How to avoid overlap two objects in image

I have the sample image I used this template to create a dataset at a different angle and position. it works well for generating one object but when I want to create a dataset for two objects as shown in the output image, the second object hide behind the first object How can I process to create two objects on the image?

the output image overlappng

function img_generate(img_width,img_hight,patch1,patch2,n)
a= img_width;
b=img_hight;

for i=1:n
   p =randi(300);
    q = randi(300);
    sample = patch1;
    x= randi(a-p)
    y = randi(b-q)
    %% Angle
    angle = randi(360);
    
    sample = imrotate(sample,angle);
    
    sample = imresize(sample,[p q]);
    
    img = uint8(zeros(a,b,1));
     
    img(x:x+p-1,y:y+q-1,:) = sample;
    p =randi(500);
    q = randi(500);
    sample = patch2;
    x= randi(a-p)
    y = randi(b-q)
    %% Angle
    angle = randi(360);
    
    sample = imrotate(sample,angle);
    
    sample = imresize(sample,[p q]);
    
     img(x:x+p-1,y:y+q-1,:) = sample;
   
    %%
    pathName = "D:\Hammad\New folder\datset";
    fileName = fullfile(pathName,sprintf('%d.jpg',i));
    imwrite(img,fileName);
end

clc; clear all; close all;


%% Image Size
img_width = 800;
img_hight = 800;
patch = imread("ImageResult.png");
patch = rgb2gray(patch);
n_images = 500;
img_generate_n(img_width,img_hight,patch,patch,n_images);

Answer 1

[DGM]

You're going to have to blend the sub-images as you combine them together. This is a simplified example of overlaying two copies of that image. Here are three simple blending methods that may be relevant.

% read image with alpha
[A,~,Aa] = imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/753289/image.png');
A = rgb2gray(im2double(A)).*im2double(Aa); % apply alpha
B = flip(A,2);

out_lighten = max(A,B);
imshow(out_lighten)

out_screen = 1-((1-A).*(1-B));
imshow(out_screen)

out_add = A+B;
imshow(out_add)

[Hafiz Muhammad Tayyab Abbas]

where can i change in the above code to run, when i change it the image are save a fully black

[A,~,ImageAlpha] = imread('ImageResult.png');
patch = rgb2gray(im2double(A)).*im2double(ImageAlpha);

[DGM]

Actually, I wouldn't worry about dealing with the alpha, at least for this image. In this particular case, it doesn't matter since the transparent regions are already black. When I posted the above, I didn't really bother to check.

The reason it wasn't working was because I was assuming a floating-point workflow, but you're explicitly allocating the output image to be uint8. That's fine, but the image classes need to be handled appropriately when they're combined.

% i didn't change anything here other than the filename
% Image Size
img_width = 800;
img_hight = 800;
patch = imread('comet.png');
patch = rgb2gray(patch);
n_images = 500;
img_generate(img_width,img_hight,patch,patch,n_images);

I added the relevant lines. You'll have to decide which to use (if any).

function img_generate(img_width,img_hight,patch1,patch2,n)
a = img_width;
b = img_hight;
for i=1:n
    p =randi(300);
    q = randi(300);
    sample = patch1;
    x = randi(a-p);
    y = randi(b-q);
    
    % Angle
    angle = randi(360);
    sample = imrotate(sample,angle);
    sample = imresize(sample,[p q]);
    
    img = uint8(zeros(a,b,1));
    img(x:x+p-1,y:y+q-1,:) = sample;
    
    p =randi(500);
    q = randi(500);
    sample = patch2;
    x = randi(a-p);
    y = randi(b-q);
    
    % Angle
    angle = randi(360);
    sample = imrotate(sample,angle);
    sample = imresize(sample,[p q]);
    
    BG = img(x:x+p-1,y:y+q-1,:); % copy of any existing image content here
    %img(x:x+p-1,y:y+q-1,:) = max(sample,BG); % lighten blend (for example)
    img(x:x+p-1,y:y+q-1,:) = im2uint8(1-((1-im2double(sample)).*(1-im2double(BG)))); % screen blend (for example)
    %img(x:x+p-1,y:y+q-1,:) = sample + BG; % addition blend (for example)
    
    % i'm just dumping everything in my sandbox directory
    fileName = sprintf('%d.jpg',i);
    imwrite(img,fileName);
end
end

[Hafiz Muhammad Tayyab Abbas]

Thanks for your answer it works,

How can i save x,y position and angle of the objects in .text file in the above code?

[yanqi liu]

sir，may be save the information on the filename

fileName = sprintf('%d_%.2f_%.2f_%.2f.jpg',i,x,y,angle);

[DGM]

There are a number of ways this could be done, but here's something basic:

function img_generate(img_width,img_hight,patch1,patch2,n)
a = img_width;
b = img_hight;
for i=1:n
    p =randi(300);
    q = randi(300);
    sample = patch1;
    x = randi(a-p);
    y = randi(b-q);
    
    % Angle
    angle = randi(360);
    sample = imrotate(sample,angle);
    sample = imresize(sample,[p q]);
    posdata = sprintf('%d,%d,%d\n',x,y,angle); % <--- store data
    
    img = uint8(zeros(a,b,1));
    img(x:x+p-1,y:y+q-1,:) = sample;
    
    p =randi(500);
    q = randi(500);
    sample = patch2;
    x = randi(a-p);
    y = randi(b-q);
    
    % Angle
    angle = randi(360);
    sample = imrotate(sample,angle);
    sample = imresize(sample,[p q]);
    posdata = [posdata sprintf('%d,%d,%d',x,y,angle)]; % <--- add another line
    
    BG = img(x:x+p-1,y:y+q-1,:); % copy of any existing image content here
    %img(x:x+p-1,y:y+q-1,:) = max(sample,BG); % lighten blend (for example)
    img(x:x+p-1,y:y+q-1,:) = im2uint8(1-((1-im2double(sample)).*(1-im2double(BG)))); % screen blend (for example)
    %img(x:x+p-1,y:y+q-1,:) = sample + BG; % addition blend (for example)
    
    % i'm just dumping everything in my sandbox directory
    fileName = sprintf('%0.3d.jpg',i); % consider using leading zeros to ease sorting issues
    imwrite(img,fileName);
    
    % write the stored data to disk
    fileName = sprintf('%0.3d.txt',i);
    fid = fopen(fileName,'w');
    fprintf(fid,posdata);
    fclose(fid);
end
end

You'll have to decide exactly what data you want to store (x&y offsets, height & width, centers, angle, etc), and how you want them formatted (headers, delimiters, etc)