On a bi-level colour device, only eight distinct colours (including black and white) are able to be represented. One common method of mapping image data to such a device is to use error diffusion techniques. These techniques diffuse the error from representing a particular pixel to adjacent unprocessed pixels, with the effect that locally the average pixel value closely approximates that of the...

The memory colour reproduction is an important factor in judging image quality of photographic images of real life scenes. As the most important memory colour category, skin tone was extensively studied for preferred colour reproduction in this research. The methodology to study skin colour preference was then applied to study the colour preference of two other important colour categories: gree...

This paper presents the computerised simulation of colour-blindness and proposes a colour enhancement technique to aid colour-blinded people to use Visual Display Units (VDU). With the red-green colour perception difficulties, the ISH model has been used to develop the algorithms. The simulator and colour enhancement have been tested by colour-blind people and compared to existing simulators fo...

This thesis presents a complete self-calibrating illumination intensity-invariant colour classification system. We extend a novel fuzzy colour processing technique called Fuzzy Colour Contrast Fusion (FCCF) by combining it with a Heuristicassisted Genetic Algorithm (HAGA) for automatic fine-tuning of colour descriptors. Furthermore, we have improved FCCF’s efficiency by processing colour channe...

The Coloroid Colour System, being elaborated between 1962 and 1980 at the Budapest University of Technology and Economics has been created mainly for architects and visual constructors constitutes a colour system of perceptions built on harmonic colour differences of perceived surface colours enlightened by daylight and sensed by an observer possessing normal colour vision, that well approximat...