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NARVAL >> NARVAL > NARVAL_IP_PixelNeighCont

NARVAL_IP_PixelNeighCont

Extract the neighborhood of a contour pixel of an obstacle.

Calling Sequence

[mat,nei,dch] = NARVAL_IP_PixelNeighCont(x,y,Im,C)

Parameters

x :

line index.

y :

column index.

Im :

binary image.

C :

contour matrix.

mat :

image neighborhood of defined pixel.

nei :

contour neighborhood of defined pixel.

dch :

number of modifications along the linear neighborhood.

Description

NARVAL_IP_PixelNeighCont extracts the neighborhood of the pixel [x,y] from the contour C of the obstacle Im. For each pixel in the neighborhood of [x,y], we have 8 neighbors represented by their relative coordinates [-1 -1 0 1 1 1 0 -1 ; 0 1 1 1 0 -1 -1 -1 ]. For each successive neighbors, we add the absolute values of their difference Im(N(i))-Im(N(i+1)) (cycle) to dch that gives an idea about the number of changes of the image along the linear neighborhood nei of the pixel [x,y].

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));
[Indx Indy]=find(Cont==1);//coordinates of contour points
[mat,nei,dch]=NARVAL_IP_PixelNeighCont(Indx(1),Indy(1),Pz,Cont);//application of NARVAL_IP_PixelNeighCont
mat
nei
dch

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

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