MATLAB: How to calcuate the distance from two selected points

ginput

Is there a simple way (a command) to be able to identify in a grafical way the distance beetween two points on a figure? If I have a figure with some points I wonder if There is a way that allow you to have in ouput the distance between the two selected points? For example a sort of ginput command. Have you got an idea?

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imdistline

Matlab documentation: http://www.mathworks.com/help/images/ref/imdistline.html

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MATLAB: How to draw a circle on existed circle ? How to calculate the image shift in pixels from its center

You can use bwboundaries if all you want to do is draws outlines of the boundaries in the overlay above the original image:

format longg;
format compact;
clc;  % Clear command window.
workspace;  % Make sure the workspace panel is showing.
fontSize = 25;
% Read in a standard MATLAB gray scale demo image.
folder = 'C:\Users\Naresh\Documents\Temporary';
baseFileName = 'imfill.jpg';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
  % File doesn't exist -- didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
grayImage = imread(fullFileName);
% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage)
% Display the original gray scale image.

subplot(2, 2, 1);
imshow(grayImage, []);
axis square;
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off') 
% Create a binary image.
binaryImage = grayImage < 128;
subplot(2, 2, 2);
imshow(binaryImage);
axis square;
title('Binary Image', 'FontSize', fontSize);
% bwboundaries() returns a cell array, where each cell contains the row/column coordinates for an object in the image.
% Plot the borders of all the coins on the original grayscale image using the coordinates returned by bwboundaries.
% Display the original gray scale image.
subplot(2, 2, 3);
imshow(grayImage, []);
title('Original Grayscale Image with Outlines from bwboundaries()', 'FontSize', fontSize);
axis square;
hold on;
boundaries = bwboundaries(binaryImage);
numberOfBoundaries = size(boundaries, 1);
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'r-', 'LineWidth', 3);
end
hold off;

MATLAB: In the code below can we make freehand drawing of the line instead of straight line

See my attached demos of imfreehand().

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MATLAB: How to draw a circle on existed circle ? How to calculate the image shift in pixels from its center

MATLAB: In the code below can we make freehand drawing of the line instead of straight line

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