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  • optical transfer function (OTF) The function that characterizes the quality of an optical system by denoting the modulation and spatial phase shift of the image of a sinusoidal object with frequency as the independent variable. 
  • modulation transfer function (MTF) Also called sine wave response and contrast transfer function.The modulation transfer function is the ratio of the modulation in the image to the modulation in the object as a function of frequency (cycles per unit length) of the sinusoidal wave...
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