need help in vehicle detection in images

i am working with a code for vehicle detection... i get an error (

Index exceeds matrix dimensions.

Error in vehicle_detect (line 14) for i=1:85 im{i}=imread(strcat('snaps\',t2{i})) ;

)

which i am unable to resolve! can any one help? code is written below:

 clc
clear all
close all
t=('snaps');
t1=struct2cell(t);
t2=t1(1,3:end);
p2 = [150,640];
p3= [150,1];
q3 = [200,640];
q2 = [200,1];
thcar=7;
%figure('name','Vehicle Image','numbertitle','off')
%%image read & rgb to gray conversion
for i=1:85  im{i}=imread(strcat('snaps\',t2{i})) ;
    if size(im{i},3)>1
        im{i}=rgb2gray(im{i});
    end
    imshow(im{i});
    hold on
    plot([p2(2),p3(2)],[p2(1),p3(1)],'Color','r','LineWidth',2)
    plot([q2(2),q3(2)],[q2(1),q3(1)],'Color','b','LineWidth',2)
    pause(0.1)
end
%%line drawing on images
%figure('name','Vehicle crop Image','numbertitle','off')
for i=1:length(im)
    im1{i}=imcrop(im{i},[p3(2) p2(1) q3(2) q3(1)-p2(1)]) ;
     imshow(im1{i})
    %pause(0.1)
end
%%diffrentiated images
figure('name','diffretiated Image','numbertitle','off')
ZC=0;
for i=1:length(im1)-1

    %     d{i}=im1{i}-im1{i+1};
    diff_im = imabsdiff(im1{i},im1{i+1});
    temp= im2bw(diff_im,0.15);
    [x,y]=find(temp);
    I=zeros(size(temp));
    Ix=im1{i+1};
    for i=1:length(x)
        I(x(i),y(i))=Ix(x(i),y(i));
    end
%     d{i}=I;
     imshow(I)
    %imtool(d{i});
%     pause(0.2)
    hold on
    blobAnalysis = vision.BlobAnalysis('BoundingBoxOutputPort', true, ...
        'AreaOutputPort', false, 'CentroidOutputPort', false, ...
        'MinimumBlobArea', 500);

    bbox = step(blobAnalysis, temp);
    result = insertShape(Ix ,'Rectangle', bbox, 'Color', 'green');
      ZC=ZC+(size(bbox,5)/thcar);
      Zb=ZC;
        resultt= insertText(result,[10 10],round(Zb(:)),'BoxOpacity', 1, ...
           'FontSize', 15);
        YO=imshow(resultt);
        dd=size(resultt);
        title('Detected Cars');
         k=msgbox('cars');
         close(k);

end

    if ZC>=3.0

        for i=0:length(ZC)
             r=k/1200.33;
             totalTRUCKS =round(r);
         end
        title('Detected TRUCKS');
      msgbox(sprintf('totalTRUCKS = %2.3g\n',totalTRUCKS));
    end
    for i=0:length(Zb)
             r=k/k*ZC-totalTRUCKS;
             totalCARS =round(r);
    end

 msgbox(sprintf('totalCARS = %2.3g\n',totalCARS));

Answer 1

[Image Analyst]

What is "i"? Evidently t2 does not have that many elements. Why do you think it should?