Frame of Animated Gif

Ju
2012 1 15
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Hi, all. I want to make a steganography program using LSB in matlab. I use animated GIF for the cover object. As we know that Animated GIF is a file that consists of many images. So, can anyone tell me: How to get the frame number of this file in matlab? Thanks before.

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Jan
Jan 2012-1-15
Please explain again, what you want to get? The number of images an animated GIF consists of?
Ju
Ju 2012-1-23
i want to get the nnumber of frames and put it in a variable..

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Walter Roberson
Walter Roberson 2012-1-16

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http://www.mathworks.com/help/techdoc/ref/imread.html#f25-722074
Read all of the frames using imread(), and then look at the size of what is returned.

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Jan
Jan 2012-1-16
Then "get the frame number" is equivalent to "get the number of frames" - correct? Actually a question, which should be answered by the OP...

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Ju
Ju 2012-1-23

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Thanks for your answer and comments. But, i'm still confuse about it. Can you tell me with an example in source code, how to get the number of frames and put it in a variable?

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Walter Roberson
Walter Roberson 2012-1-23
allframedata = imread('YourFile.GIF', 'frames', 'all');
alldimensions = size(allframedata);
number_of_frames = alldimensions(end);
Ju
Ju 2012-1-23
thank you very much. You help me a lot.

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