Perform a scale modification on a matrix (Multi Resolution Analysis).
[R] = NL_V_MRA(I,Z,O)
Matrix.
Scale factor.
Mode.
Output matrix.
NL_V_MRA performs the following scale modification on the matrix I of size (nxm) (Multi Resolution Analysis). The output matrix R size is Z times smaller than the one of I. There are four different modes: O=1 : mean, O=2 : max, O=3 : min and O=4 : median. Thus a single value is calculated for each non-overlapping block of size in respect with the defined mode.
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]=NL_V_RectanglesCorners(no,L,hm,hM,wm,wM);//generation of obstacles [P]=NL_V_PotentialRectangles(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=NL_V_MRA(P,z,o);//application of NL_V_MRA [Pzx,Pzy]=size(Pz);//image size w1=1;//window index scf(w1); clf(w1); grayplot(1:L,1:L,P);//graph visualization xset("colormap",graycolormap(128)); w2=2;//window index scf(w2); clf(w2); grayplot(1:Pzx,1:Pzy,Pz);//graph visualization xset("colormap",graycolormap(128)); | ![]() | ![]() |