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diff --git a/doc/filters.texi b/doc/filters.texi index e3005c3278..0b0903e5a7 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -9940,6 +9940,47 @@ gradfun=radius=8 @end itemize +@section greyedge +A color constancy variation filter which estimates scene illumination via grey edge algorithm +and corrects the scene colors accordingly. + +See: @url{https://staff.science.uva.nl/th.gevers/pub/GeversTIP07.pdf} + +The filter accepts the following options: + +@table @option +@item difford +The order of differentiation to be applied on the scene. Must be chosen in the range +[0,2] and default value is 1. + +@item minknorm +The Minkowski parameter to be used for calculating the Minkowski distance. Must +be chosen in the range [0,65535] and default value is 1. Set to 0 for getting +max value instead of calculating Minkowski distance. + +@item sigma +The standard deviation of Gaussian blur to be applied on the scene. Must be +chosen in the range [0,1024.0] and default value = 1. Sigma can't be set to 0 +if @var{difford} is greater than 0. +@end table + +@subsection Examples +@itemize + +@item +Grey Edge: +@example +greyedge=difford=1:minknorm=5:sigma=2 +@end example + +@item +Max Edge: +@example +greyedge=difford=1:minknorm=0:sigma=2 +@end example + +@end itemize + @anchor{haldclut} @section haldclut |