Many luminance measuring tasks require a luminance distribution of the total viewing field. The approach of imageresolving
luminance measurement, which could benefit from the continual development of position-resolving radiation
detectors, represents a simplification of such measuring tasks.
Luminance measure cameras already exist which are specially manufactured for measuring tasks with very high
requirements. Due to high-precision solutions these cameras are very expensive and are not commercially viable for
many image-resolving measuring tasks. Therefore, it is desirable to measure luminance with digital still cameras which
are freely available at reasonable prices.
This paper presents a method for the usage of digital still cameras as luminance meters independent of the exposure
settings. A calibration of the camera is performed with the help of an OECF (opto-electronic conversion function)
measurement and the luminance is calculated with the camera's digital RGB output values. The test method and
computation of the luminance value irrespective of exposure variations is described. The error sources which influence
the result of the luminance measurement are also discussed.
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