# Changelog

All notable changes to FaceZK will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [1.0.0] - 2024-01-XX

### Added
- 🎉 **Initial Production Release**
- **Core Face Detection & Analysis**
  - Real-time face detection using MediaPipe
  - Face mesh extraction (468 points)
  - Face descriptor generation (128-dimensional)
  - Age and gender prediction
  - Emotion recognition (7 emotions)
  - Iris tracking and analysis
  - Head pose estimation (yaw, pitch, roll)
  - Anti-spoofing detection

- **Biometric Template System**
  - Structured biometric template extraction
  - Template serialization and validation
  - Confidence scoring for all features
  - Timestamp and metadata tracking

- **Fuzzy Biometric Hashing**
  - Locality-sensitive hashing (LSH) implementation
  - Configurable similarity thresholds
  - Multiple normalization methods (L2, minmax, zscore)
  - Stable feature extraction for lighting/angle tolerance
  - Hamming distance-based similarity calculation

- **Liveness Detection**
  - Multi-frame analysis for liveness verification
  - Blink detection and eye movement tracking
  - Head movement analysis
  - Anti-spoofing integration
  - Configurable liveness thresholds

- **Production Features**
  - TypeScript support with full type definitions
  - Browser and Node.js compatibility
  - WebGL and WASM backend support
  - Memory management and cleanup
  - Error handling and recovery
  - Event-driven architecture
  - Session management

- **Demo Application**
  - Interactive web demo with real-time analysis
  - Performance monitoring and debugging
  - Fuzzy hash comparison testing
  - Responsive UI with status indicators
  - Camera integration and video processing

### Security
- ✅ No server-side biometric storage
- ✅ Local-only fuzzy hash generation
- ✅ Deterministic hash functions
- ✅ Configurable security thresholds
- ✅ Privacy-preserving design

### Performance
- ⚡ Real-time processing (30+ FPS)
- ⚡ Optimized memory usage
- ⚡ Efficient tensor operations
- ⚡ Background processing support

### Browser Support
- 🌐 Chrome 88+
- 🌐 Firefox 85+
- 🌐 Safari 14+
- 🌐 Edge 88+

## [0.9.0] - 2024-01-XX

### Added
- Initial beta release
- Basic face detection integration
- Template extraction framework
- Fuzzy hashing prototype

### Changed
- Improved accuracy and performance
- Enhanced error handling
- Better documentation

## [0.8.0] - 2024-01-XX

### Added
- Alpha release
- Core architecture
- Human library integration
- Basic demo implementation

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## Versioning

- **Major** (X.0.0): Breaking changes, major new features
- **Minor** (0.X.0): New features, backward compatible
- **Patch** (0.0.X): Bug fixes, performance improvements

## Migration Guide

### From 0.9.0 to 1.0.0
- Update import paths to use new package name `facezk-core`
- Replace `generateBiometricId` with `generateFuzzyHash`
- Update configuration object structure
- Review liveness detection thresholds

### From 0.8.0 to 0.9.0
- Update Human library integration
- Review template structure changes
- Update demo application

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For detailed migration instructions, see the [Migration Guide](MIGRATION.md).