I'm using MATLAB 2017b, my face recognition code doesn't work, anyone can help to solve?

 
% FACE DETECTION:
clear ALL
clc
%Detect objects using Viola-Jones Algorithm
 
%To detect Face
FDetect = vision.CascadeObjectDetector;
 
%Read the input image
 I = imread('/Users/paulling95/Desktop/Left Frames/frame25.jpg');
%Returns Bounding Box values based on number of objects
BB = step(FDetect,I);
 
figure,
imshow(I);
hold on
k=1;
for i = 1:size(BB,1) % draw rectanlge in row wise
    rectangle('Position',BB(i,:),'LineWidth',2,'LineStyle','-','EdgeColor','g');
    %start from first row then second and ....
   
end
% title('Face Detection');
hold off;
for i= 1:size(BB,1)
    J= imcrop(I,BB(i,:));
    p2=strcat('cropped faces/', int2str(k),'.jpg');
    I2 = rgb2gray(J); 
    I2= imresize(I2, [200 150]);
    k=k+1;
    imwrite(I2,p2)
end
% Face Recognition
TrainDatabasePath= '/Users/paulling95/Desktop/Demo/face database';
  TestDatabasePath= '/Users/paulling95/Desktop/Demo/Cropped faces';
 
  srfile=dir('cropped faces/*.jpg');
for i=1:length(srfile)
    prompt=strcat('cropped faces/',srfile(i).name);
im = imread(prompt);
 
T = CreateDatabase(TrainDatabasePath);
[m, A, Eigenfaces] = EigenfaceCore(T);
% S={'20.jpg'};
OutputName= Recognition(prompt, m, A, Eigenfaces);
 
SelectedImage = strcat(TrainDatabasePath,'\',OutputName);
SelectedImage = imread(SelectedImage);
figure,
subplot(2,2,1)
imshow(im)
title('Test Image');
% figure,
subplot(2,2,2);
imshow(SelectedImage)
title('Equivalent Image');
 
str = strcat('Matched image is :  ',OutputName);
disp(str)
end

[KSSV]

In URGENT need......we are not here for your urgency/ emergency.

my face recognition code doesn't work, why it doesn't work any error? Wrong result? What made you tell so...give complete problem. What is your input?

[Paul Ling]

Error using imread>get_full_filename (line 516)
File "/Users/paulling95/Desktop/Demo/face database/Users/paulling95/Desktop/Demo/face database\1.jpg" does
not exist.

Error in imread (line 340)
    fullname = get_full_filename(filename);

Error in CreateDatabase (line 40)
    img = imread( fullfile('/Users/paulling95/Desktop/Demo/face database', str));

Error in main (line 43)
T = CreateDatabase(TrainDatabasePath);

These are the error.

[Sindhuja Chaduvula]

TrainDatabasePath = '/\Users\prasanth\Downloads\MATLAB code 3\database2\';
TestDatabasePath = '/\Users\prasanth\Downloads\MATLAB code 3\TestDatabase\';
 
%%%%%%%%%%%%%%%%%%%%%%%%%%% No. of test images
TrainFiles = dir('/\Users\prasanth\Downloads\MATLAB code 3\Testdatabase\');
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
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 v=Train_Number-1;
for j = 1:v
   
    TestImage  = num2str(j);
 %   display(TestImage);
     s=strcat('a',TestImage);
 %   display(s);
    TestImage = strcat(TestDatabasePath,char(TestImage),'.jpg');
    im=imread(TestImage);
 %   display(TestImage);
    T = CreateDatabase(TrainDatabasePath); % T is the 1D matrix of the traindatabase
    [m, A, Eigenfaces] = EigenfaceCore(T);
    [OutputName,Recognized_index] = Recognition(TestImage, m, A, Eigenfaces);
    SelectedImage = strcat(TrainDatabasePath,'\',  OutputName);
    SelectedImage = imread(SelectedImage);
%    axes(eval(['handles.axes', num2str(s)]));
    imshow(SelectedImage);
    str = strcat('Matched image is :  ',OutputName);
disp(str)
end

[Sindhuja Chaduvula]

Im not getting an output for this code in my mac cant u tell me wats wrong in it

[Walter Roberson]

\ is not a directory separator except on Windows.

