Abstract
Publisher Summary This chapter describes the modulation transfer function (MTF) measurements on channel image intensifiers. The MTF has been increasingly regarded as one of the most important ways of describing image quality. The application of the MTF to a particular type of imaging device is considered and some pitfalls that must be avoided if meaningful measurements are to be obtained are pointed out. If transfer functions are to be applicable to an image transfer process, the necessary conditions for Fourier transformation must be satisfied. The process must be linear in response and spatially stationary. The channel plate consists of a large number of electron multiplier tubes in a hexagonal array. If the pattern that is imaged through the device is limited to low spatial frequencies, the imaging process can be regarded as being stationary over the restricted spatial frequency range involved. The profile of the line-spread function is measured with a scanning microphotometer. The chapter suggests to use the normal subjective criteria of image-quality assessment to supplement the results of linear analysis.
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