Cameras are everywhere. Videos and images have become one of the most
interesting data sets for artificial intelligence. Image processing is a quite
broad research area, not just filtering, compression, and enhancement. Besides,
we are even interested in the question, “what is in images?”, i.e., content
analysis of visual inputs, which is part of the main task of computer vision.
The study of computer vision could make possible such tasks as 3D
reconstruction of scenes, motion capturing, and object recognition, which are
crucial for even higher-level intelligence such as image and video
understanding, and motion understanding. For this 2 months project we will
## Emotions detection with Deep Learning
Cameras are everywhere. Videos and images have become one of the most interesting data sets for artificial intelligence.
Image processing is a quite broad research area, not just filtering, compression, and enhancement. Besides, we are even interested in the question, “what is in images?”, i.e., content analysis of visual inputs, which is part of the main task of computer vision.
The study of computer vision could make possible such tasks as 3D reconstruction of scenes, motion capturing, and object recognition, which are crucial for even higher-level intelligence such as image and video understanding, and motion understanding.
For this 2 months project we will
focus on two tasks:
- emotion classification
- face tracking
With the computing power exponentially increasing the computer vision field has
been developing exponentially. This is a key element because the computer power
allows using more easily a type of neural networks very powerful on images:
CNN's (Convolutional Neural Networks). Before the CNNs were democratized, the
algorithms used relied a lot on human analysis to extract features which
obviously time-consuming and not reliable. If you're interested in the "old
explains it. The history behind this field is fascinating!
[Here](https://kapernikov.com/basic-introduction-to-computer-vision/) is a
short summary of its history.
With the computing power exponentially increasing the computer vision field has been developing exponentially. This is a key element because the computer power allows using more easily a type of neural networks very powerful on images:
CNN's (Convolutional Neural Networks). Before the CNNs were democratized, the algorithms used relied a lot on human analysis to extract features which obviously time-consuming and not reliable. If you're interested in the "old
school methodology" [this article](towardsdatascience.com/classifying-facial-emotions-via-machine-learning-5aac111932d3)
explains it. The history behind this field is fascinating! [Here](https://kapernikov.com/basic-introduction-to-computer-vision/) is a short summary of its history.
### Project goal and suggested timeline
The goal of the project is to implement a **system that detects the emotion on
a face from a webcam video stream**. To achieve this exciting task you'll have
to understand how to:
The goal of the project is to implement a **system that detects the emotion on a face from a webcam video stream**. To achieve this exciting task you'll have to understand how to:
- deal with images in Python
- detect a face in an image
- train a CNN to detect the emotion on a face
That is why I suggest starting the project with a preliminary step. The goal of
this step is to understand how CNNs work and how to classify images. This
preliminary step should take approximately **two weeks**.
That is why I suggest starting the project with a preliminary step. The goal of this step is to understand how CNNs work and how to classify images. This preliminary step should take approximately **two weeks**.
Then starts the emotion detection in a webcam video stream step that will last
until the end of the project !
Then starts the emotion detection in a webcam video stream step that will last until the end of the project!
The two steps are detailed below.
### Preliminary:
- Take [this
course](https://www.coursera.org/learn/convolutional-neural-networks). This
course is a reference for many reasons and one of them is the creator:
**Andrew Ng**. He explains the basics of CNNs but also some more advanced
topics as transfer learning, siamese networks etc ... I suggest to focus on
Week 1 and 2 and to spend less time on Week 3 and 4. Don't worry the time
scoping of such MOOCs are conservative. You can
attend the lessons for free!
- Participate in [this
challenge](https://www.kaggle.com/c/digit-recognizer/code). The MNIST dataset
is a reference in computer vision. Researchers use it as a benchmark to
compare their models. Start first with a logistic regression to understand
how to handle images in Python. And then train your first CNN on this data
set.
