Computer graphics recently have began being used for visual environmental assessment or architectural designs. Displaying the sky as a background is indispensable in generating photorealistic images for such applications. In this paper, we propose a fast display method of the sky color by expressing the intensity distribution of the sky using basis functions, even if the sun position and/or the...

Most colour‐normal human observers have no difficulty to adjust a coloured light such that it appears neither red nor green, or such that it appears neither yellow nor blue. Moreover, it has been shown that these hue judgements are not significantly influenced by language or age and individual differences in colour sensitivity are not reflected in the unique‐hue settings. Here we ...

The contribution of colour opponent mechanisms to detection thresholds is investigated at different spatial frequencies by presenting monochromatic, sinusoidal gratings on a uniform white background. Colour opponent mechanisms, characterised by a triple peaked spectral sensitivity function, determine threshold at low spatial frequencies (below 1 c/deg) and their contribution flattens the Weber ...

Photonic crystals with tunability in the visible region are of great interest for controlling light diffraction. Mechanochromic photonic materials are periodically structured soft materials designed with a photonic stop-band that can be tuned by mechanical forces to reflect specific colours. Soft photonic materials with broad colour tunability and fast colour switching are invaluable for applic...

In this research we described the effective Hamiltonian theory and applied this theory to the calculation of current-current (Q1,2) and QCD penguin (Q3,…,6) c quark decay rates. We calculated the decay rates of semileptonic and hadronic of charm quark in the effective Hamiltonian theory. We investigated the decay rates of D meson decays according to Spectator Quark Model (SQM) for the calculati...

Lindahl, G. 2005. Colour characteristics of fresh pork. Doctor’s dissertation. ISSN 1652-6880, ISBN 91-576-7042-0 The objective of the present thesis was to obtain more fundamental understanding of the mechanisms for variations in colour and colour stability of fresh pork. The effects of breed and genotype, including Duroc, Hampshire (three RN alleles), Landrace and Yorkshire pigs, were studied...

Recently, methine dyes have attracted interest for their possible application in display devices [1, 2 ] . A liquid crystal display based on the ability of "guest"' pleochroic dyes to align parallel to the "host" liquid crystal was first described by Heilmeier and Zanoni [3 ] . Since then the basic properties of "guest-host" type liquid crystal display devices and the effects of various paramet...

Due to the proliferation of low-cost colour devices (digital colour cameras, scanners, printers etc.) during the last few years, colour calibration has become an important issue. Such devices should faithfully reproduce colour images, but experience shows they don’t. Among the main reasons, we note the diversity of acquisition, display and printing technologies which makes standardization diffi...

Previous work has shown that reaction times to find a target in displays that have been repeated are faster than those for displays that have never been seen before. This learning effect, termed "contextual cueing" (CC), has been shown using contexts such as the configuration of the distractors in the display and the background colour. However, it is not clear how these two contexts interact to...