Anti-Aliased Resampling
The most desirable approach is to ensure the frequency content scales proportionally with the image size, both horizontally and vertically. Figure 5.8 illustrates the fundamentals of an anti-aliased resampling process. The input data is upsampled by A and lowpass filtered to remove image frequencies created by the interpolation process. Filter B bandwidth-limits the signal to remove frequencies that will alias in the resampling process B. The ratio of B/A determines the scaling factor.
Figure 5.8. General Anti-Aliased Resampling Structure.
Technology Trade-offs
Filters A and B are usually combined into a single filter. ...
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