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Memory Colour based Assessment of the Colour Quality of White Light Sources

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Abstract:

This paper shortly describes the development, method and validation of a memory colour based metric for the assessment of the colour quality of white light sources. The basic assumption of the metric is that the colour quality of a light source increases as object colours closely resemble what is expected. The similarity with an object's memory colour is described by a set of similarity functions derived by modelling the observer ratings of the colour appearance of a set of real familiar objects. The ratings were obtained in a series of visual experiments in which familiar objects were presented in many different colours to a group of observers. The observers were asked to rate the presented object colour with reference to what they thought the object look like in reality. Based on the psychophysical data of an experiment conducted by the authors, as well as visual data from several visual studies described in literature the memory colour metric was validated, with high statistical significance (p<0.0001), as a metric with a high correlation (r=0.88) with the visual appreciation of light sources. A comparison with 12 other metrics showed it was significantly better at assessing the colour quality of white light sources in terms of visual appreciation.

Document Type: Research Article

Publication date: January 1, 2011

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, and a vibrant interactive papers session. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper presentation.
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