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Shrediquette avatar Shrediquette commented on May 29, 2024

This will wok:

clear all; clc;drawnow
selpath = uigetdir;
noise = 0; %noise 0 bis 0.05
z_move=0; %z_move
size=600; %image size x and y
partAm=20000;
Z=0.333; %sheet thickness
dt=4; %particle diameter
ddt=2; %particle diameter variation
disp(['Generating random artificial PIV images with ' num2str(partAm) ' particles...'])
for iiii = 0:99
disp(['Progress: ' int2str(iiii/99100) ' %']);
%% Generate random artificial particle images
u = zeros(size,size);
v=zeros(size,size);
offsety=v+0; %zero displacement in y direction
offsetx=u+iiii/10; %uniform x displacement increases from 0 to 99/10 pixels
[x,y]=meshgrid(1:1:size);
i=[];
j=[];
sizey=size;
sizex=size;
A=zeros(sizey,sizex);
B=A;
z0_pre=randn(partAm,1); %normal distributed sheet intensity
randn('state', sum(100clock)); %#ok<RAND>
z1_pre=randn(partAm,1); %normal distributed sheet intensity
z0=z0_pre(z_move/200+0.5)+z1_pre*(1-((z_move/200+0.5)));
z1=z1_pre*(z_move/200+0.5)+z0_pre*(1-((z_move/200+0.5)));

I0=255*exp(-(Z^2./(0.125*z0.^2))); %particle intensity
I0(I0>255)=255;
I0(I0<0)=0;

I1=255*exp(-(Z^2./(0.125*z1.^2))); %particle intensity
I1(I1>255)=255;
I1(I1<0)=0;

randn('state', sum(100*clock));
d=randn(partAm,1)/2; %particle diameter distribution
d=dt+d*ddt;
d(d<0)=0;
rand('state', sum(100*clock));
x0=rand(partAm,1)*sizex;
y0=rand(partAm,1)*sizey;
rd = -8.0 ./ d.^2;

xlimit1=floor(x0-d/2); %x min particle extent image1
xlimit2=ceil(x0+d/2); %x max particle extent image1
ylimit1=floor(y0-d/2); %y min particle extent image1
ylimit2=ceil(y0+d/2); %y max particle extent image1
xlimit2(xlimit2>sizex)=sizex;
xlimit1(xlimit1<1)=1;
ylimit2(ylimit2>sizey)=sizey;
ylimit1(ylimit1<1)=1;

%calculate particle extents for image2 (shifted image)
x0integer=round(x0);
x0integer(x0integer>sizex)=sizex;
x0integer(x0integer<1)=1;
y0integer=round(y0);
y0integer(y0integer>sizey)=sizey;
y0integer(y0integer<1)=1;

xlimit3=zeros(partAm,1);
xlimit4=xlimit3;
ylimit3=xlimit3;
ylimit4=xlimit3;
for n=1:partAm
	xlimit3(n,1)=floor(x0(n)-d(n)/2-offsetx((y0integer(n)),(x0integer(n)))); %x min particle extent image2
	xlimit4(n,1)=ceil(x0(n)+d(n)/2-offsetx((y0integer(n)),(x0integer(n)))); %x max particle extent image2
	ylimit3(n,1)=floor(y0(n)-d(n)/2-offsety((y0integer(n)),(x0integer(n)))); %y min particle extent image2
	ylimit4(n,1)=ceil(y0(n)+d(n)/2-offsety((y0integer(n)),(x0integer(n)))); %y max particle extent image2
end
xlimit3(xlimit3<1)=1;
xlimit4(xlimit4>sizex)=sizex;
ylimit3(ylimit3<1)=1;
ylimit4(ylimit4>sizey)=sizey;

ctr=0;
for n=1:partAm
	ctr=ctr+1;
	if ctr==10000
		ctr=0;
		%fprintf('.')
	end
	r = rd(n);
	for j=xlimit1(n):xlimit2(n)
		rj = (j-x0(n))^2;
		for i=ylimit1(n):ylimit2(n)
			A(i,j)=A(i,j)+I0(n)*exp((rj+(i-y0(n))^2)*r);
		end
	end
	for j=xlimit3(n):xlimit4(n)
		for i=ylimit3(n):ylimit4(n)
			B(i,j)=B(i,j)+I1(n)*exp((-(j-x0(n)+offsetx(i,j))^2-(i-y0(n)+offsety(i,j))^2)*-rd(n)); %place particle with gaussian intensity profile
		end
	end
end


