Deep Learning-Based Hand Gesture Recognition System and Design of a Human-Machine Interface

Hand gesture recognition plays an important role in developing effective human-machine interfaces (HMIs) that enable direct communication between humans and machines. But in real-time scenarios, it is difficult to identify the correct hand gesture to control an application while moving the hands. To address this issue, in this work, a low-cost hand gesture recognition system based human-computer interface (HCI) is presented in real-time scenarios. The system consists of six stages: (1) hand detection, (2) gesture segmentation, (3) feature extraction and gesture classification using five pre-trained convolutional neural network models (CNN) and vision transformer (ViT), (4) building an interactive human-machine interface (HMI), (5) development of a gesture-controlled virtual mouse, (6) smoothing of virtual mouse pointer using of Kalman filter. In our work, five pre-trained CNN models (VGG16, VGG19, ResNet50, ResNet101, and Inception-V1) and ViT have been employed to classify hand gesture images. Two multi-class datasets (one public and one custom) have been used to validate the models. Considering the model's performances, it is observed that Inception-V1 has significantly shown a better classification performance compared to the other four CNN models and ViT in terms of accuracy, precision, recall, and F-score values. We have also expanded this system to control some multimedia applications (such as VLC player, audio player, playing 2D Super-Mario-Bros game, etc.) with different customized gesture commands in real-time scenarios. The average speed of this system has reached 25 fps (frames per second), which meets the requirements for the real-time scenario. Performance of the proposed gesture control system obtained the average response time in milisecond for each control which makes it suitable for real-time. This model (prototype) will benefit physically disabled people interacting with desktops.