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Proceedings Paper

Minimum Colour Differences Required To Recognise Small Objects On A Colour CRT
Author(s): Peter L. Phillips
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Paper Abstract

Data is required to assist in the assessment, evaluation and optimisation of colour and other displays for both military and general use. A general aim is to develop a mathematical technique to aid optimisation and reduce the amount of expensive hardware development and trials necessary when introducing new displays. The present standards and methods available for evaluating colour differences are known not to apply to the perception of typical objects on a display. Data is required for irregular objects viewed at small angular subtense ((1°) and relating the recognition of form rather than colour matching. Therefore laboratory experiments have been carried out using a computer controlled CRT to measure the threshold colour difference that an observer requires between object and background so that he can discriminate a variety of similar objects. Measurements are included for a variety of background and object colourings. The results are presented in the CIE colorimetric system similar to current standards used by the display engineer. Apart from the characteristic small field tritanopia, the results show that larger colour differences are required for object recognition than those assumed from conventional colour discrimination data. A simple relationship to account for object size and background colour is suggested to aid visual performance assessments and modelling.

Paper Details

Date Published: 13 May 1985
PDF: 15 pages
Proc. SPIE 0526, Advances in Display Technology V, (13 May 1985); doi: 10.1117/12.946373
Show Author Affiliations
Peter L. Phillips, Sowerby Research Centre (England)

Published in SPIE Proceedings Vol. 0526:
Advances in Display Technology V
Elliott Schlam, Editor(s)

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