Voice Biometrics Authentication and Face Recognition
Voice Biometrics Authentication using GMM and Face Recognition Using Facenet and Tensorflow
How to Run :
Install dependencies by running pip3 install -r requirement.txt
1.Run in Jupyter notebook - main.ipynb
2.Run in terminal in following way :
To add new user :
python3 add_user.py
To Recognize user :
python3 recognize.py
To Recognize until KeyboardInterrupt (ctrl + c) by the user:
python3 recognize_until_keyboard_Interrupt.py
To delete an existing user :
python3 delete_user.py
Voice Authentication
For Voice recognition, GMM (Gaussian Mixture Model) is used to train on extracted MFCC features from audio wav file.
Face Recognition
Face Recognition system using Siamese Neural network. The model is based on the FaceNet model implemented using Tensorflow and OpenCV implementaion has been done for realtime face detection and recognition.
The model uses face encodings for identifying users.
The program uses a python dictionary for mapping for users to their corresponding face encodings.
How it works? Step-by-Step guide
Import the dependencies
import tensorflow as tf
import numpy as np
import os
import glob
import pickle
import cv2
import time
from numpy import genfromtxt
from keras import backend as K
from keras.models import load_model
K.set_image_data_format('channels_first')
np.set_printoptions(threshold=np.nan)
import pyaudio
from IPython.display import Audio, display, clear_output
import wave
from scipy.io.wavfile import read
from sklearn.mixture import GMM
import warnings
warnings.filterwarnings("ignore")
from sklearn import preprocessing
# for converting audio to mfcc
import python_speech_features as mfcc
Facial Encodings
#provides 128 dim embeddings for face
def img_to_encoding(img):
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
#converting img format to channel first
img = np.around(np.transpose(img, (2,0,1))/255.0, decimals=12)
x_train = np.array([img])
#facial embedding from trained model
embedding = model.predict_on_batch(x_train)
return embedding
The Function reads input image and convert image format to channel first as required by pre-trained facenet model.
The model provides output as 128 dimensional encoding vector for the input image.
Triplet Loss
def triplet_loss(y_true, y_pred, alpha = 0.2):
anchor, positive, negative = y_pred[0], y_pred[1], y_pred[2]
# triplet loss formula
pos_dist = tf.reduce_sum( tf.square(tf.subtract(y_pred[0], y_pred[1])) )
neg_dist = tf.reduce_sum( tf.square(tf.subtract(y_pred[0], y_pred[2])) )
basic_loss = pos_dist - neg_dist + alpha
loss = tf.maximum(basic_loss, 0.0)
return loss
# load the model
model = load_model('facenet_model/model.h5', custom_objects={'triplet_loss': triplet_loss})
Two encodings are compared and if they are similar then two images are of the same person otherwise they are different.
They are compared by using triplet loss formula. After that load the facenet model which is trained on inception network.
MFCC features and Extract delta of the feature vector
def calculate_delta(array):
rows,cols = array.shape
deltas = np.zeros((rows,20))
N = 2
for i in range(rows):
index = []
j = 1
while j <= N:
if i-j < 0:
first = 0
else:
first = i-j
if i+j > rows -1:
second = rows -1
else:
second = i+j
index.append((second,first))
j+=1
deltas[i] = ( array[index[0][0]]-array[index[0][1]] + (2 * (array[index[1][0]]-array[index[1][1]])) ) / 10
return deltas
#convert audio to mfcc features
def extract_features(audio,rate):
mfcc_feat = mfcc.mfcc(audio,rate, 0.025, 0.01,20,appendEnergy = True, nfft=1103)
mfcc_feat = preprocessing.scale(mfcc_feat)
delta = calculate_delta(mfcc_feat)
#combining both mfcc features and delta
combined = np.hstack((mfcc_feat,delta))
return combined
Converting audio into MFCC features and scaling it to reduce complexity of the model. Than Extract the delta of the given feature vector matrix and combine both mfcc and extracted delta to provide it to the gmm model as input.
Adding a New User's Face
def add_user():
name = input("Enter Name:")
# check for existing database
if os.path.exists('./face_database/embeddings.pickle'):
with open('./face_database/embeddings.pickle', 'rb') as database:
db = pickle.load(database)
if name in db:
print("Name Already Exists! Try Another Name...")
