Downsampling a selection of images before converting them to video

I'm trying to create an .avi file from several .tif images, due to the very large number of images and the high frame rate I need to only use every other frame so that instead of 80 fps I get 40 fps. for example if there are images named 1, 2, 3, 4, 5, 6 etc, I only need images 1, 3, 5 in the video. This is the code I'm using so far:

function tif2avi

clc; close all;
[imagelist,p]=uigetfile('*.tif','MultiSelect','on',...
     'Select LIST to plot'); pause(0.5); cd(p);
 if ~iscell(imagelist); disp('imagelist not cell'); return; end;

outputVideo = VideoWriter('0424_rat01.avi');
outputVideo.FrameRate = 80;
outputVideo.Quality = 50;
open(outputVideo);

for i=1:numel(imagelist)
    img=imread(imagelist{i});
    writeVideo(outputVideo,img);
end

Answer 1

[Chandra]

Hi,

try using "imresize" function in the "for" loop

for i=1:numel(imagelist)
    img=imread(imagelist{i});
    img = imresize(img,[1920 911]); % change the values accordingly, find the size in outputVideo using workspace or command window
    writeVideo(outputVideo,img);
end
close(outputVideo);

try to explore outputVideo from workspace and change the required values accordingly.