从 Matlab 中的图像序列创建视频

Question

I am stuck on how to create an video file from from a sequence of images.

I have a folder with images as follows:

image01.png 
image02.png 
... 
image150.png

How do I combine them to a video in Matlab?

I saw this link explaining it, but I could not understand it exactly.

Answer 1

You may want to do something like this:

nImage = 150;                                                        % L1
fps = 3.0;                                                           % L2
addToInFolder = 'Address\to\Input\Images\Folder';                    % L3
addToOutFolder = 'Address\to\Output\Video\Folder';                   % L4

oVideo = VideoWriter(fullfile(addToOutFolder, 'myVideo.avi'));       % L5
oVideo.FrameRate = fps;                                              % L6
open(oVideo)                                                         % L7
for i = 1:nImage                                                     % L8
    fname = ['image' num2str(i, '%.2d') '.png'];                     % L9
    curImage = imread(fullfile(addToInFolder,fname));                % L10
    writeVideo(oVideo, curImage);                                    % L11
end                                                                  % L12
close(oVideo)                                                        % L13

Since you could not follow the example, here is a break down of what is going on per line:

• L1 => Total number of images which based on your file names is 150
• L2 => Frame per second of the movie you are making
• L3 => Address to the input folder of your images
• L4 => Address to the output folder for your movie
• L5 => Create a complete address to the output movie (.avi) file and make a video file at this address to be written
• L6 => Set frame rate of the movie to fps . FrameRate is a property of a video object. See this page for the complete list of properties you can play with. There are properties you may want to play with like Quality , Duration , CompressionRatio , etc).
• L7 => Video file needs to be opened to allow for writing data, otherwise you do not have the permission to write to this file
• L8 => Let's begin a loop over each image and make a frame out of it
• L9 => Create a string of file name for the current image (image01.png, ...., image150.png)
• L10 => Read the png file and store its data in variable curImage
• L11 => Add contents of curImage to the video file pointed by oVideo
• L13 => Don't forget to close the video file ( oVideo ) that was opened before