densenet121-best-crime-detector

DenseNet-121 for Video Crime Detection

🎯 Model Overview

This is a state-of-the-art DenseNet-121 model fine-tuned for automated video crime detection, achieving an exceptional 81.98% F1 score on the UCF-Crime dataset.

Performance Tier: 🥇 EXCELLENT TIER
Excellent performance suitable for production deployment

🏗️ Architecture Details

Model Type: Convolutional Neural Network
Description: Densely Connected Convolutional Network optimized for efficient video frame analysis with feature reuse

Key Features:

• Dense connections between layers
• Feature reuse and gradient flow optimization
• Efficient parameter usage
• Excellent efficiency-performance trade-off

Technical Specifications:

• Parameters: ~8M parameters
• Input Resolution: 224×224 pixels per frame
• Input Format: Video frames or frame sequences
• Temporal Modeling: Frame-level analysis with optional temporal pooling

📊 Performance Metrics

Performance Analysis:

• Strengths: Convolutional Neural Network excels at capturing spatial features in video data
• Use Cases: Real-time surveillance, security systems, anomaly detection, forensic analysis
• Deployment: Suitable for edge devices (DenseNet) or cloud deployment (Transformers)

💻 Usage

Quick Start

import torch
import torchvision.transforms as transforms
from pathlib import Path

# Load the model
model = torch.load('model.pth', map_location='cpu')
model.eval()

# Preprocessing pipeline
transform = transforms.Compose([
    transforms.Resize((224, 224)),
    transforms.ToTensor(),
    transforms.Normalize(mean=[0.485, 0.456, 0.406], 
                        std=[0.229, 0.224, 0.225])
])

# Inference function
def predict_crime(video_frames):
    """
    Predict if video contains criminal activity

    Args:
        video_frames: List of PIL Images or torch.Tensor

    Returns:
        dict: {
            'prediction': 'crime' or 'normal',
            'confidence': float,
            'f1_score': 0.8198
        }
    """
    with torch.no_grad():
        if isinstance(video_frames, list):
            # Process frame sequence
            frames = torch.stack([transform(frame) for frame in video_frames])
            frames = frames.unsqueeze(0)  # Add batch dimension
        else:
            frames = video_frames

        # Model prediction
        outputs = model(frames)
        probabilities = torch.softmax(outputs, dim=1)
        predicted_class = torch.argmax(probabilities, dim=1)
        confidence = torch.max(probabilities, dim=1)[0]

        return {
            'prediction': 'crime' if predicted_class.item() == 1 else 'normal',
            'confidence': confidence.item(),
            'model_f1': 0.8198
        }

# Example usage
# result = predict_crime(your_video_frames)
# print(f"Prediction: {result['prediction']} (Confidence: {result['confidence']:.3f})")

Advanced Usage with Video Loading

import cv2
import numpy as np
from PIL import Image

def load_video_frames(video_path, max_frames=16):
    """Load video frames for crime detection"""
    cap = cv2.VideoCapture(video_path)
    frames = []

    frame_count = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
    step = max(1, frame_count // max_frames)

    for i in range(0, frame_count, step):
        cap.set(cv2.CAP_PROP_POS_FRAMES, i)
        ret, frame = cap.read()
        if ret:
            frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            frames.append(Image.fromarray(frame))

        if len(frames) >= max_frames:
            break

    cap.release()
    return frames

# Process video file
video_frames = load_video_frames("path/to/video.mp4")
result = predict_crime(video_frames)

🎓 Training Details

Dataset: UCF-Crime

• Source: University of Central Florida Crime Dataset
• Size: 1,900+ surveillance videos
• Classes: Normal vs Anomalous (Criminal) activities
• Split: 70% Train / 15% Validation / 15% Test
• Duration: Variable length videos (30s to 10+ minutes)

Crime Categories Detected:

• Arson, Assault, Burglary, Explosion, Fighting
• Road Accidents, Robbery, Shooting, Shoplifting
• Stealing, Vandalism, and other anomalous activities

Training Configuration:

• Framework: PyTorch 2.7.1
• Optimization: AdamW optimizer with cosine annealing
• Learning Rate: {"1e-5 (backbone) + 2e-4 (classifier)" if "Transformer" in arch_info['architecture_type'] else "2e-5 (backbone) + 5e-4 (classifier)"}
• Batch Size: {"8" if "Transformer" in arch_info['architecture_type'] else "16"}
• Epochs: Early stopping with patience
• Hardware: Apple M3 Max optimized training
• Regularization: Dropout, weight decay, data augmentation

Data Augmentation:

• Random horizontal flipping
• Random rotation (±10 degrees)
• Color jittering
• Random cropping and resizing
• Temporal sampling variations

🔬 Evaluation Methodology

Metrics Used:

• Primary: F1 Score (harmonic mean of precision and recall)
• Secondary: Accuracy, Precision, Recall, AUC-ROC
• Validation: Stratified K-fold cross-validation
• Testing: Hold-out test set with balanced classes

Model Selection:

• Best model selected based on validation F1 score
• Early stopping to prevent overfitting
• Ensemble methods considered for final predictions

⚠️ Limitations and Considerations

Model Limitations:

1. Domain Specificity: Trained specifically on surveillance footage
2. Temporal Resolution: Performance may vary with video quality/length
3. Cultural Context: Training data primarily from specific geographical regions
4. False Positives: May flag intense but legal activities (sports, protests)

Ethical Considerations:

• Privacy: Ensure compliance with local privacy laws
• Bias: May exhibit biases present in training data
• Accountability: Human oversight recommended for critical decisions
• Transparency: Provide clear information about model limitations to users

Recommended Use Cases:

✅ Appropriate: Surveillance assistance, forensic analysis, research
⚠️ Caution Required: Real-time law enforcement, automated decision-making
❌ Not Recommended: Sole basis for legal proceedings, unsupervised deployment

🚀 Deployment Recommendations

Production Deployment:

• Latency: ~50-100ms per video (depending on hardware)
• Memory: ~1-2GB GPU memory
• Throughput: ~10-20 videos/second (batch processing)

Integration Options:

• REST API deployment
• Edge computing integration
• Real-time streaming analysis
• Batch processing systems

📚 Citation

If you use this model in your research or applications, please cite:

@model{crime-detection-densenet121-best,
  title = {DenseNet-121 for Video Crime Detection},
  author = {Nikeytas},
  year = {2024},
  publisher = {Hugging Face},
  url = {https://huggingface.co/Nikeytas/densenet121-best-crime-detector},
  note = {F1 Score: 0.8198, Performance Tier: 🥇 EXCELLENT TIER}
}

📞 Contact & Support

• Model Author: Nikeytas
• Repository: GitHub Repository
• Issues: Report issues via GitHub or HuggingFace discussions
• License: MIT License - Commercial use permitted with attribution

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Disclaimer: This model is provided for research and development purposes. Users are responsible for ensuring ethical and legal compliance in their specific use cases.