How to add caption/subtitles to Video in MATLAB

I used the ‘text’ function to add the subtitles.

The procedure to add subtitles to the Video:

· Read an video file

· Read each video frame data

· Add text to each frame using the syntax ‘text(x,y,string)’.

· Use imshow to display the image.

· Get the frame from the figure displayed.

MATLAB CODE:

%Input a Video file

obj=mmreader('Poem.avi');

A=read(obj);

j=1;

%Preallocate the frame structure

Frame=struct('cdata',1,'colormap',cell([1 100]));

INPUT VIDEO

%Get the first frame as image

%Add text

%Use 'getframe' to grab the figure

Caption={'How to add Caption/Subtitles';'to video in MATLAB';'GET CODE AT http://angeljohnsy.blogspot.in/';};

I=A(:,:,:,1);

imshow(I),hold on

text(80,100,Caption{1},'Color','w','FontWeight','Bold','FontSize',30);

text(150,200,Caption{2},'Color','w','FontWeight','Bold','FontSize',30);

text(300,480,Caption{3},'Color','r','FontWeight','Bold','FontSize',15);

Frame(j:j+9)=getframe;

j=j+10;

%Get the Second frame as an image i.eA(:,:,:,2);

%Add the Poem title and the author name

Title_={'THE ROAD NOT TAKEN';'-ROBERT FROST'};

I=A(:,:,:,2);

imshow(I), hold on

text(40,100,Title_{1},'Color','k','FontWeight','Bold','FontSize',40);

text(350,550,Title_{2},'Color','k','FontWeight','Bold','FontSize',30);

Frame(j:j+9)=getframe;

j=j+10;

%Create a cell array with the Poem versus

Txt={'TWO roads diverged in a yellow wood,';

'And sorry I could not travel both';

'And be one traveler, long I stood';

'And looked down one as far as I could';

'To where it bent in the undergrowth;';

'Then took the other, as just as fair,';

'And having perhaps the better claim,';

'Because it was grassy and wanted wear;';

'Though as for that the passing there';

'Had worn them really about the same,';

'And both that morning equally lay';

'In leaves no step had trodden black.';

'Oh, I kept the first for another day!';

'Yet knowing how way leads on to way,';

'I doubted if I should ever come back.';

'I shall be telling this with a sigh';

'Somewhere ages and ages hence:';

'Two roads diverged in a wood, and I—';

'I took the one less traveled by,';

'And that has made all the difference.';};

%display the image

%Add the poem lines

%Grab the frame

%There are 20 lines totally

%Add 3 and 2 lines alternatively in each frame

inc=0;

for i=3:size(A,4)

n=mod(i,2);

I=A(:,:,:,i);

imshow(I), hold on

for k=1:2+n

text(80,440+(k*40),Txt{k+inc},'Color','w','FontWeight','Bold','FontSize',25);

end

inc=inc+2+n;

Frame(j:j+19)=getframe;

j=j+20;

end

Create a Video File:

obj=avifile('Road Not Taken.avi','FPS',3);

obj=addframe(obj,Frame);

obj=close(obj);

VIDEO WITH SUBTITLE

Explanation:

text(40,100,Title_{1},'Color','k','FontWeight','Bold','FontSize',40);

This code will add the text ‘THE ROAD NOT TAKEN’ with color font size 40, font weight bold and color black (k).

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