How to make one video out of 3 images?

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Hi folks,
I'm trying to create a single image out of 3 different images, then collate the subsequent images into a video. I'm also trying to write some text onto the middle of the 3 images, that changes with each subsequent frame. I have made the following start but am having limited luck getting it to work!
mainImg = imread([imageMainFolder imageMainFiles(j).name]);
mainImg = mainImg(:,:,1:3);
cropImg = imread([cropsFolder cropFiles(j).name]);
threshImg = im2uint8(imread([threshFolder threshFiles(j).name]));
h = figure;
h(1) = subplot(2, 2, 1);
image(cropImg, "Parent", h(1));
h(2) = subplot(2, 2, 2);
image(threshImg, "Parent", h(2));
h(3) = subplot(2, 2, 3:4);
image(mainImg, "Parent", h(3));
myText = ['Temperature = ' num2str(myTemp(j)) '$^{o}C$'];
RGB = insertText(h, [50 50], myText, 'FontSize',18,'BoxColor', 'black','BoxOpacity',1,'TextColor','white');
image(RGB, 'Parent', axes);
axes.Visible = 'off';
writeVideo(writerObj, RGB);
this is placed inside a loop for j. I close the writerObj when the loop ends.
I'm sure my syntax is wrong so I'd appreciate any advice on how to fix it!

Accepted Answer

Image Analyst
Image Analyst on 13 Mar 2022
See attached example. See the second half where I create a movie from images in a folder. The first half deals with extracting frames from an existing movie, getting the mean colors, and (optionally) saving the individual frames to disk.
With only 3 images, you'll need to adjust your FrameRate to be something like 1 or 2 seconds.
  2 Comments
Teshan Rezel
Teshan Rezel on 14 Mar 2022
@Image Analyst fantastic solution as ever, thank you!

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