How can I mirror a face image?

I want to mirror a face image by matlab, how can I do it? For example imagine that we split our face image by a vertical line and we want to mirror this 2 parts!what is the code?

Answer 1

[Image Analyst]

See code below to produce this image:

% Demo to mirror an image down the middle.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 22;

% Read in a standard MATLAB color demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'peppers.png';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % 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.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
rgbImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 3.
[rows, columns, numberOfColorBands] = size(rgbImage);
% Display the original color image.
subplot(2, 2, 1);
imshow(rgbImage);
title('Original Color Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);

% Get a flipped version
flippedRGBImage = fliplr(rgbImage);
subplot(2, 2, 2);
imshow(flippedRGBImage);
title('Mirrored Color Image', 'FontSize', fontSize);

% Replace right half with with right half of flipped image.
midColumn = ceil(columns/2);
outputImage = rgbImage; % Initialize
outputImage(:, midColumn:end, :) = flippedRGBImage(:, midColumn:end, :);
subplot(2, 2, 3);
imshow(outputImage);
title('Final Color Image', 'FontSize', fontSize);

Note that if you have an old version you're going to have to use a different function that fliplr() since that was only changed to handle color images with the R2014a version.

Feel free to adapt as needed to fit your situation.