Make video from images

Hello !

I have about 500 pics and i'd like to make a video with. Also, i have a vector with the time each image should appear. (Img10 at tome(10))

Is it possible ?

Thank you so much, Loic.

[Matthew Eicholtz]

Yes, this should be possible. Is the frame rate constant?

Answer 1

[Image Analyst]

I was doing almost the same thing today. I'm still in the act of polishing it up, but here is a first draft that works, attached. You specify a folder of images and it builds all the images into an avi movie. You can specify the frame rate, and how many times the first slide shows up (because it might be a title slide).

You could use text() to imprint any text on the frames, such as the time or whatever.

I'm using it to make a time lapse movie of a building they're building here. It will take 3 years to finish the building. I take a picture every day that I'm there. Eventually I also want to figure out how to place each frame at the proper time, but right now it just strings them all together. Feel free to modify it though to do what you want, which will require you writing additional copies of frames in there to make sure the frame you want appears at the proper time.

[Nidhi Kumari]

can you please provide me with the code?

[Turlough Hughes]

Did you finish the timelapse??

[Image Analyst]

There have been some changes since 2016. I'm attaching the latest.

[Batuhan Buyukkoroglu]

Hi Image Analyst. I ran your code, then this window opened. But i can not convert that image sequence to a video. I took an error(Error in program makeMovie, function btnAnalyze_Callback(), at line 493. Error Message: Undefined function 'object' for input arguments of type 'char'). I tried to run this code with another image sequence, program converted that sequence to a video, but i can't play the video because of it's format. What should i do?

[Image Analyst]

That's really weird. Line 493 is a comment:

% Main processing is done by the function AnalyzeSingleImage()

and should not throw an error. Did you alter the function in any way? Look especially at the first line of the m-file - does it look normal? Please attach your m-file so I can inspect it. Or else you can extract it again to a different folder and use the file comparison utility in MATLAB to check for differences.

[Batuhan Buyukkoroglu]

In my code, 493. line is "object to write the video out to a new, different file." Can you send me the latest version sir?

[Batuhan Buyukkoroglu]

In code that i used, " Main processing is done by the function " comment is at line 471.

[Adam Rajcan]

Dear Image Analysts

I have a problem using your script. It does not allow me to change the ordering style. Using the predefined ordering style orders our images like 1,10,100,1000,1001,1002 ... Any idea how can we solve it?

Thank you for your extensive work, we have been using from your scripts for a while already.

[Image Analyst]

You'll have to call a routine to sort the items in the listbox in that way. See this link:

Filename sorting

[Kyle Uhlenhake]

I might be missing something simple, but whenever I pull up makeMovie.fig and try to select an image folder I get the following error:

Any help would be great!

Thanks

[Image Analyst]

@Kyle Uhlenhake I just ran it again and it worked find. Line 425 is this:

returnValue = uigetdir(handles.imageFolder,'Select folder');

The error message means that imageFolder is not a field of handles. That means you must have somehow modified handles, perhaps in the OpeningFcn. Try to download again and run it. Otherwise try this workaround (which is also in the code attached here).

try
    returnValue = uigetdir(handles.imageFolder,'Select folder');
catch
    returnValue = uigetdir(pwd,'Select folder');
end

If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

[atharva aalok]

@Image Analyst I am using your code for making a movie.

I have a folder with 40 png images. I want to use these to make my movie.

When I run the makeMovie.fig

After selecting the folder I get the following error messages in succession:

What could be wrong here?

(I have aleady added the following lines to the .m file at line 425 as suggested in a previous comment:

try
    returnValue = uigetdir(handles.imageFolder,'Select folder');
catch
    returnValue = uigetdir(pwd,'Select folder');
end

)

Images in my folder are named as follows:

Answer 2

[Matthew Eicholtz]

I usually use the VideoWriter class for making movies in MATLAB.

Here is some basic code structure to get you started:

video = VideoWriter('yourvideo.avi'); %create the video object
open(video); %open the file for writing

for ii=1:N %where N is the number of images
  I = imread('the ith image.jpg'); %read the next image
  writeVideo(video,I); %write the image to file
end

close(video); %close the file

Now, this assumes constant frame rate (which can be set using the video.FrameRate property). I am not aware of any built-in functionality for handling variable frame rate. But, in theory, you could hack it by repeating image frames.

For example, if your frame rate is 1 frame per second, and the time vector is something like:

t = [0 2 3 7 ...]; %times for the 1st image, 2nd image, and so forth

Then, you will want to call 'writeVideo(video,I)' 2 times for image 1, 1 time for image 2, 4 times for image 3, etc. This will be challenging if your times are not multiples of your frame rate, so watch out for that.

[Shafi Ullah]

I need a code for making video from image. The following code is not working...

[Image Analyst]

Did you look at my latest comment. That code works. Why don't you try it?

Click here for the link

[Spandana M]

Your file is too big Image Analyst....I know maybe its very detailed and would be very efficient,but I have no time to through whole of it and undertstans and then apply T.T

[Image Analyst]

madamebig, thanks, I've fixed the link, but I'm also attaching more video creating demos here.

[Nidhish Jain]

@Matthew Eicholtz I followed your code and I got the avi file. But the video is all black. I don't know what is happening. I can see the images in the video but somehow they are all filtered to black. Please let me know if you know anything about this.

[Image Analyst]

Try my code instead. If that still doesn't work, then start a new question and attach 5 of your images.

Answer 3

[Pascal Stirtzel]

Perfect, thank you very much

Answer 4

[Vikas Arora]

A small modification to @Matthew Eicholtz's answer:

% If your image file starts with image_1.png, image_2.png and so on ...
% and live in the current folder.
folder = pwd; % Or wherever you want.
video = VideoWriter('yourvideo.avi'); % Create the video object.
open(video); % Open the file for writing
N=601; % Where N is the separate number of PNG image files.
for k = 1 : N 
    I = imread(fullfile(folder, sprintf('image_%g.png', k))); % Read the next image from disk.
    writeVideo(video,I); % Write the image to file.
end
close(video); 

[atharva aalok]

The file appears but when I play it says:

"This item is in a format we don't support."

[S Ch]

@atharva aalok Read it using Windows Media.

[Image Analyst]

@atharva aalok try a different file extension, like .mp4 or .mpg or .wmv.

Answer 5

[AMIT SURYAVANSHI]

% Example data

imageFolder = 'path_to_your_images'; % Replace with the actual path to your image folder

imageFiles = dir(fullfile(imageFolder, '*.jpg')); % Change the extension based on your image format

numImages = length(imageFiles);

% Vector with time each image should appear (in seconds)

timeVector = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; % Adjust the timings as needed

% Create a VideoWriter object

outputVideo = VideoWriter('outputVideo.mp4', 'MPEG-4');

outputVideo.FrameRate = 1; % Adjust the frame rate as needed

open(outputVideo);

% Loop through each image and write it to the video

for i = 1:numImages

% Read the current image

currentImage = imread(fullfile(imageFolder, imageFiles(i).name));

% Write the current image to the video

writeVideo(outputVideo, currentImage);

% Pause for the specified time

pause(timeVector(i));

end

% Close the video file

close(outputVideo);