About the frame

Hellow, everybody

I want to ask that a lot of frames can be became a short video. because I extract some ketframs from the video, then I must consist of video from the keyframes.

this is my current code

clear all;
load glasses      % glasses.avi

[m,n,c,f]=size(xa);   % [480 640 3 203]

h=zeros(1,256);   % 0~255pixal
e=zeros(1,326);    
a=zeros(1,326);
dif=zeros(1,326);
se=zeros(1,326);
b=zeros(1,326);
c=3; 
for ix=3:326

          h=zeros(1,256);    
              for ii=1:m
                  for jj=1:n                
                     h(xa(ii,jj,c,ix)+1)= h(xa(ii,jj,c,ix)+1)+1;   
                   end
              end

             % figure(1)
             % plot(h)

              pf=h/(m*n);
             % figure(2)
             % plot(pf)

              for ii=1:256
                  if(pf(ii)==0)   % pf為0，則q(消息量)為0
                      q(ii)=0;
                else
                      q(ii)=-1.*log2(pf(ii));    %pf不為0，則用log去計算出q(消息量)
                  end
              end

              ef=pf.*q;   

              e(ix)=sum(pf.*q);     

          em=sort(ef,2,'descend');

          s=0;
          for k=1:256
             s=s+em(k);
             %if (s>=0.7*e(ix) ) 
             if (s>=0.07*e(ix) )
                se(ix)=s; 
               break;   

              end
          end

       a(ix)=k;
       s=0;

       for k=a(ix):256
             s=s+em(k);
       end
       b(ix)=s;  
  end
  i=1;
  num=0;
   for ix=3:326

       if(ix<326)
         dif(ix)=abs(b(ix)-b(ix+1));

         if(dif(ix)>0.21)
         ix
         num=num+1;
         figure(i)
         i=i+1;
         imshow(uint8(xa(:,:,:,ix)))
        end
       end

   end

could you give me some advices,thanks!!

Answer 1

[Walter Roberson]

See VideoWriter() or the earlier avifile(); or movie2avi()

[Pan]

Could you descripe carefully for your answer?

thank you!

[Walter Roberson]

Use the VideoWriter class to open an AVI file for writing. Then in the loop, at each point that you have a frame ready to add to the video, use the appropriate VideoWriter class call to add the frame to the video. When you have finished processing all of the frames, close the VideoWriter object.

You can refer to the VideoWriter documentation for an example.

[Pan]

you say good, but now, I don't how to became to code