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how to provide video (Heigh x Width x frames)

Asked by Ren on 19 May 2013

Hi, i'm working in the spatio temporel interest point, and in order to detect the keypoints , the video have to be matrice (Height x Width x frames) How can i do it? Thank you.

1 Comment

Image Analyst on 19 May 2013

Search the tag keyframes

Ren

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2 Answers

Answer by Image Analyst on 19 May 2013

I'm not sure what you're asking. You can provide video by using a video camera to create a video that is stored in a file. Or you can create one manually from a bunch of frames and using the im2frame() function. Or you can "provide" one to your program (i.e. put into a variable in your program) by using VideoReader class, or mmreader(), or avireader().

0 Comments

Image Analyst
Answer by Youssef KHMOU on 19 May 2013

hi Ren,

i think you have to explain a little more your situation, are you working on existing Video or image sequences ? or you want to generate such 3d array ?

4 Comments

Image Analyst on 19 May 2013

Is it from a video camera, or a disk file? What is x, y, and the number of frames? Presumably it's different than what you desire so you're going to have to call imcrop() for each frame.

Youssef KHMOU on 19 May 2013

you can use "aviread" function, next you extract the dimensions from that structure , and you create a 3d matrix A(x,y,t).Using a loop on the third dimension, you can affect each frame to A .

Ren on 19 May 2013

Thanks it works now

Youssef  KHMOU

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