SecureWall logoSecureWall AI: Graffiti Sound Recognition Software

The U.S. city municipality partnered with Apiko to develop an AI-driven sound recognition software to prevent vandalism. SecureWall AI detects the sound of shaking a graffiti spray can in real time, and automatically delivers alerts and evidence clips to the authorities.

Secure Wall desktop image

* the screenshots used in this portfolio case contain fictitious data used for illustrative purposes

Overview

  • AI software engineer,
    DevOps engineer

  • IoT application

  • United States

  • Public safety, surveillance monitoring

  • Discovery phase, AI software development

  • March 2025 – today

Secure Wall Story

Project idea

Municipalities invest heavily in street surveillance and public infrastructure, yet vandalism incidents like graffiti still slip through because monitoring is mostly reactive. CCTV footage is typically reviewed after a complaint is filed – when the damage is already done and the chances of identifying the person are low. Even when cameras capture the event, finding the right moment in hours of video is a slow manual work.

The core challenge is that motion detection isn’t specific enough. Streets are full of “normal” movement – pedestrians, cars, animals, changing light – so movement-based triggers generate noise and false alarms. At the same time, municipalities can’t justify 24/7 human monitoring. Besides, they often need to work within existing camera infrastructure and limited response capacity.

SecureWall AI was initiated to close this gap by adding an audio-based signal to the workflow. Shaking the graffiti stick has a distinctive sound profile, and recognizing it in real time makes it possible to detect graffiti right before it’s about to happen.

At the same time, the cameras are set to automatically capture the relevant video fragment, and instantly notify responsible teams via email/SMS. The result is a practical, scalable way to turn city cameras into an early-warning system – starting with a municipal deployment in one of the U.S. cities.

Challenges & Solutions

  • Defined the real-world vandalism detection challenge with the client and clarified what “success” looks like for a municipal rollout.
  • Completed the IoT application workflow mapping – from sound detection to evidence capture to notifications – so city teams can act quickly.
  • Agreed on the essential capabilities for the first release and set clear priorities to keep delivery focused.
  • Created a practical implementation plan that fits timeline and budget constraints while leaving room for future scaling.
Outcome: A clear, shared product direction that allowed the team to build the right sound recognition technology fast, validate it early, and avoid unnecessary scope or rework.

SecureWall AI: key features of sound recognition software

Detection workflow
Detection workflow
  • The software connects to street video monitoring cameras, and reads live streams when the particular sound is detected.
  • It separates audio from video, and runs continuous audio analysis to recognize a spray paint can sound pattern.
  • It triggers an event only when detection meets confidence/threshold rules to avoid noisy false alarms.
Evidence capture
Evidence capture
  • Anti-vandalism software records video in rolling segments so the system can preserve the moment someone starts spray-painting.
  • When an event is detected, it extracts the relevant fragment (with configurable pre/post context) and packages it as a clip.
  • It attaches event metadata from the sound activated camera (timestamp, camera identifier, detection score) to support quick triage.
Alerts and event history
Alerts and event history
  • Automated alerts via email and SMS with a direct link to the evidence clip and key context.
  • Structured event history for auditing and performance review (detections, delivery status, and timestamps).
  • Operational follow-up by making it easy to track repeated incidents by location and time patterns.

Integrations

integrations

Technologies

  • Python
  • PostgresQL
Outcome

SecureWall AI: Sound recognition software development outcome

SecureWall AI is a proactive solution for vandalism prevention. It detects the sound of shaking a graffiti stick in real time, and captures the relevant video moment automatically. Responsible teams receive immediate email/SMS alerts with a clip link.

Apiko sound recognition technology qualitatively detects the warning sounds amidst the city street noise. In addition, it reduces manual footage review, speeds up response, and provides clear evidence for follow-up – all while keeping the solution lightweight enough to expand to additional locations.

Looking to build sound recognition software for your particular requirements? Apiko team designs, develops, and implements sound recognition technologies for various industries and applications.