Charmi Mehta
Business Analyst | UX Enthusiast

Binary Color Classification for Brain Computer Interface using Neural Networks and Support Vector Machines

Abstract

As the power of modern computers grows alongside our understanding of the human brain, we move a step closer in transforming some pretty spectacular science fiction into reality. The advent of Brain Computer Interface (BCI) is indeed leading us to a burgeoning era of complete automation empowering our interaction with computer not only with robustness but with also a gift of intelligence. For the fraction of our society suffering from severe motor disabilities BCI has offered a novel solution of overcoming the problems faced in communicating and environment control. Thus the purpose of our current research is to harness the brain's ability to generate Visually Evoked Potentials (VEPs) by capturing the response of the brain to the transitions of color from grey to green and grey to red. Our prime focus is to explore EEG-based signal processing techniques in order to classify two colors; which can be further deployed in future by coupling the actuators so as to perform few basic tasks.
The extracted EEG features are classified using Support Vector Machines (SVM) and Artificial Neural Networks (ANN).

We recorded 100% accuracy on testing the model after training and validation process. Moreover, we obtained 90% accuracy on re-testing the model with all samples acquired for the task using Quadratic SVM classifier.

Binary Color Classification approach

Followed the below process to classify the EEG signals:

  • Data Acquisition
  • Data Processing
  • Feature Extraction and Selection
  • Classification
Classification algorithms:
  • Artificial Neural Networks - Back propagation, Gradient Descent, Scaled Conjugate Gradient
  • Support Vector Machines - Nonlinear transformation with kernels, Quadratic SVM
Platform & Tools:

MATLAB, EEGLAB, Neural Network Toolbox, Microsoft Excel

Published Paper

Here is a link to the project paper that got published in the IJERA Journal showcasing the entire process we followed for the project along with the accuracy results.

Project Team

Project Guide:
Dr. Alice Cheeran

Team members:
Charmi Mehta
Damini Chopra
Nidhi Mavani
Keval Goradia