Abstract
It is proposed that the number N* , given by N*=4ab [\int\min{0}\max{\infin}T(f) df]^{2} , is equal to the number of picture elements in an image within which the noise-free modulation transfer function T(f) of the image device (display) is uniform and isotropic; a and b are the edge lengths (mm) of a rectangular format, and f is the spatial frequency (cycles/mm). An equation for N* , that applies to nonuniform and anisotropic modulation transfer functions is also given. A picture element transfer efficiency E* is defined as ( N*/N*' ), where N*' is the number of picture elements transferred to the image (display) by an ideal device.
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