<< NARVAL_IP_NR2RowCol NARVAL NARVAL_IP_ObstCornersDR >>

NARVAL >> NARVAL > NARVAL_IP_ObstCorners

NARVAL_IP_ObstCorners

Extract the corners of an obstacle contour.

Calling Sequence

[x,y,d,n] = NARVAL_IP_ObstCorners(c)

Parameters

c :

contour matrix.

x :

x-coordinates of corners.

y :

y-coordinates of corners.

d :

direction vector.

n :

length vector.

Description

NARVAL_IP_ObstCorners extracts the corners of the obstacle contour c. Their coordinates are stored in [x,y]. d gives the direction vector ([1 2 3 4 5 6 7 8]) of each corner found in each object. n provides the numbers of corners for each object.

Examples

dt=getdate();
seed=dt(10);
rand('seed',seed);//initialization of the random values generator
no=4;//quantity of obstacles (rectangle)
L=1000;//squared area side
hm=100;//minimal height
hM=250;//maximal height
wm=100;//minimal width
wM=250;//maximal width
Al=[0 %pi/2 %pi -%pi/2];//available angles for obstacles
[Xs,Ys,X,Y,H,W,A]=NARVAL_IP_RectObstacles(no,L,hm,hM,wm,wM);//generation of obstacles
[P]=NARVAL_IP_PotentialRot(X,Y,H,W,A,L);//generation of obstacle matrix
z=10;//zoom factor
o=2;// 1=mean, 2=max, 3=min, 4=median
Pz=NARVAL_IP_MRA(P,z,o);//scale modification
[Pzx,Pzy]=size(Pz);//image size
w1=1;//window index
w2=2;//window index
scf(w1);
clf(w1);
grayplot(1:Pzx,1:Pzy,Pz);//graph visualization
xset("colormap",graycolormap(128));
scf(w2);
clf(w2);
[PEz]=NARVAL_IP_Erosion(Pz);//contour performance
Cont=Pz-PEz;//contour 1
[Contx,Conty]=size(Cont);//image size
grayplot(1:Contx,1:Conty,Cont);//graph visualization
xset("colormap",graycolormap(128));
[x,y,direction,n]=NARVAL_IP_ObstCorners(Cont);//application of NARVAL_IP_ObstCorners
x
y
direction
n

Dependency

NARVAL_IP_PixelNeighCont, NARVAL_F_Remov

Authors

Foued Melakessou

Contact

Dr. Foued Melakessou

Research Associate

Interdisciplinary Centre for Security, Reliability and Trust

Room F106

University of Luxembourg

6, rue Coudenhove Kalergi

L-1359 Luxembourg-Kirchberg

E-mail: foued.melakessou@uni.lu

Tel: (+352) 46 66 44 5346

Home Page


<< NARVAL_IP_NR2RowCol NARVAL NARVAL_IP_ObstCornersDR >>