A biometric system with a database of registered users and two main functions:
- USER VERIFICATION: given an image of an iris and user's ID, the system verifies whether this image matches known user patterns,
- USER IDENTIFICATION: given an image, the system predicts a possible user from the database.
The system was build on a deep neural network using transfer learning. Given a normalized picture of an iris, the model classifies it to one of the system's users, and gives a probability of the prediction. In order to reject uncertain classifications, only results with probability greater than 98% are considered to be successful.
The architecture chosen was ResNet50, which was pre-trained on ImageNet. The model was the fine-tuned to the provided database of irides pictures.
The training was done in a Google Colaboratory notebook with GPU support.
- number of classes:
50 - learning rate:
0.0002 - optimizer:
Adam - number of epochs:
100 - batch size:
16
- maximal training accuracy: 96.14%
- maximal validation accuracy: 93.00%
The system recognizes a user if the neural network underneath classifies an image with at least 98% confidence.
| Successful identification | Successful verification | |
|---|---|---|
| Registered users | 50 users (85.35% of all images) | 50 users (85.35% of all images) |
| Unknown users | 9 users (3.46% of all images) | NA |
This project was written in Python 3.8. To create Conda environment with all the system's requirements, run:
conda env create -f conda_environment.yml
Then proceed to activate the environment before using the biometric system:
conda activate iris
This system was trained on pictures from UBIRIS.v1 database.
From this dataset, 50 people were selected to
create the biometric system. Their pictures are stored at data/system_database/registered_users.
Additional 50 different people were selected to a validation set.
Their pictures are stored at data/system_database/unknown_users.
The entry point to the system is through the main file biometric_system.py.
usage: biometric_system.py [-h] [-u USER] [-m MODEL] image {identify,verify}
Biometric system.
positional arguments:
image Path to the image.
{identify,verify} Program mode. If you want to identify a user based on an image, choose 'identify'; If you want to verify whether an image portraits a particular user,
choose 'verify' and provide the user's ID in the next argument.
optional arguments:
-h, --help show this help message and exit
-u USER, --user USER User's ID. Only used with mode 'verify'.
-m MODEL, --model MODEL
Path to the trained classifier model.
The system correctly identified a user:
python3 biometric_system.py data/system_database/registered_users/7_0.jpg identify
This image portraits user 7 (Prediction probability: 99.87%)
Program exited with code: 0 - Successfully identified a user
The system was not able to recognize a user from their image because of low prediction probability (the eye was closed on the picture):
python3 biometric_system.py data/system_database/registered_users/45_8.jpg identify
Program exited with code: 1 - Could not identify a user - user was not found in the database
Successful verification:
python3 biometric_system.py data/system_database/registered_users/61_8.jpg verify --user 61
Successfully verified user 61 (Prediction probability: 99.94%)
Program exited with code: 0 - Successfully verified a user
User was not verified, since the provided ID was different from the classification:
python3 biometric_system.py data/system_database/registered_users/61_8.jpg verify --user 85
Program exited with code: 1 - Failed to verify a user - user ID did not match the classification
The system was not able to recognize a user from their image because of low prediction probability:
python3 biometric_system.py data/system_database/registered_users/46_2.jpg verify --user 46
Program exited with code: 1 - Failed to verify a user - user was not found in the database
Submitting an image of a user that is not registered in the system:
python3 biometric_system.py data/system_database/unknown_users/1_0.jpg identify
Program exited with code: 1 - Failed to verify a user - user was not found in the database