Color classification of veal carcasses: Past, present, and future

Behind every strong man there is a strong background: The effect of dynamic background textures on facial evaluation (poster)

Emotional effects of dynamic textures

This study explores the effects of various spatiotemporal dynamic texture characteristics on human emotions. The emotional experience of auditory (eg, music) and haptic repetitive patterns has been studied extensively. In contrast, the emotional experience of visual dynamic textures is still largely unknown, despite their natural ubiquity and...

Color classification of veal carcasses: Past, present and future

In The Netherlands, veal carcasses are classified on color, conformation and fatness. In the past 20 years, major efforts have been put into the development of a reliable color classification system. Initially, the color of the musculus rectus abdominis was visually matched to a 10-point scale. Later on, the visual classification was replaced by...

The perception of static colored noise: Detection and masking described by CIE94

We present psychophysical data on the perception of static colored noise. In our experiments, we use the CIE94 color difference formula to quantify the noise strength and for describing our threshold data. In Experiment 1 we measure the visual detection thresholds for fixed pattern noise on a uniform background color. The noise was present in...

Brightness and darkness as perceptual dimensions

A common-sense assumption concerning visual perception states that brightness and darkness cannot coexist at a given spatial location. One corollary of this assumption is that achromatic colors, or perceived grey shades, are contained in a one-dimensional (1-D) space varying from bright to dark. The results of many previous psychophysical...

Do cortical neurons process luminance or contrast to encode surface properties?

Dynamic simulation of color blindness for studying color vision requirements in practice

We report on a dynamic simulation of defective color vision. Using an RGB video camera connected to a PC or laptop, the captured and displayed RGB colors are translated by our software into modified RGB values that simulate the color appearance of a person with a color deficiency. Usually, the simulation of deficient color vision is restricted...

Edge integration and the perception of brightness and darkness

How do induced brightness and darkness signals from local and remote surfaces interact to determine the final achromatic color percept of a target surface? An emerging theory of achromatic color perception posits that brightness and darkness percepts are computed by weighting and summing the induction signals generated at edges in a scene. This...

Separate processing of chromatic and achromatic contrast in color constancy

In a preceding study we measured human color constancy in experimental conditions in which simulated illuminants and surface colors were varied in the chromatic domain only. Both illumination level and sample re.ectance were fixed in that study. In the present study we focus on the achromatic dimension, both with respect to luminance contrast ...

Identification in static luminance and color noise

If images from multiple sources (e.g. from the different bands of a multi-band sensor) are displayed in color, Signal and Noise may appear as luminance and color differences in the image. As a consequence, the perception of color differences may be important for Target Acquisition performance with fused imagery. Luminance and color can be...

The CIE94 colour difference formula for describing visual detection thresholds in static noise

The parametric factors kL, kC and kH that scale the CIELAB components kL*, kC* and kH* in the CIE94 colour difference formula are unity under reference conditions. When the conditions are changed, the scaling factors may be adapted to account for the influence of specific experimental conditions on perceived colour differences. We determined...

A new universal colour image fidelity metric

We extend a recently introduced universal grayscale image quality index to a newly developed perceptually decorrelated colour space. The resulting colour image fidelity metric quantifies the distortion of a processed colour image relative to its original version. We evaluated the new colour image fidelity metric through observer experiments in...

A universal color image quality metric

We extend a recently introduced universal grayscale image quality index to a newly developed perceptually decorrelated color space. The resulting color image quality index quantifies the distortion of a processed color image relative to its original version. We evaluated the new color image quality metric through observer experiments in which...

An example of applied colour vision research: The conspicuity of airplane colour

This paper describes the application of the combined knowledge on colorimetry, colour imaging (visualization) and colour perception in an aviation related research project. It involves the optimisation of the conspicuity of the colour scheme of an airplane, with the purpose of minimizing the changes of a mid-air collision. Subjects determined...

Quantitative studies of color constancy