% and rational (high Q) approximations, and will be used by default in
% most cases.
%
-% The Lanczos2D and Robidoux filters are designed for cylindrical
-% (radial) EWA distortion. The Lanczos2D filter is a 2-lobed Lanczos
-% using Sinc/Jinc as appropriate. The Robidoux filter used to be a
-% slightly sharpened version of Lanczos2D (with blur=0.958033808);
-% Now, it is a Cubic 'Keys' filter tuned so that images with only
-% vertical (or horizontal) features are exactly preserved when
-% performing 'no-op" with EWA distortion (it turns out to be close to
-% both plain Mitchell and "sharpened" Lanczos2D).
+% The Lanczos2D and Robidoux filters are tuned for cylindrical
+% (radial) EWA (Elliptical Weighted Average) distortion. Lanczos2D
+% is a 2-lobed Lanczos filter using Sinc or Jinc (as appropriate).
+% Robidoux used to be a slightly sharpened version of Lanczos2D (with
+% blur=0.958033808); Now, it is a Cubic 'Keys' filter tuned so that
+% images with only vertical (or horizontal) features are exactly
+% preserved when performing 'no-op" with EWA distortion, which turns
+% out to be close to both plain Mitchell and "sharpened" Lanczos2D.
%
% Special 'expert' options can be used to override any and all filter
% settings. This is not advised unless you have expert knowledge of
{ SincFastFilter, TriangleFilter }, /* Bartlett -- triangle-sinc */
{ SincFastFilter, BoxFilter }, /* Raw fast sinc ("Pade"-type) */
{ Lanczos2DFilter, JincFilter }, /* SPECIAL: 2-lobed jinc-jinc */
- { RobidouxFilter, BoxFilter }, /* SPECIAL: Keys cubic tuned for EWA */
+ { RobidouxFilter, BoxFilter }, /* SPECIAL: Keys cubic tuned for EWA */
};
/*
Table mapping the filter/window from the above table to an actual