How to draw vertical line and a horizontal line passing from the centroid of a region?The horizontal and vertical line should be inside the region only.I also want to find the length of the lines.Please help me.
MATLAB: How to draw vertical line and a horizontal line passing from the centroid of a region
centroidhorizontalImage Processing Toolboxshape recognitionvertical
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Mohsina, try this:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format short g;format compact;fontSize = 25;%===============================================================================
% Get the name of the image the user wants to use.
baseFileName = 'image1.png';% Get the full filename, with path prepended.
folder = []; % Determine where demo folder is (works with all versions).
fullFileName = fullfile(folder, baseFileName);%===============================================================================% Read in a demo image.
grayImage = imread(fullFileName);% Get the dimensions of the image.
% numberOfColorChannels should be = 1 for a gray scale image, and 3 for an RGB color image.
[rows, columns, numberOfColorChannels] = size(grayImage)if numberOfColorChannels > 1 % It's not really gray scale like we expected - it's color.
% Use weighted sum of ALL channels to create a gray scale image.
grayImage = rgb2gray(grayImage); % ALTERNATE METHOD: Convert it to gray scale by taking only the green channel,
% which in a typical snapshot will be the least noisy channel.
% grayImage = grayImage(:, :, 2); % Take green channel.
end% Display the image.
subplot(2, 2, 1);imshow(grayImage, []);axis on;axis image;caption = sprintf('Original Gray Scale Image');title(caption, 'FontSize', fontSize, 'Interpreter', 'None');drawnow;hp = impixelinfo();% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0, 0, 1, 1]);% Get rid of tool bar and pulldown menus that are along top of figure.
% set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')drawnow;% Create binary image of the black blobs from grayscale image.
binaryImage = grayImage == 0;% Get rid of the background.
binaryImage = imclearborder(binaryImage);% Display the image.subplot(2, 2, 2);imshow(binaryImage, []);axis on;axis image;title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');% Label the blobs
[labeledImage, numBlobs] = bwlabel(binaryImage);% Display the image.subplot(2, 2, 2);imshow(binaryImage, []);axis on;axis image;title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');% Let's assign each blob a different color to visually show the user the distinct blobs.
coloredLabels = label2rgb (labeledImage, 'hsv', 'k', 'shuffle'); % pseudo random color labels
% coloredLabels is an RGB image. We could have applied a colormap instead (but only with R2014b and later)
subplot(2, 2, 3);imshow(coloredLabels);axis on;axis image; % Make sure image is not artificially stretched because of screen's aspect ratio.
caption = sprintf('Pseudo colored labels, from label2rgb().');title(caption, 'FontSize', fontSize);drawnow;% Make measurements of bounding box.
props = regionprops(labeledImage, 'BoundingBox');% Display the image.subplot(2, 2, 4);imshow(binaryImage, []);axis on;axis image;title('Binary Image with Boxes', 'FontSize', fontSize, 'Interpreter', 'None');% Display the bounding boxes around them.
hold on;for k = 1 : numBlobs thisBoundingBox = props(k).BoundingBox rectangle('Position', thisBoundingBox, ... 'EdgeColor', 'c', 'LineWidth', 2);end
Of course. Yes, that is correct. As you probably know, the centroid is only guaranteed to be inside the shape if the shape is convex. For some arbitrarily irregular shape, the centroid may be inside or outside the shape. Are you just stating a fact for others who may not know this, or do you have a question?
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