%% Create random Background "glow"
bg=im2bw(rand(size,size),0.99999);
SE = strel('line',round(rand*90)+90,round(rand*180));
bg2=imdilate(bg,SE);
bg3 = imgaussfilt(double(bg2),40);
bg3=bg3/max(max(bg3));
bg3=bg3*0.1;
bg=im2bw(rand(size,size),0.999997);
SE = strel('disk',round(rand*100)+200,4);
bg2=imdilate(bg,SE);
bg4 = 0.12*imgaussfilt(double(bg2),100);
bg3(isnan(bg3))=0;
bg4(isnan(bg4))=0;

A=A+bg3*rand*255+bg4*rand*255;
B=B+bg3*rand*255+bg4*rand*255;

A(A>255)=255;
B(B>255)=255;
A=imnoise(uint8(A),'gaussian',0,noise);
B=imnoise(uint8(B),'gaussian',0,noise);

A=uint8(A);
B=uint8(B);

%True velocities, save if desired
x_real=x;
y_real=y;
u_real=u;
v_real=v;

imwrite(A,[selpath '\synth_image_' sprintf('%5.5d',iiii) '_A.jpg'],'Quality',97);
imwrite(B,[selpath '\synth_image_' sprintf('%5.5d',iiii) '_B.jpg'],'Quality',97);

end

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Shrediquette avatar Shrediquette commented on May 29, 2024

... but code formatting is broken in this github website

from pivlab.

WangJieHHU avatar WangJieHHU commented on May 29, 2024

This will work:
`clear all; clc;drawnow
selpath = uigetdir;
noise = 0; %noise 0 bis 0.05
z_move=0; %z_move
size=600; %image size x and y
partAm=20000;
Z=0.333; %sheet thickness
dt=4; %particle diameter
ddt=2; %particle diameter variation
disp(['Generating random artificial PIV images with ' num2str(partAm) ' particles...'])
for iiii = 0:99
disp(['Progress: ' int2str(iiii/99_100) ' %']); %% Generate random artificial particle images u = zeros(size,size); v=zeros(size,size); offsety=v+0; %zero displacement in y direction offsetx=u+iiii/10; %uniform x displacement increases from 0 to 99/10 pixels [x,y]=meshgrid(1:1:size); i=[]; j=[]; sizey=size; sizex=size; A=zeros(sizey,sizex); B=A; z0_pre=randn(partAm,1); %normal distributed sheet intensity randn('state', sum(100_clock)); %#ok<RAND> z1_pre=randn(partAm,1); %normal distributed sheet intensity z0=z0_pre(z_move/200+0.5)+z1_pre*(1-((z_move/200+0.5)));
z1=z1_pre*(z_move/200+0.5)+z0_pre*(1-((z_move/200+0.5)));

I0=255*exp(-(Z^2./(0.125*z0.^2))); %particle intensity
I0(I0>255)=255;
I0(I0<0)=0;

