A System to Maintain Perceptually Linear Networked Display Devices

The CRT is commonly used to display digital medical image data. The brightness as a function of input signal is di erent for each CRT, is nonlinear and poorly matched to the human eye's perception of brightness change, decreases over time, and is easily changed with hardware contrast and brightness adjustments. Previous studies have suggested display brightness functions which are based on human visual experiments and which produce the same contrast perception for small display value changes at all brightness levels. The best scale depends on CRT luminance and scene dependent variables. We have developed an X Window based client server approach to maintain perceptually linear display scales using unique transformation tables for many display devices. Color use on X window systems is described. Perceptually linear human visual models are described. Finally we present a method to implement and maintain these models on a networked collection of X displays.

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