Abstract

SA.08.05

Experimental studies on colour perception

Walter A., Schürer M., Brünner H., Langenbucher A.
Institut für medizinische Physik, Universität Erlangen/Nürnberg
Presenter: M. Schürer

Objective: The physiological measurements of colour perception are mostly restricted to evaluate defects of the human colour vision using vision charts or anomaloscopes. The purpose of the present study is to build-up a novel fully automated measuring setup to determine the points of colour discrimination. Applications are colorimetric measurements like chromatic adaptation or the effect of light luminance modification on colour discrimination.
Methods: The environment of colorimetric measurements especially the discrimination of two colour probes are defined in DIN 5033. It includes a monocular visual field test with an angular a size of 2° and 10° (norm observer). A minimum light luminance level of the probe and surrounding of 30 cd/m² assures photopic vision. Constant luminance levels of the probe and the surrounding yield accurate results for the human colour discrimination. The two colour probes are designed without an edge in between.
Results: The two colour probes of this novel automatic measurement system are independently adjustable and generated by an additive mixing. With the selection of 5 different light sources which can be modulated independently a wide range of the colour space for the probes and light luminescence could be addressed. A chromatic adaptation of the colour probe could be avoided due to a short observation time of 3 seconds. LED sources used in our setup are adjustable in a wider range than xenon lamps and allow automation of the measurement sequence. Due to the broad spectrum of the presented colours the results can be transferred to body colour. A surrounding field of 42° is realised by an Ulbricht sphere. Psychological effects on the results were minimized by the convergence method.
Conclusions: The measurement system allows a quantitative determination of colour discriminance levels and can be flexibly used for addressing a wide range of scientific and clinical questions. A precise calibration is crucial for getting reproducible results.

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