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accept an offset between pixels and mask, work only on the intersection 

2005-07-28  Sven Neumann  <sven@gimp.org>

	* app/base/siox.[ch]: accept an offset between pixels and mask,
	work only on the intersection rectangle.

	* app/core/gimpdrawable-foreground-extract.c: pass the drawable
	offsets to siox_foreground_extract().
This commit is contained in:
Sven Neumann 2005-07-28 20:12:16 +00:00 committed by Sven Neumann
parent 55f7b68c23
commit b82d4c46c7
4 changed files with 56 additions and 23 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2005-07-28 Sven Neumann <sven@gimp.org>
* app/base/siox.[ch]: accept an offset between pixels and mask,
work only on the intersection rectangle.
* app/core/gimpdrawable-foreground-extract.c: pass the drawable
offsets to siox_foreground_extract().
2005-07-28 Sven Neumann <sven@gimp.org>
* app/base/siox.c: allow to enable some debug output.

64
app/base/siox.c
View File

@ -44,14 +44,17 @@
#include "paint-funcs/paint-funcs.h"
#include "core/gimp-utils.h" /* FIXME */
#include "cpercep.h"
#include "pixel-region.h"
#include "siox.h"
#include "tile-manager.h"
/* thresholds in the the mask, pixels < LOW are known background,
* pixels > HIGH are known foreground
/* Thresholds in the mask:
* pixels < LOW are known background
* pixels > HIGH are known foreground
*/
#define LOW 1
#define HIGH 254
@ -759,8 +762,11 @@ getclustersize (const gfloat limits[SIOX_DIMS])
* siox_foreground_extract:
* @pixels: the tiles to extract the foreground from
* @colormap: colormap in case @pixels are indexed, %NULL otherwise
* @mask: a trimap indicating sure foreground, sure background and
* undecided regions
* @offset_x: horizontal offset of @pixels with respect to the @mask
* @offset_y: vertical offset of @pixels with respect to the @mask
* @mask: a mask indicating sure foreground (255), sure background (0)
* and undecided regions ([1..254]).
* @limits: a three dimensional float array specifing the accuracy,
* a good value is: { 0.66, 1.25, 2.5 }
* @smoothness: boundary smoothness (a good value is 3)
@ -770,6 +776,8 @@ getclustersize (const gfloat limits[SIOX_DIMS])
void
siox_foreground_extract (TileManager *pixels,
const guchar *colormap,
gint offset_x,
gint offset_y,
TileManager *mask,
const gfloat limits[SIOX_DIMS],
gint smoothness)
@ -777,6 +785,7 @@ siox_foreground_extract (TileManager *pixels,
PixelRegion srcPR;
PixelRegion mapPR;
gpointer pr;
gint x, y;
gint width, height;
gint bpp;
gint row, col;
@ -793,16 +802,25 @@ siox_foreground_extract (TileManager *pixels,
g_return_if_fail (pixels != NULL);
g_return_if_fail (mask != NULL && tile_manager_bpp (mask) == 1);
width = tile_manager_width (pixels);
height = tile_manager_height (pixels);
g_return_if_fail (tile_manager_width (mask) == width);
g_return_if_fail (tile_manager_height (mask) == height);
cpercep_init ();
gimp_rectangle_intersect (offset_x, offset_y,
tile_manager_width (pixels),
tile_manager_height (pixels),
0, 0,
tile_manager_width (mask),
tile_manager_height (mask),
&x, &y, &width, &height);
/* FIXME:
* Should clear the mask outside the rectangle that we are working on.
*/
if (! (width > 0 && height > 0))
return;
/* count given foreground and background pixels */
pixel_region_init (&mapPR, mask, 0, 0, width, height, FALSE);
pixel_region_init (&mapPR, mask, x, y, width, height, FALSE);
for (pr = pixel_regions_register (1, &mapPR);
pr != NULL;
@ -835,8 +853,9 @@ siox_foreground_extract (TileManager *pixels,
bpp = tile_manager_bpp (pixels);
/* create inputs for colorsignatures */
pixel_region_init (&srcPR, pixels, 0, 0, width, height, FALSE);
pixel_region_init (&mapPR, mask, 0, 0, width, height, FALSE);
pixel_region_init (&srcPR, pixels,
x - offset_x, y - offset_y, width, height, FALSE);
pixel_region_init (&mapPR, mask, x, y, width, height, FALSE);
for (pr = pixel_regions_register (2, &srcPR, &mapPR);
pr != NULL;
@ -884,8 +903,9 @@ siox_foreground_extract (TileManager *pixels,
g_free (surefg);
/* Classify - the slow way....Better: Tree traversation */
pixel_region_init (&srcPR, pixels, 0, 0, width, height, FALSE);
pixel_region_init (&mapPR, mask, 0, 0, width, height, TRUE);
pixel_region_init (&srcPR, pixels,
x - offset_x, y - offset_y, width, height, FALSE);
pixel_region_init (&mapPR, mask, x, y, width, height, TRUE);
for (pr = pixel_regions_register (2, &srcPR, &mapPR);
pr != NULL;
@ -954,26 +974,26 @@ siox_foreground_extract (TileManager *pixels,
g_free (bgsig);
/* Smooth a bit for error killing */
smooth_mask (mask, 0, 0, width, height);
smooth_mask (mask, x, y, width, height);
/* Now erode, to make sure only "strongly connected components"
* keep being connected
*/
erode_mask (mask, 0, 0, width, height);
erode_mask (mask, x, y, width, height);
/* search the biggest connected component */
find_max_blob (mask, 0, 0, width, height);
find_max_blob (mask, x, y, width, height);
/* smooth again - as user specified */
for (i = 0; i < smoothness; i++)
smooth_mask (mask, 0, 0, width, height);
smooth_mask (mask, x, y, width, height);
/* Threshold the values */
threshold_mask (mask, 0, 0, width, height);
threshold_mask (mask, x, y, width, height);
/* search the biggest connected component again to kill jitter */
find_max_blob (mask, 0, 0, width, height);
find_max_blob (mask, x, y, width, height);
/* Now dilate, to fill up boundary pixels killed by erode */
dilate_mask (mask, 0, 0, width, height);
dilate_mask (mask, x, y, width, height);
}

2
app/base/siox.h
View File

@ -43,6 +43,8 @@
void siox_foreground_extract (TileManager *pixels,
const guchar *colormap,
gint offset_x,
gint offset_y,
TileManager *map,
const gfloat limits[SIOX_DIMS],
gint smoothness);

5
app/core/gimpdrawable-foreground-extract.c
View File

@ -42,6 +42,7 @@ gimp_drawable_foreground_extract (GimpDrawable *drawable,
GimpImage *gimage;
const guchar *colormap = NULL;
const gfloat limits[SIOX_DIMS] = { 0.66, 1.25, 2.5 };
gint x, y;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
@ -54,7 +55,9 @@ gimp_drawable_foreground_extract (GimpDrawable *drawable,
if (gimp_image_base_type (gimage) == GIMP_INDEXED)
colormap = gimp_image_get_colormap (gimage);
siox_foreground_extract (gimp_drawable_data (drawable), colormap,
gimp_item_offsets (GIMP_ITEM (drawable), &x, &y);
siox_foreground_extract (gimp_drawable_data (drawable), colormap, x, y,
gimp_drawable_data (mask),
limits, 3);