I want to create error, how to do..?

*Currently i am recognzing a face, means i have to find a face which we have to test is in training database or not..! So, i have to decide yes or no..

Yes means find image, and no means print message that NO IMAGE IN DATABASE. I have a program, Currently this program is finding a correct image correctly, but even when there is no image, even it shows other image which not matches.. Actually it should print NO IMAGE IN DATABASE.

So, How to do..?

Here is a Test and training images data on this link.

http://www.fileconvoy.com/dfl.php?id=g6e59fe8105a6e6389994740914b7b2fc99eb3e445

My Program is in terms of different four .m files, and it is here,we have to run only first code.. and remaining 3 are functions, it is also given here..

clear all

clc

close all

TrainDatabasePath = uigetdir('D:\Program Files\MATLAB\R2006a\work', 'Select training database path' );

TestDatabasePath = uigetdir('D:\Program Files\MATLAB\R2006a\work', 'Select test database path');

prompt = {'Enter test image name (a number between 1 to 10):'};

dlg_title = 'Input of PCA-Based Face Recognition System';

num_lines= 1;

def = {'1'};

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)

function T = CreateDatabase(TrainDatabasePath)

TrainFiles = dir(TrainDatabasePath);

Train_Number = 0;

for i = 1:size(TrainFiles,1)

if

not(strcmp(TrainFiles(i).name,'.')|strcmp(TrainFiles(i).name,'..')|strcmp(TrainFiles(i).name,'Thumbs.db'))

Train_Number = Train_Number + 1; % Number of all images in the training database

end

end

T = [];

for i = 1 : Train_Number

    str = int2str(i);

    str = strcat('\',str,'.jpg');

    str = strcat(TrainDatabasePath,str);

    img = imread(str);

    img = rgb2gray(img);

    [irow icol] = size(img);

    temp = reshape(img',irow*icol,1);   % Reshaping 2D images into 1D image vectors

    T = [T temp]; % 'T' grows after each turn

end

function [m, A, Eigenfaces] = EigenfaceCore(T)

m = mean(T,2); % Computing the average face image m = (1/P)*sum(Tj's) (j = 1 : P)

Train_Number = size(T,2);

A = [];

for i = 1 : Train_Number

    temp = double(T(:,i)) - m; 

    A = [A temp]; % Merging all centered images

end

L = A'*A; % L is the surrogate of covariance matrix C=A*A'.

[V D] = eig(L); % Diagonal elements of D are the eigenvalues for both L=A'*A and C=A*A'.

L_eig_vec = [];

for i = 1 : size(V,2)

    if( D(i,i)>1 )

        L_eig_vec = [L_eig_vec V(:,i)];

    end

end

Eigenfaces = A * L_eig_vec; % A: centered image vectors

function OutputName = Recognition(TestImage, m, A, Eigenfaces)

ProjectedImages = [];

Train_Number = size(Eigenfaces,2);

for i = 1 : Train_Number

    temp = Eigenfaces'*A(:,i); % Projection of centered images into facespace

    ProjectedImages = [ProjectedImages temp];

end

InputImage = imread(TestImage);

temp = InputImage(:,:,1);

[irow icol] = size(temp);

InImage = reshape(temp',irow*icol,1);

Difference = double(InImage)-m; % Centered test image

ProjectedTestImage = Eigenfaces'*Difference; % Test image feature vector

Euc_dist = [];

for i = 1 : Train_Number

    q = ProjectedImages(:,i);

    temp = ( norm( ProjectedTestImage - q ) )^2;

    Euc_dist = [Euc_dist temp];

end

[Euc_dist_min , Recognized_index] = min(Euc_dist);

OutputName = strcat(int2str(Recognized_index),'.jpg');

So, how to generate error massege when no image matches..?

[Image Analyst]

Well you succeeded in making an error -- in formatting. Here's how to avoid it, so that we can read your posts: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Lalit Patil]

I can't understand what you say..?

[Kevin Claytor]

He's saying that you should;

function code()
  %format your code so it looks like code with the code button.

On topic, have you had a look at exception throwing?

[aimi asyiqin]

i got same problem with you. did you get any solution already? can you email me at [redacted]

Thankyou :)

[Rik]

This is a public forum. You shouldn't ask for non-public replies, as only you will benefit from the help, instead of other people also being able to benefit from it.