how to generate some random lines with known width/ diameter value

I want to generate a simulated thick line network like the following image, where the line thickness is known. How can I draw such kind of network with known line width and different orientation? Please help me.

Answer 1

[Image Analyst]

See this demo:

% Demo to burn lines the user draws into an image.  
% Multiple lines may be drawn and they all get burned in.

%----- Initializing steps -----
% Clean up
clc;
clear all;
close all;
workspace; % Display the workspace panel.
fontSize = 20;

hasIPT = license('test', 'image_toolbox');
if ~hasIPT
  % User does not have the toolbox installed.
  message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.\nDo you want to try to continue anyway?');
  reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
  if strcmpi(reply, 'No')
    % User said No, so exit.
    return;
  end
end

% Display images to prepare for the demo.
monochromeImage = imread('pout.tif');
subplot(2, 2, 1);
imshow(monochromeImage);
title('Original Image', 'FontSize', fontSize);
subplot(2, 2, 2);
imshow(monochromeImage);
title('DRAW LINE HERE!!!', 'FontSize', fontSize);
subplot(2, 2, 4);
imshow(monochromeImage);
title('Original Image with lines burned into image', 'FontSize', fontSize);
set(gcf, 'units','normalized','outerposition',[0 0 1 1]); % Maximize figure.
set(gcf,'name','Image Analysis Demo','numbertitle','off') 

%----- Burn line into image -----
burnedImage = monochromeImage;
% Create a binary image for all the lines we will draw.
cumulativeBinaryImage = false(size(burnedImage));
subplot(2, 2, 3);
imshow(monochromeImage);
title('Binary Image', 'FontSize', fontSize);
% Create line mask, h, as an ROI object over the second image in the bottom row.
axis on;
again = true;
lineCount = 0;
while again && lineCount < 20
  promptMessage = sprintf('Draw line #%d in the upper right image,\nor Quit?', lineCount + 1);
  titleBarCaption = 'Continue?';
  button = questdlg(promptMessage, titleBarCaption, 'Draw', 'Quit', 'Draw');
  if strcmpi(button, 'Quit')
    break;
  end
  lineCount = lineCount + 1;
  subplot(2, 2, 2);
  hLine = imline(gca);
  caption = sprintf('DRAW HERE.  Original Image with %d lines in overlay.', lineCount);
  title(caption, 'FontSize', fontSize);

  % Create a binary image ("mask") from the ROI object.
  singleLineBinaryImage = hLine.createMask();
  % Thicken the line by a random amount
  radius = round(20*rand);
  se = strel('disk', radius, 0);
  singleLineBinaryImage = imdilate(singleLineBinaryImage, se);
  % OR it in to the "all lines" binary image mask we're building up.
  cumulativeBinaryImage = cumulativeBinaryImage | singleLineBinaryImage;
  % Display the lines mask.
  subplot(2, 2, 3);
  imshow(cumulativeBinaryImage);
  caption = sprintf('Binary mask of the %d lines', lineCount);
  title(caption, 'FontSize', fontSize);
  
  % Burn line into image by setting it to 255 wherever the mask is true.
  burnedImage(cumulativeBinaryImage) = 255;
  % Display the image with the "burned in" line.
  subplot(2, 2, 4);
  cla;
  imshow(burnedImage);
  caption = sprintf('New image with %d lines burned into image', lineCount);
  title(caption, 'FontSize', fontSize);
end

[sheli whitson]

Thank you Image Analyst. Sir, I want to draw multiple lines with known diameter value. Some of these lines need to overlap each other.I am getting an error while trying to run your program. I am getting following error:

Error using  | 
Matrix dimensions must agree.

Error in line2 (line 46)
  cumulativeBinaryImage = cumulativeBinaryImage | singleLineBinaryImage;
how can i solve that? Thanks in advance.

[Image Analyst]

I just copied and pasted my code right out of my answer above and it worked fine. In my code, line 46 is

again = true;

NOT

cumulativeBinaryImage = cumulativeBinaryImage | singleLineBinaryImage;

You must have changed it. Please post your changed code so I can fix it.

[sheli whitson]

Sorry, sir. I think I selected different input image that is why got that error. Now it works fine. I have one question can I draw multiple lines by varying the diameter just by changing 'rand value? I mean just by changing the value of rand from this line

'radius = round(20*rand)'. Am i right?

[Image Analyst]

Yes, you can create the radius (width) of that line by whatever method you want.

Answer 2

[KSSV]

x = rand(2,1);
y = rand(2,1);
plot(x,y,'r','linewidth',10)

Put the above code in loop, make figure background black, linecolor white.

[Image Analyst]

That plots in the overlay - it does not make a binary image with the lines burned into it, which I think the poster wants.