Rock Paper Scissors Hand Gesture Detection

This project implements a Rock Paper Scissors game using Python, OpenCV, and MediaPipe. It allows a user to play the game against the computer by showing hand gestures that are recognized in real time.

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Features

• Hand Gesture Detection: Uses MediaPipe to detect hand gestures and classify them as rock, paper, or scissors.
• Real-Time Gameplay: Processes webcam input to detect gestures and compare them against a random choice by the computer.
• Scoring System: Tracks user and computer scores during the game.
• Interactive Interface:
  • Countdown before detecting gestures.
  • Display results after each round.
  • Option to reset the game.

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Logic

To determine whether the user has chosen Rock, Paper, or Scissors, we analyze the hand landmarks represented as x, y coordinates, as shown in the image above. Each choice is identified by interpreting whether a finger is flexed or stretched based on the positions of its joints.

Identifying Flexed or Stretched Fingers

We use Euclidean distance to measure the geometry of each finger. Here’s the process:

1. Measure Total Finger Length:

   • Calculate the distances between the fingertip, the two middle joints, and the base of the finger.
   • Sum these distances to find the total finger length.

2. Measure Tip-to-Base Distance:

   • Compute the straight-line distance from the fingertip to the base of the finger.

3. Determine Flexion or Extension:

   • Divide the tip-to-base distance by the total finger length to get a ratio.
   • If this ratio is equal to or greater than 0.9, the finger is considered stretched (nearly straight). Otherwise, it is flexed.

Applying Rock-Paper-Scissors Logic

Based on the flexion or extension of specific fingers, the user’s hand gesture is classified as Rock, Paper, or Scissors:

• Rock: All fingers are flexed.
• Paper: All fingers are stretched.
• Scissors: Only the index and middle fingers are stretched, while the rest are flexed.

Using this logic, we can determine the user’s choice and evaluate the winner of the Rock-Paper-Scissors game.

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Installation

1. Clone the Repository:

   git clone https://github.com/RonMordo/rock_paper_scissors_visual_app.git

2. Chane directory to the cloned repository:

   cd rock_paper_scissors_visual_app

3. Create the virtual environment using the setup script:

   ./setup_env.sh

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   Usage

   Make sure your activating the virtual environment in every new terminal session:

   source venv/bin/activate

   Run the app:

   python3 rock_paper_scissors_app.py

   How to play:
   Press S to start the countdown or Q to quit.
   You have 3 seconds to decide Paper, Rock or Scissors, the final gesture will be taken as your choice.
   In the result screen you can press R to play again or Q to quit.