File:Moire densite gris.png

Moiré par interférences de fonctions sinusoïdales.

Moiré by interferences of sinus functions.

Auteur/author : Christophe Dang Ngoc Chan (cdang)

Réalisé avec/made with : Scilab

clear;clf;

// Domaine d'étude

pas=0.1;
X=0:pas:20*%pi';
NX=size(X);nx=NX(1,2);

// nombres d'onde (fréquences spatiales)

k1=1;
k2=1.1*k1;

// Densités de gris

Y1=sin(k1*X)+1;
Y2=sin(k2*X)+1;
Y3=Y1+Y2;

// largeur des bandes

for i=1:nx
   for j=1:50
      Z(i,j)=Y1(i);
      Z(i,50+j)=Y3(i);
      Z(i,100+j)=Y2(i);
   end
end

// tracé

cmap1=[1:-1/255:0]';
cmap=[cmap1,cmap1,cmap1];
xset('colormap',cmap)
grayplot(X,1:150,Z)
a=get('current_axes');
a.axes_visible=['off','off','off'];
a.tight_limits='on';

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