Downsampling a selection of images before converting them to video

Question

Guglielmo Sonnino Sorisio 2022-5-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1710015-downsampling-a-selection-of-images-before-converting-them-to-video

回答： Chandra 2022-5-5

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

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Answer 1

Chandra 2022-5-5

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1710015-downsampling-a-selection-of-images-before-converting-them-to-video#answer_957445

在 MATLAB Online 中打开

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);