Tsz Lock Vien Cheung

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We investigate methods for the recovery of reflectance spectra from the responses of trichromatic camera systems and the application of these methods to the problem of camera characterization. The recovery of reflectance from colorimetric data is an ill-posed problem, and a unique solution requires additional constraints. We introduce a novel method for(More)
A number of different methods exist for the color characterization of imaging devices such as digital camera systems. In this study, the use of high-order polynomials and artificial neural networks for color camera characterization are compared and contrasted. A quantitative evaluation of their performance is determined for a typical commercial camera(More)
There have been many attempts to answer the question of how many distinct colors there are, with widely varying answers. Here we present an analysis of what it would take to arrive at a reliable answer and show how currently available models fail to make predictions under the wide range of conditions that needs to be considered. Gamut volumes are reported(More)
This study is a preliminary investigation towards the design of effective colour spaces and colour tools to allow users to quickly and accurately select a given colour in a digital-display environment. It has been shown that many non-expert users find the RGB colour space to be non-intuitive. The choice of colour space on various visual tasks has also been(More)
Many color digital camera systems exhibit a non-linearity between the input intensity and the output response of the color channels. Although the sensor (CCD) material responds to light intensity in a linear way a non-linearity is often added by the camera manufacturer. Recent research 1 has highlighted that in order to be able to estimate this(More)
Two subjects, protanomalous and deuteranomalous, performed the Farnsworth-Munsell 100-hue test with and without prescribed ColorView spectacle aids under simulated D65 lighting. Errors were greater with aids than without. Using spectral measurements of test reflectance, aid transmittance and lighting, chromaticities of the 100-hue caps were calculated with(More)
The use of large displays for purposes of colour communication is becoming increasingly popular and the need for high-fidelity reproduction of appearance is becoming even more demanding. In this work, the colour appearance of the ColorChecker chart was matched on a large liquid crystal display (LCD) and a comparison between the physical colours and the(More)