centroiddigital image processingimage processingimage segmentationMATLAB and Simulink Student Suiteregionprops
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 long g;format compact;fontSize = 15;%===============================================================================
% Get the name of the image the user wants to use.
baseFileName = '8.jpg';% Get the full filename, with path prepended.
folder = pwdfullFileName = fullfile(folder, baseFileName);% Check if file exists.
if ~exist(fullFileName, 'file') % The file doesn't exist -- didn't find it there in that folder.
% Check the entire search path (other folders) for the file by stripping off the folder.
fullFileNameOnSearchPath = baseFileName; % No path this time.
if ~exist(fullFileNameOnSearchPath, '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; endend%===============================================================================% Read in demo image.
rgbImage = imread(fullFileName);% Get the dimensions of the image.
[imageRows, imageColumns, numberOfColorChannels] = size(rgbImage);% Display the original image.
subplot(2, 2, 1);imshow(rgbImage, []);axis on;caption = sprintf('Original Color Image, %s', baseFileName);title(caption, 'FontSize', fontSize, 'Interpreter', 'None');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;hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);greenChannel = rgbImage(:, :, 2);blueChannel = rgbImage(:, :, 3);% Threshold to get the blue mask.
blueMask = redChannel < 100 & greenChannel < 100 & blueChannel > 100;% Display the image.
subplot(2, 2, 2);imshow(blueMask);grid on;axis on;title('Initial Blue Mask Image', 'FontSize', fontSize);% Fill blobs.
blueMask = imfill(blueMask, 'holes');% Reduce to single points.
blueMask = bwulterode(blueMask);% Display the image.subplot(2, 2, 3);imshow(blueMask);grid on;axis on;title('Final Blue Mask Image', 'FontSize', fontSize);% Count points in a moving window of size 8 rows by 16 columns.
windowColumns = 16; % Adapt as needed.
windowRows = 8; % Adapt as needed.% Do the counting
countImage = conv2(double(blueMask), ones(windowRows, windowColumns));% Display the image.subplot(2, 2, 4);imshow(countImage);axis on;caption = sprintf('Count Image: count in a %d by %d moving box', windowRows, windowColumns);title(caption, 'FontSize', fontSize, 'Interpreter', 'None');drawnow;
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