Deep Learning-Based Hand Gesture Recognition and Speech Conversion System: Let Gestures 'Speak'

This project was released by AV-Karthikeya on GitHub (Link: https://github.com/AV-Karthikeya/Hand-Gesture-Recognition-and-Speech-Conversion-using-Deep-Learning, release date: June 6, 2026). It combines MediaPipe hand tracking and artificial neural networks to build a real-time hand gesture recognition and speech conversion system, aiming to solve communication barriers between hearing-impaired individuals and able-bodied people. It can also be extended to scenarios such as smart homes, educational rehabilitation, etc. The system features real-time performance, low resource consumption, and scalable vocabulary.

Gestures are a natural human communication method, but the limited popularity of sign language leads to communication barriers between the hearing-impaired group (about 466 million globally, according to WHO statistics) and mainstream society. Breakthroughs in computer vision and deep learning technologies provide new possibilities to solve this problem, and this project builds an end-to-end system to lower the communication threshold.

The technical architecture consists of three parts: 1. MediaPipe hand key point detection: extracts 21 key point coordinates, with low data dimension and strong robustness; 2. TensorFlow/Keras-based neural network: inputs a 42-dimensional feature vector and recognizes gestures after training; 3. Speech synthesis module: converts text corresponding to gestures into speech. Workflow: video capture → hand detection → feature preprocessing → neural network inference → result determination → voice broadcast.

1. Real-time performance: achieves 30 frames per second on ordinary laptops, with a multi-threaded architecture decoupling each module; 2. Low resource consumption: lightweight model that runs smoothly on CPU; 3. Scalable vocabulary: users can add new gestures and retrain with a small number of samples.

1. Assistive communication for hearing-impaired: quickly express common needs; 2. Smart home control: contactless device operation; 3. Education and rehabilitation: sign language teaching aid, rehabilitation training records; 4. Industrial and medical fields: contactless operation to avoid contamination.

Current limitations: only supports static gestures, insufficient robustness in complex backgrounds/lighting, and limited vocabulary. Improvement directions: introduce temporal modeling to support continuous sign language; multi-modal fusion (facial expressions + lip movements); personalized adaptation; mobile deployment; offline operation.

The project demonstrates the value of AI in improving the lives of specific groups and emphasizes that technology should focus on social needs. Open-source tools (MediaPipe, TensorFlow) lower development thresholds and promote AI from the laboratory to application scenarios.