User`s guide

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31
Figure 7-20. Scaling filters
Lanczos fi lter
The Lanczos fi lter is using a 4x4 kernel. This fi lter is recommended for use with images that
contains large amounts of fi ne detail, for example text with small fonts. On thin, diagonal or
curved lines, some ripple may be encountered.
B-spline fi lter
The B-spline fi lter available in MIPS is of the type Cubic B-spline. This fi lter is slightly softer
than the Lanczos fi lter, but has better quality on curved and straight lines. In many cases, this
fi ler will give the best image quality and is therefore the default selection.
C-spline fi lter
The C-spline fi lter is short for Cubic Hermite spline interpolation. It is a fi lter of third-degree
spline with each polynomial of the spline in Hermite form (Named in the honor of Charles
Hermite). This fi lter gives a good combination of smoothness, detail and average rippel on
lines.
Linear interpolation fi lter
This fi lter is also a polynominal fi lter, but is based on linear interpolation for curve fi tting.
In modern systems, it will give an un-necessarily low quality image scaling, but some
applications may still require the use of this fi lter.