CRT COLORIMETRY .2. METROLOGY

The colorimetric characterization of computer-controlled CRT displays require radiometric measurements with high precision and accuracy in o rder to achieve acceptable colorimetric accuracy in defining stimuli g enerated with this type of imaging modality. Precision and accuracy re quirements for photometers, colorimeters, and spectroradiometers were evaluated. When models are used to relate digital counts defining a st imulus and resulting spectral radiant exitance, displays are assumed t o exhibit channel and spatial independence. A variety of tests and the results of evaluating four imaging systems are described. From these analyses, measurement accuracy is mainly limited by wavelength scale i n the case of spectroradiometers and filter fit in the case of colorim eters. Measurement precision is limited by the number of significant f igures for fixed-range devices and signal-to-noise limitations for low -luminance stimuli. Display accuracy is limited by a lack of channel a nd spatial independence. Display precision is mainly limited by the el ectronic design of the display and the stability and load independence of the gun amplifiers. (C) 1993 John Wiley & Sons, Inc.