromaticity of the mov...

Understanding why spectra that are physically the same appear different in different contexts (color contrast), whereas spectra that are physically different appear similar (color constancy) presents a major challenge in vision research. Here, we show that the responses of biologically inspired neural networks evolved on the basis of accumulated experience with spectral stimuli automatically ge...

Although color preference is an important aspect of human behavior, little is known about why people like some colors more than others. In this paper we probe this issue both theoretically and empirically. First, we discuss Hurlbert and Ling’s (2007) cone-contrast theory, which posits a physiological explanation based on opponent cone outputs and gender differences. We then present an ecologica...