make video to combine two png series from different file folder

Hello,

i would like to combine two png series from different file folder and make video

for example: below I attached screenshot of the png folders of pressure and velocity. I would like to make a video to combine pressure and velocity.

thank you in advance

Yijun

Answer 1

[Akira Agata]

How about the following solution?

s = dir('*.png');

v = VideoWriter('output.avi');
open(v);

for kk = 1:numel(s)
    filePath = fullfile(s(kk).folder,s(kk).name);
    I = imread(filePath);
    writeVideo(v,I);
end

close(v);

[yijun guo]

thank you for your answer. But I would like to combine velocity and pressure in one video.like left part of the video is the velocity png and right part of the video is pressure png. Is it possible with matlab?

[Image Analyst]

Combine the images side by side like this

pressureImage = imread(filePathP);
velocityImage = imread(filePathV);
bothImages = [pressureImage, velocityImage];
writeVideo(v, bothImages);

[Akira Agata]

Hi Image Analyst-san,

Thank you for your comment!

[yijun guo]

Thank you for your help. I have implemented as following. But I got an error, due to different size of image. (size of F_IR: 440X1075X3 unit8 | size of F_OR 439X1073X3). I am sure I have both the same number of element of pngs in both folders. Could you please tell me how I change the size of my image? Thank you

cd F_xy_IR

FIR = dir('*.png');

cd ..

cd F_xy_OR

FOR = dir('*.png');

v = VideoWriter('output.avi');

open(v);

for kk = 1:numel(s)

filePath_IR = fullfile(FIR(kk).folder,FIR(kk).name);

filePath_OR = fullfile(FOR(kk).folder,FOR(kk).name);

%I = imread(filePath);

%writeVideo(v,I);

F_IR = imread(filePath_IR);

F_OR = imread(filePath_OR);

bothImages = [F_IR, F_OR];

writeVideo(v, bothImages);

end

close(v);

>> video_F_IROR

Error using horzcat

Dimensions of arrays being concatenated are not consistent.

Error in video_F_IROR (line 17)

bothImages = [F_IR, F_OR];

[Akira Agata]

You can simply adjust the image size just before combining them, like:

...
F_IR = imread(filePath_IR);
F_OR = imread(filePath_OR);
F_OR = imresize(F_OR,size(F_IR,[1,2])); % <- Added this line
bothImages = [F_IR, F_OR];
...

[yijun guo]

thank you for you help. It works

best regards

Yijun