smoke detection, fix problem

hi, this code must detect smoke in the video and alarm will active, but the warning active for all videos, even the videos do not smoke. how do i fix it?

vid=uigetfile;
vid=mmreader(vid);
numFrames = vid.NumberOfFrames;
n=numFrames;
for i =1:n
frames = read(vid,i);
imwrite(frames,[int2str(i) '.jpg']);
end 
frm1=rgb2gray(imread('1.jpg'));
for j=1:n       
    frm2=([num2str(j),'.jpg']);
    p1=(imread(frm2,'jpg'));
    p2=(rgb2gray(p1));
    res=abs(double(p2)-double(frm1));
    astn=get(handles.edt,'string');
    astn=str2num(astn);
    ast=res>astn;
    bw=bwareaopen(ast,500);
    R=p1(:,:,1);
    G=p1(:,:,2);
    B=p1(:,:,3);
    xr=R(bw);
    r=mean(xr);
    xg=G(bw);
    g=mean(xg);
    xb=B(bw);
    b=mean(xb);
    avg=(r+g+b)/3;
    S=(abs(r-avg)+abs(b-avg)+abs(g-avg))/3;
    if (S<astn)
        set(handles.text1,'visible','on');
         beep 
         subplot(211)
         h1 = image; 
         axis ij 
         imshow(p1,h1);
        pause(0.5);
        set(handles.text1,'visible','off');
        pause(0.5);

      end;
  end

[aisha khan]

hello sir, did you correct the code?

Answer 1

[Tawakal]

Dear Ehsan I think it will be good if you post the videos that has been used in the code as well along with the complete code (means GUI).Only after that anyone will be able to help you.