captcha_data/Static_Jigsaw/README.md

Jigsaw Puzzle CAPTCHA Generator

This directory contains the Jigsaw Puzzle CAPTCHA implementation with automatic puzzle generation.

How It Works

The Jigsaw Puzzle CAPTCHA can generate unlimited random puzzles by:

1. Taking source images from the sources/ directory
2. Randomly selecting one image
3. Splitting it into a grid (2x2 or 3x3 pieces)
4. Creating puzzle pieces that users must drag to complete

Setup

1. Install Pillow (if not already installed):

   pip install pillow
   # or
   uv add pillow
   

2. Add Source Images:

   • Place any images (PNG, JPG, JPEG) in the sources/ directory
   • The generator will automatically use these images
   • Recommended: Use images that are visually distinct and easy to recognize
   • Images will be automatically resized to fit the puzzle grid

Configuration

Edit ground_truth.json to configure the generator:

{
  "config": {
    "generate_random": true,           // Enable random generation
    "source_images_dir": "captcha_data/Static_Jigsaw/sources",
    "grid_rows": 2,                    // 2 or 3 (rows in grid)
    "grid_cols": 2,                    // 2 or 3 (columns in grid)
    "piece_size": 150                   // Size of each piece in pixels
  }
}

Features

• Infinite Puzzles: Each request generates a new unique puzzle
• Easy for Humans: Small grid sizes (2x2 or 3x3) make it easy to solve
• Random Source Selection: Randomly picks from available source images
• Automatic Sizing: Images are automatically resized to fit the grid
• Base64 Encoding: Pieces are embedded as data URLs (no file storage needed)
• Reference Image: Shows the complete image as a hint

Grid Sizes

• 2x2: 4 pieces (easiest)
• 3x3: 9 pieces (medium difficulty)
• Maximum is 3x3 to keep it easy for humans

Example Usage

1. Add images to sources/ directory
2. The system will automatically generate puzzles using these images
3. Each puzzle request creates a new random puzzle
4. Pieces are shuffled and presented to the user
5. User drags pieces to complete the puzzle

Fallback

If generation fails or generate_random is false, the system falls back to using predefined puzzles from ground_truth.json (like jigsaw0).