3D matrix to Video

조회 수: 98(최근 30일)
Andrew Chen
Andrew Chen 2017년 2월 24일
댓글: Guangxu Li 2020년 5월 9일
Hello all, I have been having a lot of trouble trying to export a video from Matlab from a 3D matrix. The matrix dimensions indicate frame height, width and frame number. The element values are what is being used to form images with commands such as imagesc or imshow. I can create a video in Matlab by putting the imshow or imagesc command in a for loop but I want to extract something equivalent from Matlab to put in youtube or imbed in a powerpoint or soemthing. Here's an example of the situation:
IM % an mxnxz matrix
for i = 1:size(IM,3);
imshow(IM(:,:,i))
pause(.001);
end
Since the matrix has no color information after processing I have run into problems using WriteVideo or im2frame command. Thanks for any help.

채택된 답변

Stephen23
Stephen23 2017년 2월 24일
편집: Stephen23 2017년 2월 24일
It is easy to use getframe and videoWriter object. Here is an example from the videoWriter object help:
v = VideoWriter('peaks.avi');
open(v);
Generate initial data and set axes and figure properties.
Z = peaks;
surf(Z);
axis tight manual
set(gca,'nextplot','replacechildren');
Create a set of frames and write each frame to the file.
for k = 1:20
surf(sin(2*pi*k/20)*Z,Z)
frame = getframe;
writeVideo(v,frame);
end
close(v);
  댓글 수: 3
Andrew Chen
Andrew Chen 2017년 2월 24일
Thanks! It worked!

댓글을 달려면 로그인하십시오.

추가 답변(1개)

Guangxu Li
Guangxu Li 2020년 3월 9일
편집: Guangxu Li 2020년 5월 9일
Video to 3D image (single channel)
filename="./*.avi";
obj = VideoReader(filename);
vid = read(obj);
mImage=obj.Width;
nImage=obj.Height;
frames = obj.NumberOfFrames;
Image3D=zeros(nImage,mImage,frames,'uint8');
for x = 1 : frames
Image3D(:,:,x)=vid(:,:,1,x);
end
niftiwrite(Image3D,filename);
  댓글 수: 2
Guangxu Li
Guangxu Li 2020년 5월 9일
Dear Bahmanabasdi,
I am very sorry. Please ignore the rotation and flipud lines. That is for my case.

댓글을 달려면 로그인하십시오.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by