splitting a video into frames using image function after using mmreader to read video file...

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Yagnaseni Roy 2011-10-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/18525-splitting-a-video-into-frames-using-image-function-after-using-mmreader-to-read-video-file

*I wasn't being able to bring an avi file into the workspace, so I brought the video into the MATLAB file and played it using implay...then I want to split it into its individual frames..

According to the solution by Walter Roberson on

http://mathworks.com/matlabcentral/answers/18413-using-getframe-to-separate-frames-from-a-video-need-easy-code#answer_24718 I put:*

n=size('cell.avi')

n =

     1     8
 for frame= 1:n
('cell.avi')(frame)=getframe;
            |
But I get_ :Error: Unbalanced or unexpected parenthesis or bracket.
_
image function!!*

Now I want the individual frames as individual images, so I put: image(('cell.avi')(1).cdata) image(('cell.avi')(1).cdata) | *Error: Unbalanced or unexpected parenthesis or bracket. * *What is wrong? I've been able to load the movie, but now I can't split it into the frames using

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Walter Roberson 2011-10-17

I never wrote that code!

Yagnaseni Roy 2011-10-17

I meant mage(fractogene(117).cdata)...you suggested this

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采纳的回答

Image Analyst 2011-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/18525-splitting-a-video-into-frames-using-image-function-after-using-mmreader-to-read-video-file#answer_24886

在 MATLAB Online 中打开

Look at the help for mmreader() . . . again . . . more carefully this time. You'll see read() does not take a string, it take the movie object, and the number of the frame you want to read. So instead of

video = read('cell.avi');

you'd want

% Read from ii from movie M
oneFrame = read(M, ii);

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Yagnaseni Roy 2011-10-19

Btw,

referring to M = mmreader('cell.avi');

N = M.NumberOfFrames;

for ii = 1:N

image(M.read(ii));

pause(0.1);

end

HOW WOULD I CALL FOR AN INDIVIDUAL FRAME...SUPPOSE FRAME 5?? i TRIED image(M.read(5));

...IS THIS NOT SUPPOSED TO WORK?

Yagnaseni Roy 2011-10-19

Doing this, I seem to get the last frame each time...even when I change to image(M.read(6));image(M.read(20));....they all look the same.

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更多回答（2 个）

Sean de Wolski 2011-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/18525-splitting-a-video-into-frames-using-image-function-after-using-mmreader-to-read-video-file#answer_24859

在 MATLAB Online 中打开

n=size('cell.avi')

will say that n = [1 8] since 'cell.avi' is an eight letter long string (row vector of characters).

Here's probably closer to what you want:

M = aviread('rhinos.avi');
for ii = 1:length(M)
 image(M(ii).cdata)
 pause(.1)
end

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Yagnaseni Roy 2011-10-17

Apparently, 'cell.avi' is a 8 character string and none of the functions are working on it..

Walter Roberson 2011-10-18

M = mmreader('cell.avi');

N = M.NumberOfFrames;

for ii = 1:N

image(M.read(ii));

pause(0.1);

end

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Dimple Chawla 2012-4-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/18525-splitting-a-video-into-frames-using-image-function-after-using-mmreader-to-read-video-file#answer_44739

hey, it really helped me too, actually i'm working on similar project like calculating difference of object property in frame such as 1st and the 20th or the last frame. Can u help on this.?? I will deftly appreciate your effort. Thanks reply asap