MATLAB: Add a background image to the existing image.

animationbackground

clear all
close all
background = imread('background.jpeg')
background = rgb2gray(background)
imshow(background)
load Angle.mat;
for i=1:3
    A=angle(i,:);
    I = imread('hex08.jpg');
    I = rgb2gray(I);
    J = imrotate(I,A);
    pause(0.1)
    imshow(J);
    imwrite(J,['hex08',num2str(i),'.jpg'])
end

Above is my code, I basically want to make an animation which rotated one original picture(hex08) to form a image series and then create a avi. I now need to add a background to my avi. so the background won't move.

Is there anyway I can do that?

Thank you very much for helping.

Best Answer

Try this:

background = imread('onion.png');
background = rgb2gray(background);
imshow(background)
angles = 70:30:360;
grayImage = imread('cameraman.tif');
% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
  % It's not really gray scale like we expected - it's color.
  % Convert it to gray scale by taking only the green channel.
  grayImage = grayImage(:, :, 2); % Take green channel.
end
% Resize background
background = imresize(background, [rows, columns]);
for k = 1 : length(angles)
  % Rotate the image.
  rotatedImage = imrotate(grayImage, angles(k), 'crop');
  % Get a mask.
  mask = rotatedImage == 0;
  mask = bwareafilt(mask, 4);
  % Replace black background with image
  rotatedImage(mask) = background(mask);
  pause(0.6)
  imshow(rotatedImage);
  % Make background the same si
  %     imwrite(J,['hex08',num2str(i),'.jpg'])  
end

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MATLAB: Why imfill resul is a white figure

Your image had a white frame/border around it. Use imclearborder() to get rid of that. See corrected code:

clc;    % Clear the command window.
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% Enlarge figure to full screen.
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MATLAB: Help with regionprops in order to draw boundary

There were lots of fixes that needed to be made. Here is the fixed code:

% Initialization steps.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
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format long g;
format compact;
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% Display the image.
subplot(3, 3, 1);
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[rows, columns, numberOfColorChannels] = size(grayImage);
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% 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.
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% Give a name to the title bar.
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[pixelCount, grayLevels] = imhist(grayImage);
subplot(3, 3, 3); 
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grid on;
title('Histogram of original image', 'FontSize', fontSize, 'Interpreter', 'None');
xlabel('Gray Level', 'FontSize', fontSize);
ylabel('Pixel Count', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.
% threshold = graythresh(grayImage); % Bad for a JPG image
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% Get rid of small blobs
mask = bwareaopen(mask, 50);
subplot(3, 3, 3);
imshow(mask);
axis on;
[labeledImage, numberOfRegions] = bwlabel(mask);
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hold on
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  rectangle('Position',props(n).BoundingBox, 'EdgeColor','r', 'LineWidth',2)
end
hold off
% Crop regions and save them.
folder = 'C:\SegmentedCharacters';
for n = 1 : numberOfRegions
  croppedImage = imcrop(mask, props(n).BoundingBox);
  subplot(3, 3, n+3);
  imshow(croppedImage);
  axis on;
  % Save to disk
  baseFileName = sprintf('figure %d.png', n);
  fullFileName = fullfile(folder, baseFileName)
  imwrite(croppedImage, fullFileName);
end

Best Answer

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MATLAB: Why imfill resul is a white figure

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