Hi, I need to change the boundary pixel into value ('2') of my binary image, How can I do this?. After that, I need to do some operation on the internal line (junction). Thanks
MATLAB: How to change pixel value of boundary pixel
image processing
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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 long g;format compact;fontSize = 20;%===============================================================================
% Read in a standard MATLAB gray scale demo image.
folder = pwd;baseFileName = 'PAR1_1.jpg';% Get the full filename, with path prepended.
fullFileName = 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; endendrgbImage = 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(rgbImage);% Display the image.
subplot(2, 2, 1);imshow(rgbImage, []);title('Original Color Image', 'FontSize', fontSize, 'Interpreter', 'None');% 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') grayImage = rgb2gray(rgbImage);binaryImage = imfill(grayImage ~= 255, 'holes');binaryImage = bwareafilt(binaryImage, 1); % Extract only the largest.
% Display the image.subplot(2, 2, 2);imshow(binaryImage, []);title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');labeledImage = bwlabel(binaryImage);props = regionprops(labeledImage, 'BoundingBox');% Crop the image
croppedImage = imcrop(grayImage, props.BoundingBox);% Display the image.subplot(2, 2, 3:4);imshow(croppedImage, []);title('Cropped Image', 'FontSize', fontSize, 'Interpreter', 'None');
Suppose the 148*114 image is named image2. Then
image2_3d = cat(3, image2, image2, image2);Then image2_3d will be the same dimension as your 148 * 114 * 3 image.
Note: given your description of what you need to do, I think you will find that this does not do anything useful for you, but it will at least give you two images "of the same dimension" that you can use to get to the point of understanding yourself why that isn't what you need.
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