return
else:
#if database not exists than creating new database
db = {}
cap = cv2.VideoCapture(0)
cap.set(3, 640)
cap.set(4, 480)
#detecting only frontal face using haarcascade
face_cascade = cv2.CascadeClassifier('./haarcascades/haarcascade_frontalface_default.xml')
i = 3
face_found = False
while True:
_, frame = cap.read()
frame = cv2.flip(frame, 1, 0)
#time.sleep(1.0)
cv2.putText(frame, 'Keep Your Face infront of Camera', (100, 200), cv2.FONT_HERSHEY_SIMPLEX,
0.8, (255, 255, 255), 2)
cv2.putText(frame, 'Starting', (260, 270), cv2.FONT_HERSHEY_SIMPLEX,
0.8, (255, 255, 255), 2)
cv2.putText(frame, str(i), (290, 330), cv2.FONT_HERSHEY_SIMPLEX,
1.3, (255, 255, 255), 3)
i-=1
cv2.imshow('frame', frame)
cv2.waitKey(1000)
if i < 0:
break
start_time = time.time()
img_path = './saved_image/1.jpg'
## Face recognition
while True:
curr_time = time.time()
_, frame = cap.read()
frame = cv2.flip(frame, 1, 0)
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
face = face_cascade.detectMultiScale(gray, 1.3, 5)
if len(face) == 1:
for(x, y, w, h) in face:
roi = frame[y-10:y+h+10, x-10:x+w+10]
fh, fw = roi.shape[:2]
#make sure the face roi is of required height and width
if fh < 20 and fw < 20:
continue
face_found = True
#cv2.imwrite(img_path, roi)
cv2.rectangle(frame, (x-10,y-10), (x+w+10, y+h+10), (255, 200, 200), 2)
if curr_time - start_time >= 3:
break
cv2.imshow('frame', frame)
cv2.waitKey(1)
cap.release()
cv2.destroyAllWindows()
if face_found:
img = cv2.resize(roi, (96, 96))
db[name] = img_to_encoding(img)
with open('./face_database/embeddings.pickle', "wb") as database:
pickle.dump(db, database, protocol=pickle.HIGHEST_PROTOCOL)
elif len(face) > 1:
print("More than one faces found. Try again...")
return
else:
print('There was no face found in the frame. Try again...')
return
This part of the function add_user() is used to add a new user's face into the database.
First it detects the face in the frame using haarcascade classifier, if exact one face is found than it resizes the roi and passes it to the function img_to_encoding(img) which will return 128 dim facial encodings and dumps that encodings into our face_database as pickle file.
The reason behind using haarcascade face detector is that it only detects frontal face and not the side faces, so it will only unlock when the user looks in front of the camera.
If more than one faces or no faces are found in the frame than it will generate an error message.
Adding a New User's voice
#Voice authentication
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
CHUNK = 1024
RECORD_SECONDS = 3
source = "./voice_database/" + name
os.mkdir(source)
for i in range(3):
audio = pyaudio.PyAudio()
if i == 0:
j = 3
while j>=0:
time.sleep(1.0)
print("Speak your name in {} seconds".format(j))
clear_output(wait=True)
j-=1
elif i ==1:
print("Speak your name one more time")
time.sleep(0.5)
else:
print("Speak your name one last time")
time.sleep(0.5)
# start Recording
stream = audio.open(format=FORMAT, channels=CHANNELS,
rate=RATE, input=True,
frames_per_buffer=CHUNK)
print("recording...")
frames = []
for _ in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
data = stream.read(CHUNK)
frames.append(data)
# stop Recording
stream.stop_stream()
stream.close()
audio.terminate()
# saving wav file of speaker
waveFile = wave.open(source + '/' + str((i+1)) + '.wav', 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()
print("Done")
dest = "./gmm_models/"
count = 1
for path in os.listdir(source):
path = os.path.join(source, path)
features = np.array([])
# reading audio files of speaker
(sr, audio) = read(path)
# extract 40 dimensional MFCC & delta MFCC features
vector = extract_features(audio,sr)
if features.size == 0:
features = vector
else:
features = np.vstack((features, vector))
# when features of 3 files of speaker are concatenated, then do model training
if count == 3:
gmm = GMM(n_components = 16, n_iter = 200, covariance_type='diag',n_init = 3)
gmm.fit(features)
# saving the trained gaussian model
pickle.dump(gmm, open(dest + name + '.gmm', 'wb'))
print(name + ' added successfully')
features = np.asarray(())
count = 0
count = count + 1
if __name__ == '__main__':
add_user()
The second part of the function add_user() is used to add a new user's voice into the database.
The User have to speak his/her name one time at a time as the system asks the user to speak the name for three times. It saves three voice samples of the user as a wav file.
The function extract_features(audio, sr) extracts 40 dimensional MFCC and delta MFCC features as a vector and concatenates all the three voice samples as features and passes it to the GMM model and saves user's voice model as .gmm file.
