Surveillance Video Annotation for Entrance Monitoring

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We annotated 90 minutes of video footage from a factory entrance surveillance system, reducing the number of frames from 50-60 thousand to just 8 thousand. We implemented neural network-based pre-annotation, refined the data manually, and conducted final validation to ensure precise matching of employees with their IDs.

Industry Surveillance & Security
Data 90 minutes of video from three cameras, approximately 50-60 thousand frames
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Industry Surveillance & Security
Data 90 minutes of video from three cameras, approximately 50-60 thousand frames

Task

The client approached us with an interesting challenge: to annotate surveillance footage from a factory entrance to enable automatic employee identification and ID matching with the access control system. The video contained footage from three different angles: two cameras inside the entrance area and one monitoring the exit.

This project presented several unique challenges that required creative problem-solving and workflow adjustments:

  • The initial data volume significantly slowed down processing.
  • The neural network’s pre-annotation had inaccuracies, requiring manual refinement.
  • Introducing a frame-cutting stage extended the timeline but substantially improved the final quality.

Solution

  • 01

    Preprocessing the Video:

    • Filtering Footage: Up to 80% of frames contained irrelevant data, so we implemented a video-cutting stage.
    • Optimizing Data Volume: After processing, the total number of frames was drastically reduced.
  • 02

    Data Annotation:

    • Neural Network Pre-Annotation: Automatic detection of people in the footage.
    • Manual Refinement: Removal of false detections and precise object boundary adjustments.
  • 03

    Automated ID Matching:

    • Developed a script to automatically match employee IDs with the annotated footage.
  • 04

    Validation & Quality Control:

    • Verified pre-annotation accuracy and corrected errors.
    • Final validation with object boundary refinements to enhance precision.

Results

  • Optimized workflow reduced the frame count from 50-60 thousand to 8 thousand per dataset.

  • Neural network pre-annotation accelerated the annotation process.

  • Improved annotation quality through thorough filtering and precise object boundary adjustments.

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