... MTF can be obtained by observation of the composite sine-wave grating of Figure 2.4-3, in which spatial frequency increases in one coordinatedirection and contrast increases in the other direction. ... logarithmicresponse to input intensity, then if a signal grating contains a recording of anexponential sine wave, that is, , the human visual system can belinearized. A hypothetical MTF obtained by measuring ... coordinates,remain invariant over a wide dynamic range. Examination of Eqs. 2.5-1 and 2.5-2indicates that the chrominance signals and are unchanged in this case, andthat the luminance signal increases...