Unsharpness in an image is a consequence of four factors that contribute to image
formation. These factors, considered collectively as the components of unsharpness,
are geometric unsharpness Ug , subject unsharpness Us , motion unsharpness Um,
and receptor unsharpness Ur. Under conditions where each of these factors contributes independently to the overall unsharpness of the image, the total unsharpness
is
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