From 8fabbd0dcf3ac91bfced555fdf4819f500b6a88e Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 7 Mar 2015 23:22:34 +0100 Subject: [PATCH] doc/filters: Add some random examples for fftfilt Reviewed-by: Timothy Gu Signed-off-by: Michael Niedermayer --- doc/filters.texi | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/doc/filters.texi b/doc/filters.texi index b15087c0e1..b0ea2ca2ca 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -4629,6 +4629,29 @@ The coordinates of the current sample. The width and height of the image. @end table +@subsection Examples + +@itemize +@item +High-pass: +@example +fftfilt=dc_Y=128:weight_Y='squish(1-(Y+X)/100)' +@end example + +@item +Low-pass: +@example +fftfilt=dc_Y=0:weight_Y='squish((Y+X)/100-1)' +@end example + +@item +Sharpen: +@example +fftfilt=dc_Y=0:weight_Y='1+squish(1-(Y+X)/100)' +@end example + +@end itemize + @section field Extract a single field from an interlaced image using stride