| 摘要 |
A light box ( 10 ) with a viewing aperture contains sources of illumination ( 22, 28 ) which can be adjusted and set to simulate different lighting situations and conditions. An observable image on a trolley ( 40 ) is movable towards and away from the observer ( 14 ) and also transversely to the line of sight of the observer. Movement is effected by stepping motors ( 36 and 38 ). Measurements are made of the response of the observer to movement of the image consequent on changes in the parameters affecting the observer's perception of the image. A comparative assessment can thus be made of the effect of changing the illumination.
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