Convert AVI file to series of images

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NS
NS 2012-3-10
评论： Image Analyst 2023-4-3
Hi all,
I have a AVI file that was formatted in MATLAB. I wish to convert it to a series of tif images. I am not able to do this in imageJ. Is it possible?
NS

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采纳的回答

Chandra Kurniawan
Chandra Kurniawan 2012-3-11
Hi,
This is the simpler version :
obj = mmreader('rhinos.avi');
vid = read(obj);
frames = obj.NumberOfFrames;
for x = 1 : frames
imwrite(vid(:,:,:,x),strcat('frame-',num2str(x),'.tif'));
end
You can use your own video by replacing 'rhinos.avi' with your own.
I hope this works!
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Farhan Ferdous
Farhan Ferdous 2017-7-6
which directory will I get the images?
Image Analyst
Image Analyst 2017-7-6
He did not specify a folder, unfortunately, so the images will go into the current folder, the same one as the m-file.

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更多回答（3 个）

Elijah Galbreath
Elijah Galbreath 2021-6-30
outputFolder = uigetdir(path);
% Read in the video
viddir = uigetdir(path);
viddir = fullfile(viddir,'test.avi');
obj = VideoReader(viddir);
vid = read(obj);
% Number of frames
frames = obj.NumFrames;
for x = 1 : frames
%Create a filename
outputBaseFileName = sprintf('Frame %4.4d.png', x);
outputFullFileName = fullfile(outputFolder, outputBaseFileName);
imwrite(vid(:,:,:,x), outputFullFileName, 'png');
end
Image Analyst
Image Analyst 2012-3-11
See my code for doing that here: http://www.mathworks.com/matlabcentral/answers/30847-how-save-frames-that-exit-from-video-in-a-specific-folder
Here are the key lines:
outputFolder = 'c:/users/whatever'; % Change this!
% Read in the movie.
mov = aviread(movieFullFileName);
% Determine how many frames there are.
numberOfFrames = size(mov, 2);
for frame = 1 : numberOfFrames
% Extract the frame from the movie structure.
thisFrame = mov(frame).cdata;
% Create a filename.
outputBaseFileName = sprintf('Frame %4.4d.png', frame);
outputFullFileName = fullfile(outputFolder, outputBaseFileName);
% Write it out to disk.
imwrite(thisFrame, outputFullFileName, 'png');
end
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Gaia Gbola
Gaia Gbola 2020-3-5
Hello, I am using the DEMO imaging version for MATLAB, but your code seems not to run on it, it does not recognize the function aviread. Is it possible that is because of the version that I have?
Image Analyst
Image Analyst 2020-3-5
aviread() is a really old function and it may have been removed by now. You'll need to replace it with VideoReader. See attached demos for help and examples.

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Sushil Sharma
Sushil Sharma 2019-9-23
编辑：Sushil Sharma 2019-9-23
Upadte answer
In the lestest veriosn of matlab, we have to use VideoReader instead of mmreader,then you are able to convert any video file into a frames
Here the simple of code to get the frames
%% Change .avi format to images frames
obj = VideoReader('test2.avi');
vid = read(obj);
frames = obj.NumberOfFrames;
for x = 1 : frames
imwrite(vid(:,:,:,x),strcat('frame-',num2str(x),'.png'));
end
  2 个评论
William Thielicke
William Thielicke 2023-4-3
... but there is no other way than the frame-by-frame read and write? This is really slow... I am capturing data with the imaq toolbox. RAM is too small, so I am logging to disk. But I need to have individual TIFF images. Converting on a frame-to-frame basis is extremely slow with 12 bit uncompressed grayscale data...
Image Analyst
Image Analyst 2023-4-3
@William Thielicke that reads the whole video into RAM and then writes out to disk one frame at a time. That's probably as fast as it can go. It's probably the call to imwrite() that is taking the time. I assume you're using SSD for your drive. You might try using a ramdisk instead of your SSD to save your individual files.
https://www.makeuseof.com/tag/ram-drives-faster-ssds-5-things-must-know/

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