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Incident photometry: specifying stimuli for vision and light detectors

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Abstract

Photometry has traditionally been conceptualized primarily in terms of measuring light sources. However, all units of photometry can also refer to measurements of light as it is received. A description of how to measure incident light is developed from the basis that light forming an image is just the reverse of light emitted from a source. The incident approach to photometry reveals how to derive luminance from a measure of illuminance and how to correctly calculate the illumination of an image. It is further recommended that photometric specification of incident light be accompanied by a description of its effectiveness relative to the receiver threshold.

© 1983 Optical Society of America

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