Tag Archives: rekognition

An Overview of Real-time Video Analysis with Amazon Rekognition

Amazon Rekognition Video offers real-time video analysis for streaming videos, and it’s tailored to handle video streams seamlessly. Using Rekognition Video, you can identify and recognize faces in real-time, detect unsafe content, and track people, among other features.

Here’s how Amazon Rekognition works with video streams:

1. Integration with Amazon Kinesis Video Streams

Rekognition Video is integrated with Amazon Kinesis Video Streams, which captures, processes, and stores video streams for analytics and machine learning. Here’s a basic flow:

  1. Capture: Stream your video using Kinesis Video Streams.
  2. Analyze: Use Rekognition Video to process the stream and analyze the content.
  3. Act: Obtain insights in real-time and act on them, like triggering alerts.

2. Key Features

2.1. Real-time Face Recognition

  • Recognize faces: You can identify persons of interest in real-time.
  • Face search: You can match faces from the live video against a database of face images that you’ve stored.
  • Face metadata: Extract attributes like gender, age range, emotions, and more.

2.2. Person Tracking

Track persons even when they are partially hidden from view in your video, such as when they go behind an object. This powerful feature offers:

  • Robustness: Even when a person is partially obscured, such as when they walk behind a piece of furniture or another person, the system can continue to track their movement.
  • Pathing: Gain insights into the trajectories individuals take within a video frame. This can be especially useful in understanding patterns in crowded places or monitoring specific zones.
  • Integration with other features: Combine person tracking with facial recognition to not only track an individual but also identify them. This can be beneficial for security or access control purposes.
  • Use cases: From surveillance systems to customer behavior analysis in retail environments, the applications of person tracking are vast and versatile.

2.3. Unsafe Content Detection

Identify potentially unsafe or inappropriate content in your video streams. This feature’s capabilities include:

  • Real-time Monitoring: Scan live video streams to detect and flag any content that may be deemed inappropriate, ensuring timely interventions.
  • Classification: The content is classified into various categories, such as violence, nudity, or any other custom category, allowing for nuanced content filtering.
  • Contextual Analysis: Beyond just object and scene detection, the system understands the context. This helps reduce false positives where a potentially unsafe object might be present but in a harmless context.
  • Applications: This feature can be crucial for content platforms that need to maintain community guidelines, for businesses that want to ensure their advertisement appears alongside safe content, or for parental controls in digital media offerings.
  • Customization: Over time, you can train the system to better understand what you categorize as “unsafe” based on feedback and specific requirements.

3. Setting It Up

Here’s a high-level approach to setting up real-time video analysis:

  1. Set up a Kinesis Video Stream: This will be your source of video data.
  2. Connect your video source: This could be a camera or any other source of video data.
  3. Use Kinesis Video SDK: This SDK helps stream the video to your Kinesis Video Stream.
  4. Create a Rekognition Video Stream Processor: This will process your video and analyze it. Set up the specific features you want (like face detection).
  5. Start the stream processor: Once started, Rekognition will begin analyzing the video content in real-time.
  6. Handle the results: The analyzed results can be sent to another Kinesis stream (like Kinesis Data Streams). From there, you can act on the results, like triggering Lambda functions or storing insights in a database.

4. Considerations

  • Latency: Real-time analysis introduces some latency. Ensure that this latency is acceptable for your application.
  • Cost: Streaming video analysis can be more costly than batch processing of stored videos. Monitor usage and set up alerts.
  • API Limits: Understand the limits of the Rekognition Video API to avoid throttling.

In conclusion, Amazon Rekognition Video provides a powerful platform for real-time video analysis when paired with Kinesis Video Streams. It enables applications in security, monitoring, user engagement, content moderation, and more. Always refer to the official AWS documentation for the most up-to-date and detailed information.

Guide to Learning the Amazon Rekognition Platform and API


Amazon Rekognition is a service that allows developers to add image and video analysis to their applications. With it, you can detect objects, scenes, faces, identify celebrities, and even spot potentially unsafe content. This guide will walk you through the basics of the platform and its API.


  1. AWS Account: Before diving in, make sure you have an Amazon Web Services (AWS) account.
  2. AWS CLI: Install the AWS Command Line Interface (CLI). It’s a handy tool for interacting with AWS services.
  3. Programming experience: Familiarity with a programming language like Python, JavaScript, or Java will be helpful.

1. Getting Started

1.1. Setting Up Your Environment

  1. IAM: Before you begin, set up an IAM user in the AWS Console with the necessary permissions to access Rekognition. Always avoid using root user credentials.
  2. AWS SDK: Amazon Rekognition is accessible via the AWS SDKs available for various languages. Depending on your language of choice, you may want to set up the SDK. For this guide, we’ll use Python with the Boto3 library.

