Chapter 5MTF, Resolution, Contrast, and Nyquist Theory
To determine resolution, a raster is normally used, employing increasingly fine bars and gaps. A common example in real images would be a picket fence displayed in perspective. In the image of the fence, shown in Figure 5.1, it is evident that the gaps between the boards become increasingly difficult to discriminate as the distance becomes greater. This effect is the basic problem of every optical image. In the foreground of the image, where the boards and gaps haven’t yet been squeezed together by the perspective, a large difference in brightness is recognized. The more the boards and gaps are squeezed together in the distance, the less difference is seen in the brightness.
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