TrainDatabasePath = '/Users/prasanth/Downloads/MATLAB code 3/database2';
TestDatabasePath = '/Users/prasanth/Downloads/MATLAB code 3/TestDatabase';
 
%%%%%%%%%%%%%%%%%%%%%%%%%%% No. of test images
TestFiles = dir(TestDatabasePath);
Test_Number = 0;
 
TestFiles( [TestFiles.isfolder] | ismember({TestFiles.name}, {'Thumbs.db'}) ) = [];
TestFileNames = fullfile({TestFiles.folder}, {TestFiles.name});

Test_number = length(TestFileNames);

T = CreateDatabase(TrainDatabasePath); % T is the 1D matrix of the traindatabase
[m, A, Eigenfaces] = EigenfaceCore(T);

%%%%%%%%%%%%%%%%%%%%%%%%%%
for j = 1:Test_number
    TestImage = TestFileNames{j};
    [~, basename, ~] = fileparts(TestImage);
    im = imread(TestImage);
    [OutputName, Recognized_index] = Recognition(TestImage, m, A, Eigenfaces);
    SelectedImageName = fullfile(TrainDatabasePath, OutputName);
    SelectedImage = imread(SelectedImageName);
    imshow(SelectedImage);
    fprintf('Matched image for "%s" is: "%s"\n', basename, OutputName);
end

[Sindhuja Chaduvula]

I am running the code on mac ..

so what path should i use

im not even getting any errors

[Sindhuja Chaduvula]

>> main

>>

this is my output in command window

[Sindhuja Chaduvula]

Unrecognized field name "isfolder".

Error in main2 (line 8)

TestFiles( [TestFiles.isfolder] | ismember({TestFiles.name}, {'Thumbs.db'}) ) = [];

>>

this is the output after running your code

[Sindhuja Chaduvula]

can u please help me in solving this error

[Walter Roberson]

Sorry should be isdir instead of isfolder

[Sindhuja Chaduvula]

function [OutputName,Recognized_index] = Recognition( TestImage, m, A, Eigenfaces)
 
% Recognizing step....
%
% Description: This function compares two faces by projecting the images into facespace and 
% measuring the Euclidean distance between 'them.
%
% Argument:      TestImage              - Path of the input test image
%
%                m                      - (M*Nx1) Mean of the training
%                                         database, which is output of 'EigenfaceCore' function.
%
%                Eigenfaces             - (M*Nx(P-1)) Eigen vectors of the
%                                         covariance matrix of the training
%                                         database, which is output of 'EigenfaceCore' function.
%
%                A                      - (M*NxP) Matrix of centered image
%                                         vectors, which is output of 'EigenfaceCore' function.
% 
% Returns:       OutputName             - Name of the recognized image in the training database.
%
% See also: RESHAPE, STRCAT
 
                
 
%%%%%%%%%%%%%%%%%%%%%%%% Projecting centered image vectors into facespace
% All centered images are projected into facespace by multiplying in
% Eigenface basis's. Projected vector of each face will be its corresponding
% feature vector.
 
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
 
%%%%%%%%%%%%%%%%%%%%%%%% Extracting the PCA features from test image
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
 
%%%%%%%%%%%%%%%%%%%%%%%% Calculating Euclidean distances 
% Euclidean distances between the projected test image and the projection
% of all centered training images are calculated. Test image is
% supposed to have minimum distance with its corresponding image in the
% training database.
 
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);
 
Euc_dist_min;
OutputName = strcat(int2str(Recognized_index),'.jpg');
end

[Sindhuja Chaduvula]

>> main2

Error using -

Arrays have incompatible sizes for this operation.

Error in Recognition (line 44)

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

Error in main2 (line 18)

[OutputName, Recognized_index] = Recognition(TestImage, m, A, Eigenfaces);

[Sindhuja Chaduvula]

after changing it as isdir im getting the above error

and the above code is for recoginition

can u please help me in solving the error

[Walter Roberson]

Could you remind us which MATLAB version you are using? I suspect R2015a or earlier.

[Walter Roberson]

You could get that error if the test images are not the same size as the training images.

[Sindhuja Chaduvula]

im using MATLAB R2021a

[Sindhuja Chaduvula]

>> main2

Error using imread>get_format_info (line 545)

Unable to determine the file format.