1.2. Exploring the Console

Amazon Rekognition provides a web-based console where you can try out many of its features without writing any code. Before diving deep into the API:

  1. Navigate to the Amazon Rekognition Console in your AWS Dashboard.
  2. Explore the various options available, like image and video analysis.

2. Diving into the API

2.1. Analyzing Images

There are several functions provided by the Rekognition API to analyze images:

  1. DetectLabels: Detect objects, people, scenes, and activities.
  2. DetectFaces: Detect facial features and attributes.
  3. CompareFaces: Compare two faces and see how similar they are.
  4. RecognizeCelebrities: Identify famous individuals in your images.

Example: Detecting Labels using Python and Boto3

import boto3 client = boto3.client('rekognition') response = client.detect_labels( Image={ 'S3Object': { 'Bucket': 'your-bucket-name', 'Name': 'your-image-name.jpg' } }, MaxLabels=10 ) print(response['Labels'])

2.2. Working with Videos

Rekognition’s video analysis functions similarly to its image functions, but due to the asynchronous nature of video analysis, you’ll often start an analysis task and get results later.

Some key video functions include:

  1. StartLabelDetection
    • Purpose: Initiates the asynchronous detection of labels in a video.
    • How it Works: Once started, this function processes video frames to identify objects, scenes, and activities, such as “bicycle,” “tree,” or “walking.”
    • Applications: Can be used in video surveillance for object monitoring, content generation for tagging video content, and more.
  2. StartFaceDetection
    • Purpose: Begins the asynchronous detection of faces within a video.
    • How it Works: This function scans video frames to identify and locate faces. For each detected face, it returns the position and facial attributes such as age range, emotions, and gender.
    • Applications: Useful in situations like crowd monitoring, audience reactions during events, and security applications.
  3. GetLabelDetection
    • Purpose: Retrieves the results of the label detection operation once it’s complete.
    • How it Works: After you initiate label detection using StartLabelDetection, you can use this function to obtain the detected labels, their confidence scores, and their timings in the video.
    • Applications: Post-processing of video data, generating insights or reports based on video content, and refining content recommendation systems.
  4. GetFaceDetection
    • Purpose: Retrieves the results of the face detection operation once it’s done.
    • How it Works: After starting face detection with StartFaceDetection, this function allows you to get details of the detected faces, their attributes, and their timings in the video.
    • Applications: Analyzing audience engagement, monitoring restricted areas for unauthorized access, and in-depth video analytics.

3. Advanced Features

3.1. Custom Labels

With Amazon Rekognition Custom Labels, you can train your own machine learning model to detect specific items in images tailored to your needs.

  1. Create a dataset: You’ll need a labeled dataset.
  2. Train your model: Use the Rekognition console to train your model.
  3. Test & deploy: Once your model is trained, you can test and deploy it.

3.2. Face Collections

You can create collections of faces, which lets you search for faces in an image that match those in your collection. Useful functions include:

  1. CreateCollection
    • Purpose: Creates a new collection of faces.
    • How it Works: A collection is a container for storing face metadata. Once you create a collection, you can add face data to it.
    • Applications: Building a face database for facial recognition systems, creating a whitelist/blacklist of faces for security systems.
  2. IndexFaces
    • Purpose: Adds face data to the specified collection.
    • How it Works: This function detects faces in an input image and adds them to the specified collection. It returns face records for each face detected, which includes a face ID and a bounding box.
    • Applications: Populating a database for a facial recognition system, storing face data for repeat visitors or customers.
  3. SearchFaces
    • Purpose: Searches for matching faces in the specified collection.
    • How it Works: You provide a source face, and the function searches for faces in the collection that look similar. It returns a ranked list of faces with similarity scores.
    • Applications: Finding a person of interest in a database, verifying identity using facial data, and ensuring only authorized personnel access specific areas.

4. Best Practices & Tips

  1. Stay within limits: Rekognition has API rate limits. Familiarize yourself with them to avoid throttling.
  2. Optimize costs: Only request features you need. For instance, if you only need object labels, don’t request face detection.
  3. Handle failures: Always add error handling in your code to manage potential API failures.

5. Wrapping Up

Amazon Rekognition offers a powerful set of tools for developers interested in image and video analysis. Like any AWS service, the key is understanding how its different features fit together and mapping them to your specific needs. With hands-on experimentation and real-world applications, you’ll become proficient in no time. Happy coding!