How to make movies in MATLAB?

my instructor required me to make a movie of my life using MATLAB, i have pictures but i don't know how to import them or make them a slide show. can anybody help me with this? thanks God Bless :)

Answer 1

[Geoff Hayes]

Mark - use imread to read in the individual images. Depending upon the number, you may want to code up a for loop to read each image from a directory/folder. All images will need to be of the same size (height and width will need to be the same for each image), so you may need to resize each. If you have the Image Processing Toolbox, you can use imresize to do this.

To create the video, use the videowriter. From their second example you could do something like

 % create video writer object
 writerObj = VideoWriter('myLife.avi');

 % set the frame rate to one frame per second
 set(writerObj,'FrameRate',1);

 % open the writer
 open(writerObj);

 % iterate over each image
 for k=1:numImages

     % use imread to read the image
     img = imread(...);

     % resize the image
     img = imresize(img,...);

     % convert the image to a frame using im2frame
     frame = im2frame(img);

     % write the frame to the video
     writeVideo(writerObj,frame);
 end

 % close the writer
 close(writerObj);

Each image needs to be converted to a frame before writing it to file. We use im2frame to do this.

The above isn't tested but should give you a good starting point.

Answer 2

[Image Analyst]

See the FAQ http://matlab.wikia.com/wiki/FAQ#How_can_I_create_a_movie_from_my_MATLAB_figures.3F

In addition, see the demo I've attached.

[Victoria Boatwright]

I just used your demo for my own plots and it was super helpful! I'm wondering if there is a way to grab the image in the figure as well as any axis titles and colorbars (aka the entire window that shows in the pop-up figure)? Thank you so much!

[Image Analyst]

@Victoria Boatwright, if you want to write out each individual frame to the drive, you can insert this code into the loop:

%------------------------------------------------------------------------------------------------------------------------------------------
		% OPTIONAL - ONLY IF YOU WANT TO SAVE EXTRACTED FRAMES.
		% Write the image array to the output file, if requested.
		if writeToDisk
			% Construct an output image file name.
			outputBaseFileName = sprintf('Frame %4.4d.png', frame);
			outputFullFileName = fullfile(outputFolder, outputBaseFileName);
			
			if hasComputerVisionToolbox
				% User has the Computer Vision Toolbox
				% so we can use insertText() to burn frame stamp into image, if desired.
				if wantsFrameStamps
					thisFrame = insertText(thisFrame, [5, 5], caption, 'FontSize', 20, 'TextColor', 'yellow', 'BoxColor', 'black'); % Burn text into image
				end
				imwrite(thisFrame, outputFullFileName) % Original size image
			else
				% No Computer Vision Toolbox, so can't use insertText().  Must use text() instead.
				if wantsFrameStamps
					% Stamp the name and frame number onto the image.
					% At this point it's just going into the overlay,
					% not actually getting written into the pixel values.
					text(5, 5, caption, 'FontSize', 20);
					
					% Extract the image with the text "burned into" it.
					frameWithText = getframe(gca); % Get screenshot of just this axes.
					% frameWithText.cdata is the image with the text
					% actually written into the pixel values.
					text(x, y, caption);  % Put text into overlay, rather than burn it into image.
					thisFrame = frameWithText.cdata;
					if wantsSameSize
						% Screenshot does not have the same size.  Need to force it to have the same size.
						thisFrame = imresize(thisFrame, [vidHeight, vidWidth]);
						% It's the same size but may be blurry.
					end
				else
					% thisFrame = original image (nothing to do)
					% Image will have a different size
				end
				% Write it out to disk.
				imwrite(thisFrame, outputFullFileName, 'png');
			end
		end
		%------------------------------------------------------------------------------------------------------------------------------------------	

See attached example. Adapt as needed.