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fix rank hist rules

This commit is contained in:
John Cupitt 2021-01-13 11:20:38 +00:00
parent 3cd774a10c
commit 78d1a4ae57
1 changed files with 6 additions and 5 deletions
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11
libvips/morphology/rank.c
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@ -479,13 +479,14 @@ vips_rank_build( VipsObject *object )
/* Enable the hist path if it'll probably help.
*/
if( in->BandFmt == VIPS_FORMAT_UCHAR ) {
/* The hist path gets faster for windows larger than about
* 3x3, or 10x10 for the special max/min case.
/* The hist path is always faster for windows larger than about
* 10x10, and faster for >3x3 on the non-max/min case.
*/
if( rank->n < 10 )
if( rank->n > 90 )
rank->hist_path = TRUE;
else if( rank->n < 90 &&
(rank->index == 0 || rank->index == rank->n - 1) )
else if( rank->n > 10 &&
rank->index != 0 &&
rank->index != rank->n - 1 )
rank->hist_path = TRUE;
}