Source modeling is one of the key elements that enables software simulations to predict the output of an illumination system. A successful method to model a source is to use measured spatial luminance distributions over a range of view angles to synthesize rays that are then used in a Monte Carlo illumination simulation. The measurements are typically performed using a camera at numerous discrete view angles. Important issues arise when synthesizing rays at angles between the measured angles, especially when the source being measured incorporates optical elements such as a reflector.
Color and luminance uniformity testing of displays is often limited to fewer than ten measurements points on the display surface due to the length of time necessary to make a single point measurement. A CCD-based digital imaging tristimulus colorimeter has been developed which is capable of measuring luminance and chromaticity coordinates at over one million spatial locations in several seconds. The Four-Color Method of colorimeter calibration, recently proposed by NIST, has been employed and found to be superior to single point calibration using Illuminant A. Color and luminance uniformity of a CRT and LCD display were measured using the new digital imaging tristimulus colorimeter and a diode array spectrometer. The data show that chromaticity coordinate and luminance measurements using the CCD-based imaging tristimulus colorimeter compare favorably with the point measurements obtained using a diode array spectrometer over the color gamut of a CRT and LCD display.
Conference Committee Involvement (1)
Nonimaging Optics and Efficient Illumination Systems
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