- Take [this course](https://www.coursera.org/learn/convolutional-neural-networks). This course is a reference for many reasons and one of them is the creator: **Andrew Ng**. He explains the basics of CNNs but also some more advanced topics as transfer learning, siamese networks etc ...
I suggest to focus on Week 1 and 2 and to spend less time on Week 3 and 4. Don't worry the time scoping of such MOOCs are conservative. You can attend the lessons for free!
- Participate in [this challenge](https://www.kaggle.com/c/digit-recognizer/code). The MNIST dataset is a reference in computer vision. Researchers use it as a benchmark to compare their models.
Start first with a logistic regression to understand how to handle images in Python. And then train your first CNN on this data set.
### Face emotions classification
Emotion detection is one of the most researched topics in the modern-day
machine learning arena. The ability to accurately detect and identify an
emotion opens up numerous doors for Advanced Human Computer Interaction. The
aim of this project is to detect up to seven distinct facial emotions in real
time. This project runs on top of a Convolutional Neural Network (CNN) that is
built with the help of Keras whose backend is TensorFlow in Python. The facial
emotions that can be detected and classified by this system are Happy, Sad,
Angry, Surprise, Fear, Disgust and Neutral.
Emotion detection is one of the most researched topics in the modern-day machine learning arena. The ability to accurately detect and identify an emotion opens up numerous doors for Advanced Human Computer Interaction.
The aim of this project is to detect up to seven distinct facial emotions in real time. This project runs on top of a Convolutional Neural Network (CNN) that is built with the help of Keras whose backend is TensorFlow in Python.
The facial emotions that can be detected and classified by this system are Happy, Sad, Angry, Surprise, Fear, Disgust and Neutral.
Your goal is to implement a program that takes as input a video stream that
contains a person's face and that predicts the emotion of the person.
Your goal is to implement a program that takes as input a video stream that contains a person's face and that predicts the emotion of the person.
It is possible to find more information about on the challenge page.
Train a CNN on the dataset `train.csv`. Here is an [example of
architecture](https://www.quora.com/What-is-the-VGG-neural-network) you can
implement.
**The CNN has to perform more than 70% on the test set**. You can use the
`test_with_emotions.csv` file for this. You will see that the CNNs take a lot of time
to train. You don't want to overfit the neural network. I strongly suggest to
use early stopping, callbacks and to monitor the training using the
`TensorBoard`.
You have to save the trained model in `my_own_model.pkl` and to explain the
chosen architecture in `my_own_model_architecture.txt`. Use `model.summary())`
to print the architecture. It is also expected that you explain the iterations
and how you end up choosing your final architecture. Save a screenshot of the
`TensorBoard` while the model's training in `tensorboard.png` and save a plot
with the learning curves showing the model training and stopping BEFORE the
model starts overfitting in `learning_curves.png`.
- Optional: Use a pre-trained CNN to improve the accuracy. You will find some
huge CNN's architecture that perform well. The issue is that it is expensive
to train them from scratch. You'll need a lot of GPUs, memory and time.
**Pre-trained CNNs** solve partially this issue because they are already
trained on a dataset and perform well on some use cases. However, building a
CNN from scratch is required, as mentioned, this step is optional and doesn't
replace the first one. Similarly, save the model and explain the chosen
architecture.
- Download and unzip the [data here](https://assets.01-edu.org/ai-branch/project3/emotions-detector.zip).
This dataset was provided for this past [Kaggle challenge](https://www.kaggle.com/competitions/challenges-in-representation-learning-facial-expression-recognition-challenge/overview).
It is possible to find more information about on the challenge page. Train a CNN on the dataset `train.csv`. Here is an [example of architecture](https://www.quora.com/What-is-the-VGG-neural-network) you can implement.
**The CNN has to perform more than 70% on the test set**. You can use the `test_with_emotions.csv` file for this. You will see that the CNNs take a lot of time to train.
You don't want to overfit the neural network. I strongly suggest to use early stopping, callbacks and to monitor the training using the `TensorBoard`.
