mirror of
https://github.com/opencv/opencv.git
synced 2024-11-30 06:10:02 +08:00
140 lines
3.7 KiB
Python
Executable File
140 lines
3.7 KiB
Python
Executable File
#!/usr/bin/python
|
|
"""
|
|
the script demostrates iterative construction of
|
|
delaunay triangulation and voronoi tesselation
|
|
|
|
Original Author (C version): ?
|
|
Converted to Python by: Roman Stanchak
|
|
"""
|
|
import cv2.cv as cv
|
|
import random
|
|
|
|
def draw_subdiv_point( img, fp, color ):
|
|
cv.Circle( img, (cv.Round(fp[0]), cv.Round(fp[1])), 3, color, cv.CV_FILLED, 8, 0 );
|
|
|
|
def draw_subdiv_edge( img, edge, color ):
|
|
org_pt = cv.Subdiv2DEdgeOrg(edge);
|
|
dst_pt = cv.Subdiv2DEdgeDst(edge);
|
|
|
|
if org_pt and dst_pt :
|
|
|
|
org = org_pt.pt;
|
|
dst = dst_pt.pt;
|
|
|
|
iorg = ( cv.Round( org[0] ), cv.Round( org[1] ));
|
|
idst = ( cv.Round( dst[0] ), cv.Round( dst[1] ));
|
|
|
|
cv.Line( img, iorg, idst, color, 1, cv.CV_AA, 0 );
|
|
|
|
|
|
def draw_subdiv( img, subdiv, delaunay_color, voronoi_color ):
|
|
|
|
for edge in subdiv.edges:
|
|
edge_rot = cv.Subdiv2DRotateEdge( edge, 1 )
|
|
|
|
draw_subdiv_edge( img, edge_rot, voronoi_color );
|
|
draw_subdiv_edge( img, edge, delaunay_color );
|
|
|
|
|
|
def locate_point( subdiv, fp, img, active_color ):
|
|
|
|
(res, e0) = cv.Subdiv2DLocate( subdiv, fp );
|
|
|
|
if res in [ cv.CV_PTLOC_INSIDE, cv.CV_PTLOC_ON_EDGE ]:
|
|
e = e0
|
|
while True:
|
|
draw_subdiv_edge( img, e, active_color );
|
|
e = cv.Subdiv2DGetEdge(e, cv.CV_NEXT_AROUND_LEFT);
|
|
if e == e0:
|
|
break
|
|
|
|
draw_subdiv_point( img, fp, active_color );
|
|
|
|
|
|
def draw_subdiv_facet( img, edge ):
|
|
|
|
t = edge;
|
|
count = 0;
|
|
|
|
# count number of edges in facet
|
|
while count == 0 or t != edge:
|
|
count+=1
|
|
t = cv.Subdiv2DGetEdge( t, cv.CV_NEXT_AROUND_LEFT );
|
|
|
|
buf = []
|
|
|
|
# gather points
|
|
t = edge;
|
|
for i in range(count):
|
|
assert t>4
|
|
pt = cv.Subdiv2DEdgeOrg( t );
|
|
if not pt:
|
|
break;
|
|
buf.append( ( cv.Round(pt.pt[0]), cv.Round(pt.pt[1]) ) );
|
|
t = cv.Subdiv2DGetEdge( t, cv.CV_NEXT_AROUND_LEFT );
|
|
|
|
if( len(buf)==count ):
|
|
pt = cv.Subdiv2DEdgeDst( cv.Subdiv2DRotateEdge( edge, 1 ));
|
|
cv.FillConvexPoly( img, buf, cv.RGB(random.randrange(256),random.randrange(256),random.randrange(256)), cv.CV_AA, 0 );
|
|
cv.PolyLine( img, [buf], 1, cv.RGB(0,0,0), 1, cv.CV_AA, 0);
|
|
draw_subdiv_point( img, pt.pt, cv.RGB(0,0,0));
|
|
|
|
def paint_voronoi( subdiv, img ):
|
|
|
|
cv.CalcSubdivVoronoi2D( subdiv );
|
|
|
|
for edge in subdiv.edges:
|
|
|
|
# left
|
|
draw_subdiv_facet( img, cv.Subdiv2DRotateEdge( edge, 1 ));
|
|
|
|
# right
|
|
draw_subdiv_facet( img, cv.Subdiv2DRotateEdge( edge, 3 ));
|
|
|
|
if __name__ == '__main__':
|
|
win = "source";
|
|
rect = ( 0, 0, 600, 600 );
|
|
|
|
active_facet_color = cv.RGB( 255, 0, 0 );
|
|
delaunay_color = cv.RGB( 0,0,0);
|
|
voronoi_color = cv.RGB(0, 180, 0);
|
|
bkgnd_color = cv.RGB(255,255,255);
|
|
|
|
img = cv.CreateImage( (rect[2],rect[3]), 8, 3 );
|
|
cv.Set( img, bkgnd_color );
|
|
|
|
cv.NamedWindow( win, 1 );
|
|
|
|
storage = cv.CreateMemStorage(0);
|
|
subdiv = cv.CreateSubdivDelaunay2D( rect, storage );
|
|
|
|
print "Delaunay triangulation will be build now interactively."
|
|
print "To stop the process, press any key\n";
|
|
|
|
for i in range(200):
|
|
fp = ( random.random()*(rect[2]-10)+5, random.random()*(rect[3]-10)+5 )
|
|
|
|
locate_point( subdiv, fp, img, active_facet_color );
|
|
cv.ShowImage( win, img );
|
|
|
|
if( cv.WaitKey( 100 ) >= 0 ):
|
|
break;
|
|
|
|
cv.SubdivDelaunay2DInsert( subdiv, fp );
|
|
cv.CalcSubdivVoronoi2D( subdiv );
|
|
cv.Set( img, bkgnd_color );
|
|
draw_subdiv( img, subdiv, delaunay_color, voronoi_color );
|
|
cv.ShowImage( win, img );
|
|
|
|
if( cv.WaitKey( 100 ) >= 0 ):
|
|
break;
|
|
|
|
|
|
cv.Set( img, bkgnd_color );
|
|
paint_voronoi( subdiv, img );
|
|
cv.ShowImage( win, img );
|
|
|
|
cv.WaitKey(0);
|
|
|
|
cv.DestroyWindow( win );
|