Error in imread (line 391)

fmt_s = get_format_info(fullname);

Error in main2 (line 17)

im = imread(TestImage);

[Sindhuja Chaduvula]

after giving same no. of images im gettinthe above error

[Walter Roberson]

Your directory contains something that is not . or .. or Thumbs.db or a known image type.

[Sindhuja Chaduvula]

My test and train database each contains 108 images so there isnt is one not know as image type yet im getting the same error

[Walter Roberson]

TrainDatabasePath = '/Users/prasanth/Downloads/MATLAB code 3/database2';
TestDatabasePath = '/Users/prasanth/Downloads/MATLAB code 3/TestDatabase';
 
%%%%%%%%%%%%%%%%%%%%%%%%%%% No. of test images
TestFiles = dir(TestDatabasePath);
Test_Number = 0;
 
TestFiles( [TestFiles.isfolder] | ismember({TestFiles.name}, {'Thumbs.db'}) ) = [];
TestFileNames = fullfile({TestFiles.folder}, {TestFiles.name});

Test_number = length(TestFileNames);

T = CreateDatabase(TrainDatabasePath); % T is the 1D matrix of the traindatabase
[m, A, Eigenfaces] = EigenfaceCore(T);

%%%%%%%%%%%%%%%%%%%%%%%%%%
for j = 1:Test_number
    TestImage = TestFileNames{j};
    [~, basename, ~] = fileparts(TestImage);
    try
      im = imread(TestImage);
    catch
        fprintf('Warning: "%s" does not appear to be a readable image file\n', TestImage);
        continue
    end
    [OutputName, Recognized_index] = Recognition(TestImage, m, A, Eigenfaces);
    SelectedImageName = fullfile(TrainDatabasePath, OutputName);
    SelectedImage = imread(SelectedImageName);
    imshow(SelectedImage);
    fprintf('Matched image for "%s" is: "%s"\n', basename, OutputName);
end

Answer 1

[Walter Roberson]

You are on Mac or Linux, and you are trying to use code that assumes Windows.

In the place that SelectedImage has a \ added into it, that should be a / for Linux or Mac. / also works for Windows.

Each place that a / or \ directory separator is added into the path should ideally be replaced with a call to fullfile()

[Paul Ling]

Yeah, I'm Mac user.

Can i ask how to solve it using fullfile()? I'm still having error below.

function T = CreateDatabase(TrainDatabasePath)
% Align a set of face images (the training set T1, T2, ... , TM )
%
% Description: This function reshapes all 2D images of the training database
% into 1D column vectors. Then, it puts these 1D column vectors in a row to 
% construct 2D matrix 'T'.
%  
% 
% Argument:     TrainDatabasePath      - Path of the training database
%
% Returns:      T                      - A 2D matrix, containing all 1D image vectors.
%                                        Suppose all P images in the training database 
%                                        have the same size of MxN. So the length of 1D 
%                                        column vectors is MN and 'T' will be a MNxP 2D matrix.
%
% See also: STRCMP, STRCAT, RESHAPE
 
% Original version by Amir Hossein Omidvarnia, October 2007
%                     Email: [e-mail]                  
 
%%%%%%%%%%%%%%%%%%%%%%%% File management
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
 
%%%%%%%%%%%%%%%%%%%%%%%% Construction of 2D matrix from 1D image vectors
T = [];
for i = 1 : Train_Number
    
    % I have chosen the name of each image in databases as a corresponding
    % number. However, it is not mandatory!
    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

I get this error.

>> TrainDatabasePath= '/Users/paulling95/Desktop/Demo/faces database';

TestDatabasePath= '/Users/paulling95/Desktop/Demo/Cropped faces';

>> T = CreateDatabase(TrainDatabasePath)

Error using imread>get_full_filename (line 516)

File "/Users/paulling95/Desktop/Demo/faces database/29.jpg" does not exist.

Error in imread (line 340)

fullname = get_full_filename(filename);

Error in CreateDatabase (line 40)

img = imread(str);

[Walter Roberson]

Replace the stuff after '% I have chosen' down to

str = fullfile( TrainDatabasePath, sprintf('%d.jpg', i) );
if ~exist(str, 'file')
    error('could not find input file "%s"', str);
end
img = imread(str);
if ndims(img) > 2; img = rgb2gray(img); end
T = [T, img(:)];

However this is likely to generate the same file name. What do you see if you do

ls( fullfile(TrainDatabasePath, '*29*') )