Emotion detection using deep learning

Introduction

This project aims to classify the emotion on a person's face into one of seven categories, using deep convolutional neural networks. The model is trained on the FER-2013 dataset which was published on International Conference on Machine Learning (ICML). This dataset consists of 35887 grayscale, 48x48 sized face images with seven emotions - angry, disgusted, fearful, happy, neutral, sad and surprised.

Dependencies

• Python 3, OpenCV, Tensorflow
• To install the required packages, run pip install -r requirements.txt.

Basic Usage

The repository is currently compatible with tensorflow-2.0 and makes use of the Keras API using the tensorflow.keras library.

• First, clone the repository and enter the folder

git clone https://github.com/atulapra/Emotion-detection.git
cd Emotion-detection

• Download the FER-2013 dataset from here and unzip it inside the src folder. This will create the folder data.

• If you want to train this model, use:

cd src
python emotions.py --mode train

• If you want to view the predictions without training again, you can download the pre-trained model from here and then run:

cd src
python emotions.py --mode display

• The folder structure is of the form:
  src:

  • data (folder)
  • emotions.py (file)
  • haarcascade_frontalface_default.xml (file)
  • model.h5 (file)

• This implementation by default detects emotions on all faces in the webcam feed. With a simple 4-layer CNN, the test accuracy reached 63.2% in 50 epochs.

Data Preparation (optional)

• The original FER2013 dataset in Kaggle is available as a single csv file. I had converted into a dataset of images in the PNG format for training/testing and provided this as the dataset in the previous section.

• In case you are looking to experiment with new datasets, you may have to deal with data in the csv format. I have provided the code I wrote for data preprocessing in the dataset_prepare.py file which can be used for reference.

Algorithm

• First, the haar cascade method is used to detect faces in each frame of the webcam feed.

• The region of image containing the face is resized to 48x48 and is passed as input to the CNN.

• The network outputs a list of softmax scores for the seven classes of emotions.

• The emotion with maximum score is displayed on the screen.

Example Output

References

• "Challenges in Representation Learning: A report on three machine learning contests." I Goodfellow, D Erhan, PL Carrier, A Courville, M Mirza, B Hamner, W Cukierski, Y Tang, DH Lee, Y Zhou, C Ramaiah, F Feng, R Li,
  X Wang, D Athanasakis, J Shawe-Taylor, M Milakov, J Park, R Ionescu, M Popescu, C Grozea, J Bergstra, J Xie, L Romaszko, B Xu, Z Chuang, and Y. Bengio. arXiv 2013.