Matlab source code for file selection

I am doing a project on Video Compression. My problem is that i have a folder named "Snaps" that contains all the frames of the video. I want to select a number of sequential files having a certain interval and save those files into another folder named "Newsnaps". Can anyone please help me with the source code on this matter??

Answer 1

[Marta Salas]

Hi,

If I understood correctly you want to read the files from the folder Snaps, subsample them and then save them on a new folder called NewSpnas.

video_dir = 'snaps/'
extension = 'jpg'
out_dir = 'Newsnaps/'
step = 2 % this parameter decide which frames to save

resnames=dir(fullfile(video_dirs,['*.' extension]));
for i=1:step:length(resnames)
    img=imread(fullfile(video_dirs,resnames(i).name));
    imwrite(img, [out_dir resnames(i).name]);
end

Answer 2

[Nitin]

This should get you started on selecting the sequential frames:

   % The following will give the lengths of the consecutive sequences of your vector:

          a=diff(frame_number);

          b=find([a inf]>1);

          c=diff([0 b]); % length of the sequences

          d=cumsum(c); % endpoints of the sequences

         % Choose frames with highest number of consecutive frames 

          ind5 = max(c);

          if length(ind5)> 1

              ind5 = ind5(1);

          end

          % Proceed only if the number of consecutive frames is greater >
          % length consecutive frames

          if ind5>=length_cons_frames

          ind6 = find(c==ind5);

          end_point = d(ind6);