β Scribed by Theo Pavlidis
No coin nor oath required. For personal study only.
Color displays used in image processing systems consist of a refresh memory buffer storing digital image data which are converted into analog signals to display an image by driving the primary color channels (Red, Green, and Blue) of a color television monitor. The color cathode ray tube (CRT) of the monitor is unable to reproduce colors exactly because of phosphor limitations, exponential luminance response of the tube to the applied signal, and limitations imposed by the digital-to-analog conversion. In this paper we describe some computer simulation studies (using the I!/* V* W* color space) carried out to measure these reproduction errors. Further, a procedure to correct for color reproduction error resulting from the exponential luminance response (gamma) of the picture tube is proposed, using a video-lookup table and a higher resolution digital-to-analog converter. It is found, on the basis of computer simulation studies, that the proposed gamma correction scheme is effective and robust with respect to variations in the assumed value of the gamma.
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