Try this:
% Demo by Image Analyst
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear all;
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 16;
%===============================================================================
% Get the name of the image the user wants to use.
baseFileName = 'prova2.jpg';
folder = pwd;
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;
end
end
%=======================================================================================
% Read in image.
rgbImage = imread(fullFileName);
% Get the dimensions of the image.
[rows, columns, numberOfColorChannels] = size(rgbImage)
% Display image.
subplot(3, 1, 1);
imshow(rgbImage, []);
impixelinfo;
axis on;
caption = sprintf('Original RGB Image\n%s', baseFileName);
title(caption, 'FontSize', fontSize, 'Interpreter', 'None');
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
% Set up figure properties:
% Enlarge figure to full screen.
g2 = gcf;
g2.WindowState = "maximized";
% 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;
%=======================================================================================
% Read in template/mask image.
fullFileName = fullfile(folder, 'prova2 mask.png');
maskImage = imread(fullFileName);
% Get the dimensions of the image.
[rows, columns, numberOfColorChannels] = size(maskImage);
% Make sure it's binary.
if numberOfColorChannels > 3
maskImage = maskImage(:, :, 1) > 0;
else
maskImage = maskImage > 0;
end
% Display image.
subplot(3, 1, 2);
imshow(maskImage, []);
impixelinfo;
axis on;
caption = sprintf('Mask Image');
title(caption, 'FontSize', fontSize, 'Interpreter', 'None');
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
%--------------------------------------------------------------------------------------------------
% Get the bottom part of the image
midRow = floor(rows / 2);
rgbImage2 = rgbImage(midRow:end, :, :);
mask2 = maskImage(midRow:end, :);
% Split up into individual color channels.
[r2, g2, b2] = imsplit(rgbImage2);
%--------------------------------------------------------------------------------------------------
% Get the mean RGB of the bottom half of the image outside of the mask
meanR = mean(r2(mask2));
meanG = mean(g2(mask2));
meanB = mean(b2(mask2));
%--------------------------------------------------------------------------------------------------
% Split up into individual color channels.
[r, g, b] = imsplit(rgbImage);
% Make everywhere outside the mask that color.
r(~maskImage) = meanR;
g(~maskImage) = meanG;
b(~maskImage) = meanB;
% Reconstruct RGB image.
rgbImage3 = cat(3, r, g, b);
% Display image.
subplot(3, 1, 3);
imshow(rgbImage3, []);
impixelinfo;
axis on;
title('Background-replaced Image', 'FontSize', fontSize, 'Interpreter', 'None');
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
drawnow;
