a Gaussian display pixel, however, the distorted waveform (solid line) in Fig. 4.2
results. This illustrates that the display process itself can degrade an image, even
one that has survived digitization and processing without damage.
The difficulties encountered in the foregoing sections illustrate that image
display using a physical display spot is a suboptimal process. While it is imprac-
tical to implement display devices with sin(ax)=ax–shaped display spots, there
are things that can be done to improve the situation.
4.4.1 Oversampling
The inappropriate shape of the display spot has less effect when there are more
sample points per cycle of the cosine. Thus one can improve the situation by
arranging to have many pixels that are small in relation ...