Creating sill image animation

Hello everyone!

I have a project in matlab : to make an animation video from one source image.

My idea for solving this problem includes those steps :

1) Seperate foreground and background from each other (using image segmentation methods).

2) Fill the background with color - in the area of the segmented foreground.

3) Blend the foreground and backround images in a for loop. Which in every iteration the foreground moves a little from his last location (for now is is not important what is the direction - I assume that the user will decide ).

I am new in matlab and threfore I am having trouble doing this -the idea is clear but writing the code is not simple for me.

I need some examples if you have and want to share.

Thanks you all!

Answer 1

[VINAYAK LUHA]

Hi David,

I understanding that you want to create a still image animation in MATLAB.

Here are few pointers to help you implement the steps you mentioned:

1. For separating the background, you may use MATLAB’s “Image Segmenter” or “Color Thresholder” app or programmatically make use of a variety of other custom image segmentation methods.
2. For changing the background color, you can modify the individual (R, G, B) values of the image or add another image of same dimension to the background.
3. Similarly for blending the background image with the foreground image you can follow step 2 and for translating the foreground on the colored background you may shift the foreground image circularly using “circshift” function.

Examples of how to implement the above 3 steps can be seen in the code snippet below:

% Load the foreground and the background images 
foreground = imread('foreground.png');  
background = imread("background.png"); 

%Filling the background image with some color
rgb =[125,125,125]; 
background(:,:,1) = rgb(1); 
background(:,:,2) = rgb(2); 
background(:,:,3) = rgb(3); 

%Blend the foreground and the background images in loop 
numFrames = 180; 
foregroundOffset = 15;  
videoFile = VideoWriter('wave.mp4', 'MPEG-4'); 
videoFile.FrameRate = 60;  
open(videoFile); 

for frame = 1:numFrames 
    offset = frame * foregroundOffset; 
    shiftedForeground = circshift(foreground, [0,offset]); 
    blendedImage = (double(shiftedForeground) + double(background)) ./ 2; 
    writeVideo(videoFile, uint8(blendedImage)); 
end 
close(videoFile); 

To learn more about more image segmentation techniques and “circshift ”, you may refer to the MathWorks documentation links below:

1. https://www.mathworks.com/discovery/image-segmentation.html
2. https://www.mathworks.com/help/matlab/ref/circshift.html

Hope this helps.

Regards

Vinayak Luha