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Figure to play and analyze videos with custom plots on top

version 1.1.0.0 (3.79 KB) by Joao Henriques
A figure ready to scroll through and play videos. You can also draw any custom graphics on it.

13 Downloads

Updated 12 Dec 2010

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Editor's Note: This file was selected as MATLAB Central Pick of the Week

VIDEOFIG(NUM_FRAMES, @REDRAW_FUNC) creates a figure with a horizontal scrollbar and shortcuts to scroll automatically. The scroll range is 1 to NUM_FRAMES. The function REDRAW_FUNC(F) is called to redraw at scroll position F (for example, REDRAW_FUNC can show the frame F of a video).

This can be used not only to play and analyze standard videos, but it also lets you place any custom Matlab plots and graphics on top.

Jiro posted a great example on the Pick of the Week blog, along with a nice GIF animation so you can see it in motion:
http://blogs.mathworks.com/pick/2010/12/10/video-player-for-your-frame-based-processing/

EXAMPLE 1

Place this in a file called "redraw.m":
function redraw(frame)
imshow(['AT3_1m4_' num2str(frame, '%02.0f') '.tif'])
end

Then from a script or the command line, call:
videofig(10, @redraw);
redraw(1)

The images "AT3_1m4_01.tif" ... "AT3_1m4_10.tif" are part of the Image
Processing Toolbox and there's no need to download them elsewhere.

EXAMPLE 2

Change the redraw function to visualize the contour of a single cell:
function redraw(frame)
im = imread(['AT3_1m4_' num2str(frame, '%02.0f') '.tif']);
slice = im(210:310, 210:340);
[ys, xs] = find(slice < 50 | slice > 100);
pos = 210 + median([xs, ys]);
siz = 3.5 * std([xs, ys]);
imshow(im), hold on
rectangle('Position',[pos - siz/2, siz], 'EdgeColor','g', 'Curvature',[1, 1])
hold off
end


The keyboard shortcuts are:
Enter (Return) -- play/pause video (25 frames-per-second default).
Backspace -- play/pause video 5 times slower.
Right/left arrow keys -- advance/go back one frame.
Page down/page up -- advance/go back 30 frames.
Home/end -- go to first/last frame of video.

See HELP VIDEOFIG for more options.

Cite As

Joao Henriques (2019). Figure to play and analyze videos with custom plots on top (https://www.mathworks.com/matlabcentral/fileexchange/29544-figure-to-play-and-analyze-videos-with-custom-plots-on-top), MATLAB Central File Exchange. Retrieved .

Comments and Ratings (4)

how can i use this for my own plots. Lets say I have a for loop and in it my counter k goes through certain positions and and draw a plot for each position and I get the frames in a variable called M for example. in the for loop: ...............
M(k) = getframe(gcf)
end
Now I wanna use this function with the M with all the frames, how do I do that ?

Hi, I don't understand how to make this work. Could someone please explain? There's already a built in redraw.m file in matlab, am i supposed to modify that with the text in example 1? Also, how can I call my specific video so that I can play that video? where is the argument in which the user can input the path or name of the video they want to play? Thanks!

Renaud

Very Helpful function!!!
One question: Is there a way to save the processed frames into an .avi file?

Thanks!!

Iván

This is excellent!!
It's more than what I was looking for!
Thanks! =)

Updates

1.1.0.0

Added a link to Jiro's example, and rearranged the file's description a bit.

MATLAB Release Compatibility
Created with R2008b
Compatible with any release
Platform Compatibility
Windows macOS Linux
Acknowledgements

Inspired: Reader class for Photron .mraw-Files