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hough_circle 20% speedup

This commit is contained in:
John Cupitt 2018-02-02 07:39:10 +00:00
parent 78db92e60e
commit 59afb52f7c
1 changed files with 15 additions and 22 deletions
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37
libvips/arithmetic/hough_circle.c
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@ -2,6 +2,8 @@
*
* 7/3/14
* - from hough_line.c
* 2/1/18
* - 20% speedup
*/
/*
@ -141,37 +143,24 @@ vips_hough_circle_init_accumulator( VipsHough *hough, VipsImage *accumulator )
return( 0 );
}
static inline void
vips_hough_circle_vote_point( VipsImage *image, int x, int y, void *client )
{
guint *q = (guint *) VIPS_IMAGE_ADDR( image, x, y );
int r = *((int *) client);
g_assert( image->BandFmt == VIPS_FORMAT_UINT );
g_assert( x >= 0 );
g_assert( y >= 0 );
g_assert( x < image->Xsize );
g_assert( y < image->Ysize );
g_assert( r >= 0 );
g_assert( r < image->Bands );
q[r] += 1;
}
/* Vote endpoints, with clip.
*/
static void
vips_hough_circle_vote_endpoints_clip( VipsImage *image,
int y, int x1, int x2, int quadrant, void *client )
{
int r = *((int *) client);
guint *line = (guint *) VIPS_IMAGE_ADDR( image, 0, y ) + r;
int b = image->Bands;
if( y >= 0 &&
y < image->Ysize ) {
if( x1 >=0 &&
x1 < image->Xsize )
vips_hough_circle_vote_point( image, x1, y, client );
line[x1 * b] += 1;
if( x2 >=0 &&
x2 < image->Xsize )
vips_hough_circle_vote_point( image, x2, y, client );
line[x2 * b] += 1;
}
}
@ -181,8 +170,12 @@ static void
vips_hough_circle_vote_endpoints_noclip( VipsImage *image,
int y, int x1, int x2, int quadrant, void *client )
{
vips_hough_circle_vote_point( image, x1, y, client );
vips_hough_circle_vote_point( image, x2, y, client );
int r = *((int *) client);
guint *line = (guint *) VIPS_IMAGE_ADDR( image, 0, y ) + r;
int b = image->Bands;
line[x1 * b] += 1;
line[x2 * b] += 1;
}
/* Cast votes for all possible circles passing through x, y.
@ -211,7 +204,7 @@ vips_hough_circle_vote( VipsHough *hough, VipsImage *accumulator, int x, int y )
cy - r >= 0 &&
cy + r < accumulator->Ysize )
draw_scanline = vips_hough_circle_vote_endpoints_noclip;
else
else
draw_scanline = vips_hough_circle_vote_endpoints_clip;
vips__draw_circle_direct( accumulator,