A Deep Neural Network Framework for Automated Crime Detection and Video Summarization

Abstract

The exponential growth of closed-circuit television (CCTV) infrastructure has far outpaced the capacity of human operators to monitor footage in real time, leaving a critical gap between data acquisition and actionable situational awareness. This paper proposes a unified deep neural network framework that jointly performs automated crime (anomalous-event) detection and attention-guided video summarization from untrimmed surveillance streams. The framework couples a 3D convolutional feature extractor with a bidirectional long short-term memory (BiLSTM) temporal encoder and a self-attention module to model both short-range spatial cues and long-range temporal dependencies characteristic of criminal activities such as assault, robbery, arson, and shooting. The learned frame-level attention scores are re-used, without additional supervision, to drive a diversity-aware keyframe selection module that automatically compresses hours of footage into a compact, timestamped evidentiary summary whenever an anomalous segment is detected. The proposed system was evaluated on the UCF-Crime and DCSASS benchmark datasets for detection and on TVSum/SumMe-style protocols for summarization quality. Experimental results indicate that the framework attains a detection accuracy of 98.4%, an F1-score of 0.978, and an AUC of 0.991, outperforming C3D, two-stream CNN, and CNN-LSTM baselines by 3.4-16.0 percentage points, while the attached summarization module achieves an F-score of 0.71 with a video compression ratio exceeding 92% and end-to-end inference throughput of 41 frames per second on a single consumer-grade GPU. These results demonstrate that combining anomaly-aware attention with keyframe extraction in a single trainable pipeline yields both higher detection fidelity and immediately actionable, human-reviewable video summaries, making the framework well suited for real-time deployment in smart-city and public-safety surveillance infrastructures.