MATLAB project

Decompose the video

to frames using matlab

              1-      Read the video.

              2-      Get the number of frames in the video.

              3-      Name the frames.

              4-      And save the images .

 

Modified random frames

              1-      Read the directory contain the frames of the original video.

              2-      Get the number of images.

              3-      Create a random number.

              4-      Replace a number of frames by adding to others frames.

Reconstruct the video

              1-      Create matlab movie structure .

              2-      Read the images.

              3-      Show the images.

              4-      Get frames from gca.

              5-      Create the movie.

              6-      Play the movie.

Function that create

a modify video

Detect the modification

              1-      Read the video.

                    2-      Decompose into frames.

                    3-       Difference between to image.

                    4-      Convert into binary.

                    5-      Message box the frames that are modified.

function detect_modif(video_dir)

video = mmreader(video_dir);

video_frames = read(video);

nb_frames = get(video, 'numberOfFrames');

mkdir('test')

    mov(1).cdata = video_frames(:,:,:,1);

    mov(1).colormap = [];

    name1=strcat('test\test',int2str(1),'.jpeg');

    imwrite(mov(1).cdata, name1);

   

    h=0;

    s=0;

for k = 2 : nb_frames

    mov(k).cdata = video_frames(:,:,:,k);

    mov(k).colormap = [];

    name1=strcat('test\test',int2str(k),'.jpeg');

    imwrite(mov(k).cdata, name1);

    im=strcat('test\test',num2str(k),'.jpeg');

    im1=imread(im);

   

    imm=strcat('test\test',num2str(k-1),'.jpeg');

    imm1=imread(imm);

   

    diff_imm = imabsdiff(im1(:,:),imm1(:,:));

    diff_imbww= im2bw(diff_imm);

    bwarea = bwareaopen(diff_imbww,60);

    x(k)=mean(mean(bwarea));

end

h=max(x);

[tf, index] = ismember(max(x), x);

x(index)=0;

hh=max(x);

x(index)=h;

for k = 2 : nb_frames

    if (x(k)>=hh)

    s=s+1;

    S(s)=k;

    %msgbox(sprintf('These Values are incorrect WARNING %f warn',k));

    end

end

msgbox(sprintf('this video is modified the modification is between the frame : %f and %g',S(s-1),S(s)-1),'WARNING','warn');