Cloudinary Blog

Facial-Surveillance System for Restricted Zones

By Ore Ogundipe
Facial-Surveillance System for Restricted Zones

Ore Ogundipe Ore Ogundipe is a Software Engineer with specializations in Web Development, Machine Learning and Computer Vision.

In Africa, where Internet access and bandwidth are limited, it’s not cost-effective or feasible to establish and maintain a connectivity for security and surveillance applications. That challenge makes it almost impossible to build a service that detects, with facial-recognition technology, if someone entering a building is authorized to do so. To meet the final-year research requirement for my undergraduate studies, I developed a facial-surveillance system. Armed with a background in computer vision, I decided to push the limits and see if I could build a surveillance system that does not require recording long video footage.

Gratifyingly, I succeeded and was able to build an offline, real-time facial-surveillance system that comprises two parts:

  • A vision system.
  • A web interface that enables you to see, in real time, the identity of someone who has entered a building and determine if that person has been preauthorized to be there.

Related Technologies

I built the system with several technologies, as follows:

  • Python (OpenCV and Tensorflow) for the vision segment
  • Laravel PHP for the administrative dashboard
  • Pusher for triggering of real-time events
  • Cloudinary for uploading and serving images to the administrative dashboard

System Capabilities

Here is how the system works.

Training the System

“Facial “Facial

First, the system is “trained” to perform a few critical tasks, as follows:

The system takes about 20 facial images of each of the individuals who are authorized to enter the building and then saves the images locally on the device with a unique ID for each person. The system sends the unique IDs as an API call to the web server for the purpose of tracking those people with entrance privilege. The system aligns all the images and then uses them in the local storage to retrain the last layer of FaceNet, a deep, neural Google network that enables face identification and clustering with the images of the people with entrance privilege. Image embeddings become available as a result. The system fits a Support Vector Classifier with the extracted embeddings for the preauthorized people. This classifier can then recognize human faces.

Performing Face Recognition Offline

Clicking the button for running facial surveillance opens a live video stream. Then, for every frame (picture) in the video stream, the system attempts to detect a face. If no face is detected, the system moves to the next frame. In case of a detection, the system obtains the facial embeddings from FaceNet and then feeds them to the classifier for prediction, that is, determine how similar the extracted embedding for the detected face is to the faces of the preauthorized people.

An 80-percent similarity to an preauthorized face authenticates the person entering the building. Otherwise, the system flags that person as a suspect. In case of authentication, the system broadcasts a message to the security panel, informing the people concerned, for example, security personnel, that an authorized face has been spotted.

All the computations take place on the local machine without any calls to the web server until the system determines the person entering the building has entrance privilege.

Working Demo of System Recognizing an Authorized Member Working Demo of a System Recognizing an Authorized Building Entrant

Uploading Suspect Images With Cloudinary

As a final step, I needed to upload the face of any suspect identified by the system and reference the image afterwards. For that task, I chose Cloudinary because of its simple and straightforward integration process with no overhead at all.

To get started, I installed the Cloudinary module for Python with the following command:

pip install cloudinary

Afterwards, I imported the module into my codebase and then configured the module, as follows:

import cloudinary
from cloudinary.uploader import upload

# configure the cloudinary module
# determine if detected face is suspect or not
# save image of suspected face from frame
cloudinary_resp = upload(image_loc, public_id=time_string)
# the url of the uploaded image is stored as part of the response of uploading the image : cloudinary_resp['url']
message = {'type': 'unverified', 'time': current_time.strftime("%Y-%m-%d %H:%M"), 'image_url': cloudinary_resp['url']}
# this message is then broadcast using pusher

When uploading an image with Cloudinary, specify the public ID (public_id) as an identification of that image. For easy reference, I set the the time the suspect was spotted as the value of public_id.

If the system spots a suspect, the administrative dashboard would look like this:

System Spotting a new unauthorized human

Thanks to Cloudinary’s intuitive interface and robust capabilities, image uploads and display for my facial-surveillance project was a breeze. What a great platform!

Recent Blog Posts

Rotating Or Removing Image Backgrounds With Cloudinary

As a rule, user interfaces, whether for mobile or desktop apps, encompass a significant amount of visual media (images and videos), necessitating close collaboration among designers and front-end developers. The process for building UIs entails a designer-to-developer handoff, at which the designer transfers to the developer blueprints produced with such tools as Photoshop, InVision, and Sketch. The developer then implements the blueprints with Cascading Style Sheets (CSS).

Read more

Open Hack Week: Building for the Future

By Obinna Ekwuno
Open Hack Week in Lagos, Nigeria: Building for the Future

Between July 29 and August 3, the Google Developer Student Community of the University of Lagos, Nigeria participated in a week-long hackathon called Open Hack Week (OHW). Sponsored by Cloudinary, Interswitch, the Ogundipe Foundation, and other notable organizations, OHW comprised 14 teams, five developers each. After six days of brainstorming and coding, the teams successfully built the minimum viable products (MVPs) for their projects, which they subsequently presented to all the attendees.

Read more
Compress Images for Web and Boost Performance on Your Site

Slow-loading web content and problematic media displays that involve seemingly interminable scrolling tick off users to no end. Compressing online images is, without question, a critical task for spearheading customer retention for websites. Keep in mind that small images can still look sharp. This article shows you how to achieve that by mastering the techniques of compressing images for the web.

Read more
Customize your video player with Cloudinary Studio

Steve Forbes, editor of Forbes Magazine, once said, “Your brand is the single most-important investment you can make in your business”. That bold statement is spot on, especially with respect to digital media. Furthermore, consistency in brand experience is crucial for building trust with users.

Read more
How to Create WordPress Responsive Images

With the advent of technology and the attendant fast-growing demand for feature-rich computing devices (laptops, smartphones, iPads), their manufacturers are rising to the occasion by producing high-resolution machines with screens of various sizes and device-pixel ratios. Thus was born the impetus behind the need for and creation of responsive images, which automatically optimize their online display according to the size and resolution of the device screen, ensuring sharpness and crispness—a delightful user experience.

Read more