how to provide video (Heigh x Width x frames)

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.

[Image Analyst]

Search the tag keyframes

Answer 1

[Image Analyst]

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().

Answer 2

[Youssef Khmou]

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 ?

[Ren]

the input is the video to work with from this video i have to generate 3d array x-y-t

[Image Analyst]

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]

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]

Thanks it works now