Converting Structure into 3d Matrix

Hi,

I am trying to post-process matrix of frames I get from a camera. Each frame is outputted as a.mat file with a "Frame" variable that is a 512x640 double. I want to import all of these files for each frame, I have 2497 frames so 2497 files, and create a 3D matrix that is 512x640x2497 with all the frames. I currently import the frames but it creates a 1x2497 strucutre with each field being a 512x640 double. Is it possible to convert this structure to a 3D matrix or import the data straight into a 3D matrix?

Thank you

This is my code so far:

for k = 0:2497
  filename = sprintf('Rec--000013_%d.mat', k);
  
  %Checking File Exists
  if isfile(filename)
		all_frames(k+1) = load(filename,'Frame');
	else
		fprintf('File %s does not exist.\n', filename);
	end
  
  fprintf('Now Reading File : Rec--000013_%d.mat\n', k)
   
end

Answer 1

[Matt J]

Matrix=cat(3, all_frames.Frame);

However, you will need generous RAM. Your all_frames structure already consumes about 5 GB in double flating point, and this will consume another 5 GB.

[Afonso Espírito Santo]

Hi Matt,

Thank you so much for this. It works perfectly. My goal is to get these frames playing as a video. I intended on converting each index into an image and getting the images to play at 10 fps but I am not managing. Do you have any sugegstion on how to approach this?

This is my current solution:

frames_matrix = cat(3, all_frames.Frame);

%Converts Matrix into Images
for i = 1:2497
images(k) = image(frames_matrix(k));
end


%Create the Video Writer With 10 FPS
 writerObj = VideoWriter('13.avi');
 writerObj.FrameRate = 10;
   %Open the Video Writer
   open(writerObj);
   %Write the Frames to the Video
    for u=1:2498    
       %Convert the Image to a Video Frame
       frame = im2frame(images(u));
       writeVideo(writerObj, frame);
   end
   %Close the Writer Object
   close(writerObj);
   implay('13.avi');

[Matt J]

Since you Accept-clicked the answer, I assume you figured it out?

[Afonso Espírito Santo]

Hi Matt,

The original issue was solved.However, I have not figured out how to answer the question I asked in the comment. Should I open a new questions for that specifically?

Thanks!