I1=255*exp(-(Z^2./(0.125*z1.^2))); %particle intensity
I1(I1>255)=255;
I1(I1<0)=0;

randn('state', sum(100*clock));
d=randn(partAm,1)/2; %particle diameter distribution
d=dt+d*ddt;
d(d<0)=0;
rand('state', sum(100*clock));
x0=rand(partAm,1)*sizex;
y0=rand(partAm,1)*sizey;
rd = -8.0 ./ d.^2;

xlimit1=floor(x0-d/2); %x min particle extent image1
xlimit2=ceil(x0+d/2); %x max particle extent image1
ylimit1=floor(y0-d/2); %y min particle extent image1
ylimit2=ceil(y0+d/2); %y max particle extent image1
xlimit2(xlimit2>sizex)=sizex;
xlimit1(xlimit1<1)=1;
ylimit2(ylimit2>sizey)=sizey;
ylimit1(ylimit1<1)=1;

%calculate particle extents for image2 (shifted image)
x0integer=round(x0);
x0integer(x0integer>sizex)=sizex;
x0integer(x0integer<1)=1;
y0integer=round(y0);
y0integer(y0integer>sizey)=sizey;
y0integer(y0integer<1)=1;

xlimit3=zeros(partAm,1);
xlimit4=xlimit3;
ylimit3=xlimit3;
ylimit4=xlimit3;
for n=1:partAm
	xlimit3(n,1)=floor(x0(n)-d(n)/2-offsetx((y0integer(n)),(x0integer(n)))); %x min particle extent image2
	xlimit4(n,1)=ceil(x0(n)+d(n)/2-offsetx((y0integer(n)),(x0integer(n)))); %x max particle extent image2
	ylimit3(n,1)=floor(y0(n)-d(n)/2-offsety((y0integer(n)),(x0integer(n)))); %y min particle extent image2
	ylimit4(n,1)=ceil(y0(n)+d(n)/2-offsety((y0integer(n)),(x0integer(n)))); %y max particle extent image2
end
xlimit3(xlimit3<1)=1;
xlimit4(xlimit4>sizex)=sizex;
ylimit3(ylimit3<1)=1;
ylimit4(ylimit4>sizey)=sizey;

ctr=0;
for n=1:partAm
	ctr=ctr+1;
	if ctr==10000
		ctr=0;
		%fprintf('.')
	end
	r = rd(n);
	for j=xlimit1(n):xlimit2(n)
		rj = (j-x0(n))^2;
		for i=ylimit1(n):ylimit2(n)
			A(i,j)=A(i,j)+I0(n)*exp((rj+(i-y0(n))^2)*r);
		end
	end
	for j=xlimit3(n):xlimit4(n)
		for i=ylimit3(n):ylimit4(n)
			B(i,j)=B(i,j)+I1(n)*exp((-(j-x0(n)+offsetx(i,j))^2-(i-y0(n)+offsety(i,j))^2)*-rd(n)); %place particle with gaussian intensity profile
		end
	end
end


%% Create random Background "glow"
bg=im2bw(rand(size,size),0.99999);
SE = strel('line',round(rand*90)+90,round(rand*180));
bg2=imdilate(bg,SE);
bg3 = imgaussfilt(double(bg2),40);
bg3=bg3/max(max(bg3));
bg3=bg3*0.1;
bg=im2bw(rand(size,size),0.999997);
SE = strel('disk',round(rand*100)+200,4);
bg2=imdilate(bg,SE);
bg4 = 0.12*imgaussfilt(double(bg2),100);
bg3(isnan(bg3))=0;
bg4(isnan(bg4))=0;

A=A+bg3*rand*255+bg4*rand*255;
B=B+bg3*rand*255+bg4*rand*255;

A(A>255)=255;
B(B>255)=255;
A=imnoise(uint8(A),'gaussian',0,noise);
B=imnoise(uint8(B),'gaussian',0,noise);

A=uint8(A);
B=uint8(B);

%True velocities, save if desired
x_real=x;
y_real=y;
u_real=u;
v_real=v;

imwrite(A,[selpath '\synth_image_' sprintf('%5.5d',iiii) '_A.jpg'],'Quality',97);
imwrite(B,[selpath '\synth_image_' sprintf('%5.5d',iiii) '_B.jpg'],'Quality',97);

end
`

Thank u！I‘m going to try it！

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