Extraction of images from video: why images are missed?
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Emerson De Souza
le 13 Mar 2013
Commenté : Akhilkumar1307
le 20 Mar 2017
INTRODUCTION:
I have a avi-video recorded at 2 frames per second and I used the following commands to extract the images of the video:
obj = VideoReader('C:\Desktop\test.avi');
vid = read(obj,[1 5000]);
for k = 1:1:5000
newname = strcat('C:\Desktop\TEST\',num2str(k),'.png');
imwrite(vid(:,:,:,k), newname);
end;
PROBLEM:
I controlled the extracted images and realized that one image is missed at every sixth image or 20 images per minutes. Instead of counting 120 images per minute I counted only 100.
I wonder if someone knows what is going wrong with the commands and what I can do to solve this problem.
Thank you in advance Emerson
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Réponse acceptée
Image Analyst
le 13 Mar 2013
Add k to your loop to display it:
for k = 1:5000
k % No semicolon.
newname = strcat('C:\Desktop\TEST\',num2str(k),'.png');
imwrite(vid(:,:,:,k), newname);
end
Now, do you see any missing k in the list printed to the command line?
10 commentaires
AJ
le 13 Juin 2013
Hi Image Analyst, I have a problem , when I am using your code to extract individual frames from a video, I am only able to extract 80 frames from the total number of frames. Kindly help me.
Plus de réponses (2)
Shaun VanWeelden
le 13 Mar 2013
Also, I would do obj.FrameRate to see if it really is 2, this seems much more likely than a number not showing up in a vector.
Akhilkumar1307
le 8 Mar 2017
Hi
I am facing similar problem too
My video frame rate is 30 fps, so it should show me a frame every 33(1000/30) millisecond but its not Its showing around a frame every 400 millisecond
please help
1 commentaire
Akhilkumar1307
le 20 Mar 2017
Problem is solved
Previously am using .avi files, and know its fine with .mp4 files
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