error is image recognised with different person

i am using Amir Hossein Omidvarnia code of image processing

clc
clear all
close all

vid = videoinput('winvideo',1,'YUY2_320x240');
while(1==1)
    choice=menu('Face Recognition',...
                'Start Cam',...
                'Capture The Image',...
                'Recognize The Image',...
                'Exit');

      if (choice ==1)
          start(vid);
          preview(vid);
      end

      if (choice ==2)

set(vid, 'ReturnedColorSpace', 'RGB');
data = getsnapshot(vid);
%diff_im = imsubtract(data(:,:,1), rgb2gray(data));
%diff_im = medfilt2(diff_im, [3 3]);
%diff_im = imadjust(diff_im);
%level = graythresh(diff_im);
%bw = rgb2gray(data);
%c= adapthisteq(bw)
%BW5 = imfill(bw,'holes');

imshow(data)

   imwrite(data, 'C:\Users\SUJEET GAURAV\Desktop\attachments_2\TestDatabase\tinku.jpg');
  %saveas(diff_im,'testdatabase','jpg')
  stop(vid)
  closepreview
  end

      if (choice==3)
          TrainDatabasePath = uigetdir( 'C:\Users\SUJEET GAURAV\Desktop\attachments_2', 'Select training database path' );
  TestDatabasePath = uigetdir( 'C:\Users\SUJEET GAURAV\Desktop\attachments_2', 'Select test database path');

prompt = {'Enter test image name :'};
dlg_title = 'Input of PCA-Based Face Recognition System';
num_lines= 1;
def = {'tinku'};

TestImage  = inputdlg(prompt,dlg_title,num_lines,def);
TestImage = strcat(TestDatabasePath,'\',char(TestImage),'.jpg');
im = imread(TestImage);

T = CreateDatabase(TrainDatabasePath);
[m, A, Eigenfaces] = EigenfaceCore(T);
OutputName = Recognition(TestImage, m, A, Eigenfaces);

SelectedImage = strcat(TrainDatabasePath,'\',OutputName);
SelectedImage = imread(SelectedImage);

imshow(im)
title('Test Image');
figure,imshow(SelectedImage);
title('Equivalent Image');

str = strcat('Matched image is :  ',OutputName);
disp(str)

      end

      if (choice==4)
          clear choice
          return;
      end
  end

output is not matched with input image why