You have to save the trained model in `my_own_model.pkl` and to explain the chosen architecture in `my_own_model_architecture.txt`. Use `model.summary())` to print the architecture.
It is also expected that you explain the iterations and how you end up choosing your final architecture. Save a screenshot of the `TensorBoard` while the model's training in `tensorboard.png` and save a plot with the learning curves showing the model training and stopping BEFORE the model starts overfitting in `learning_curves.png`.
- Optional: Use a pre-trained CNN to improve the accuracy. You will find some huge CNN's architecture that perform well. The issue is that it is expensive to train them from scratch.
You'll need a lot of GPUs, memory and time. **Pre-trained CNNs** solve partially this issue because they are already trained on a dataset and perform well on some use cases. However, building a CNN from scratch is required, as mentioned, this step is optional and doesn't replace the first one. Similarly, save the model and explain the chosen architecture.
**Step 2**: **Classify emotions from a video stream**
- Use the video stream outputted by your computer's webcam and preprocess it to
make it compatible with the CNN you trained. One of the preprocessing steps
is: face detection. As you may have seen the training samples are imaged
centered on a face. To do so, I suggest using a pre-trained model to detect
faces. OpenCV for image processing tasks where we identify a face from a live
webcam feed which is then processed and fed into the trained neural network
for emotion detection. The preprocessing pipeline will be corrected with a
functional test in `preprocessing_test`:
- Use the video stream outputted by your computer's webcam and preprocess it to make it compatible with the CNN you trained. One of the preprocessing steps is: face detection. As you may have seen the training samples are imaged centered on a face.
To do so, I suggest using a pre-trained model to detect faces. OpenCV for image processing tasks where we identify a face from a live webcam feed which is then processed and fed into the trained neural network for emotion detection. The preprocessing pipeline will be corrected with a functional test in `preprocessing_test`:
- **Input**: Video stream of 20 sec with a face on it
- **Output**: 20 (or 21) images cropped and centered on the face with 48 x 48
grayscale pixels
- Predict at least one emotion per second from the video stream. The minimum
requirement is printing in the prompt the predicted emotion with its
associated probability. If there's any problem related to the webcam use as
input the recorded video stream.
For that step, I suggest again to use **OpenCV** as much as possible. This link
shows how to work with a video stream with OpenCV. OpenCV documentation may
become deprecated in the future. However, OpenCV will always provide tools to
work with video streams, so search on the internet for OpenCV documentation and
more specifically "OpenCV video streams".
[Here](https://docs.opencv.org/4.x/dd/d43/tutorial_py_video_display.html) you
can find a useful tutorial to get started using OpenCV.
- Optional: **(very cool)** Hack the CNN. Take a picture for which the
prediction of your CNN is **Happy**. Now, hack the CNN: using the same image
**SLIGHTLY** modified make the CNN predict **Sad**.
You can find an example on how to achieve this in [this
- Predict at least one emotion per second from the video stream. The minimum requirement is printing in the prompt the predicted emotion with its associated probability. If there's any problem related to the webcam use as input the recorded video stream.
For that step, I suggest again to use **OpenCV** as much as possible. This link shows how to work with a video stream with OpenCV. OpenCV documentation may become deprecated in the future. However, OpenCV will always provide tools to work with video streams, so search on the internet for OpenCV documentation and more specifically "OpenCV video streams".
[Here](https://docs.opencv.org/4.x/dd/d43/tutorial_py_video_display.html) you can find a useful tutorial to get started using OpenCV.
- Optional: **(very cool)** Hack the CNN. Take a picture for which the prediction of your CNN is **Happy**. Now, hack the CNN: using the same image **SLIGHTLY** modified make the CNN predict **Sad**.
You can find an example on how to achieve this in [this article](https://medium.com/@ageitgey/machine-learning-is-fun-part-8-how-to-intentionally-trick-neural-networks-b55da32b7196)
nprimo
2 months ago
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