Voice Authentication
def recognize():
# Voice Authentication
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
CHUNK = 1024
RECORD_SECONDS = 3
FILENAME = "./test.wav"
audio = pyaudio.PyAudio()
# start Recording
stream = audio.open(format=FORMAT, channels=CHANNELS,
rate=RATE, input=True,
frames_per_buffer=CHUNK)
print("recording...")
frames = []
for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
data = stream.read(CHUNK)
frames.append(data)
print("finished recording")
# stop Recording
stream.stop_stream()
stream.close()
audio.terminate()
# saving wav file
waveFile = wave.open(FILENAME, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()
modelpath = "./gmm_models/"
gmm_files = [os.path.join(modelpath,fname) for fname in
os.listdir(modelpath) if fname.endswith('.gmm')]
models = [pickle.load(open(fname,'rb')) for fname in gmm_files]
speakers = [fname.split("/")[-1].split(".gmm")[0] for fname
in gmm_files]
#read test file
sr,audio = read(FILENAME)
# extract mfcc features
vector = extract_features(audio,sr)
log_likelihood = np.zeros(len(models))
#checking with each model one by one
for i in range(len(models)):
gmm = models[i]
scores = np.array(gmm.score(vector))
log_likelihood[i] = scores.sum()
pred = np.argmax(log_likelihood)
identity = speakers[pred]
# if voice not recognized than terminate the process
if identity == 'unknown':
print("Not Recognized! Try again...")
return
print( "Recognized as - ", identity)
This part of the function recognizes voice of the user as the user have to speak his/her name as the system asks.
As the user speaks his/her name the function saves the voice sample as a test.wav file and than Reads it to extract 40 dim MFCC features.
Load all the pre-trained gmm models and passes the new extracted MFCC vector into the gmm.score(vector) function checking with each model one-by-one and sums the scores to calculate log_likelihood of each model. Takes the argmax value from the log_likelihood which provides the prediction of the user with highest prob distribution.
If the user's voice matches than it will go onto the face recogniton part otherwise the function will terminate by showing an appropriate message.
Face Recognition
# face recognition
print("Keep Your face infront of the camera")
cap = cv2.VideoCapture(0)
cap.set(3, 640)
cap.set(4, 480)
cascade = cv2.CascadeClassifier('./haarcascades/haarcascade_frontalface_default.xml')
#loading the database
database = pickle.load(open('face_database/embeddings.pickle', "rb"))
time.sleep(1.0)
start_time = time.time()
while True:
curr_time = time.time()
_, frame = cap.read()
frame = cv2.flip(frame, 1, 0)
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
face = cascade.detectMultiScale(gray, 1.3, 5)
name = 'unknown'
if len(face) == 1:
for (x, y, w, h) in face:
roi = frame[y-10:y+h+10, x-10:x+w+10]
fh, fw = roi.shape[:2]
min_dist = 100
#make sure the face is of required height and width
if fh < 20 and fh < 20:
continue
#resizing image as required by the model
img = cv2.resize(roi, (96, 96))
#128 d encodings from pre-trained model
encoding = img_to_encoding(img)
# loop over all the recorded encodings in database
for knownName in database:
# find the similarity between the input encodings and recorded encodings in database using L2 norm
dist = np.linalg.norm(np.subtract(database[knownName], encoding) )
# check if minimum distance or not
if dist < min_dist:
min_dist = dist
name = knownName
# if min dist is less then threshold value and face and voice matched than unlock the door
if min_dist < 0.4 and name == identity:
print ("Door Unlocked! Welcome " + str(name))
break
#open the cam for 3 seconds
if curr_time - start_time >= 3:
break
cv2.waitKey(1)
cv2.imshow('frame', frame)
cap.release()
cv2.destroyAllWindows()
if len(face) == 0:
print('There was no face found in the frame. Try again...')
elif len(face) > 1:
print("More than one faces found. Try again...")
elif min_dist > 0.5 or name != identity:
print("Not Recognized! Try again...")
if __name__ == '__main__':
recognize()
If the User's voice matches than the function will execute the face recognition part.
First it will load the cascade classifier to detect the face from the frame and than loads embeddings.pickle file which holds facial embeddings of authorized users.
If only one face was found than it will capture the face roi, resizes it and computes the 128 dimensional facial encodings. Than loop over all the recorded encodings in the database and finds the similarity between the input encodings and recorded encodings in database using L2 norm, if min dist is less then threshold value and both face and voice matches than it identifies the user as authorized and unlocks the door.
If min_dist is greater than the threshold value than it will show the user as unauthorized, if no faces or more than one faces are found than it will generate an error message.
Controlling the face recognition accuracy:
The threshold value controls the confidence with which the face is recognized, you can control it by changing the value which is here 0.5.
Another version of recognizing user will keep runnning until KeyboardInterrupt by the user. It is a modified version of recognize() function for real time situations.
References :
Code for Facenet model is based on the assignment from Convolutional Neural Networks Specialization by Deeplearning.ai on Coursera.
https://www.coursera.org/learn/convolutional-neural-networks/home/welcome
Florian Schroff, Dmitry Kalenichenko, James Philbin (2015). FaceNet: A Unified Embedding for Face Recognition and Clustering
The pretrained model used is inspired by Victor Sy Wang's implementation and was loaded using his code: https://github.com/iwantooxxoox/Keras-OpenFace.
Inspiration from the official FaceNet github repository: https://github.com/davidsandberg/facenet
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