Spatial frequency response techniques have been used in the past for the evaluation and design of image processing systems. In this paper, these techniques are extended to permit a statistical analysis of degradation in scanned image systems. The analytical techniques used have been developed by engineers for the statistical analysis of sampled data systems. The use of these techniques allows an evaluation of the average degradation of the actual images to be processed, rather than the degradation of hypothetical test images. In addition, the statistical figure of merit used to measure degradation appears to be a good measure of human readability of degraded images. General expressions for degradation in terms of scan density, the system transfer functions, and statistical parameters of the images are derived in this paper for several classes of linear scanned image systems.
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