Is there a way to overlay a graph onto a video, plotting each successive point with each frame?

Reposted since the previous post didn't get resolved!

Hi folks,

I have a script that creates a video from image files, as below:

for i = 1 : numFolders
    RawImages = [vidFolders(i).folder '\' vidFolders(i).name];
    videoName = [RawImages '\' vidFolders(i).name '.avi'];
    addpath(RawImages);
    imageFolder = [RawImages '\Images\'];
    files = dir([imageFolder '*.tif']);
    numImages = length(files);    
    if ~isfile(videoName)
        writerObj = VideoWriter(videoName);
        writerObj.FrameRate = 10;
        open(writerObj);     
        for j = 1:numImages
            imagePath = [imageFolder files(j).name];
            image = imread(imagePath);
            image = image(:,:,1:3);
            frame = im2frame(image);
            writeVideo(writerObj, frame);
        end
        close(writerObj);
    end
end

Each frame of the video is a temperature increment of 1 degree. For each video created, there is a plot that describes the video, as such:

where each point along the line is a degree increment, as with each frame in the video.

My question is: can I overlay the graph onto the video, such that the plot evolves with each frame? In other words, can I append the graph to the video and have the line extend along the X axis with each frame of the video?

I have tried videofig from the File Exchange and I can't get it to work as per:

type redraw;
vid = VideoReader('rhinos.avi');
videofig(vid.NumFrames, @(frm) redraw(frm, vid));
redraw(1, vid);

function redraw(frame, vidObj)
f = vidObj.read(frame);
f2 = edge(rgb2gray(f), 'canny');
f3 = bsxfun(@plus, f,  uint8(255*f2));
image(f3); axis image off
end

Answer 1

[Walter Roberson]

Using the videofig() calls you show worked fine for me. Just make sure you get https://www.mathworks.com/matlabcentral/fileexchange/29544-figure-to-play-and-analyze-videos-with-custom-plots-on-top and not https://www.mathworks.com/matlabcentral/fileexchange/84028-preview-and-play-video-files

The shortcut to start the playing is to press return while focused on the figure. But if you need to automate, then after you run videofig, then

timers = timerfind();
start(timers(end));      %should start the playing

Answer 2

[yanqi liu]

for i = 1 : numFolders
    RawImages = [vidFolders(i).folder '\' vidFolders(i).name];
    videoName = [RawImages '\' vidFolders(i).name '.avi'];
    addpath(RawImages);
    imageFolder = [RawImages '\Images\'];
    files = dir([imageFolder '*.tif']);
    numImages = length(files);    
    if ~isfile(videoName)
        writerObj = VideoWriter(videoName);
        writerObj.FrameRate = 10;
        open(writerObj);     
        for j = 1:numImages
            imagePath = [imageFolder files(j).name];
            image = imread(imagePath);
            image = image(:,:,1:3);
            % add line
            image = insertShape(image,'line',[1 1 size(image,2) size(image,1)],'LineWidth',2);
            frame = im2frame(image);
            writeVideo(writerObj, frame);
        end
        close(writerObj);
    end
end