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Analyzing images with Amazon Rekognition

Amazon Rekognition makes it easy to add image analysis to your applications. Use this information to review the prerequisites and to set up the service.

This service can identify the following in images:
  • objects (e.g. flower, tree, or table)
  • events (e.g. a wedding, graduation, or birthday party)
  • concepts (e.g. a landscape, evening, and nature)

Prerequisites

The general prerequisites to use Amazon Rekognition are documented in Getting Started with Amazon Rekognition. The configuration is simpler that Amazon Comprehend as you don't need to use asynchronous operations.

Supported regions

See the list of supported AWS regions where Amazon Rekognition is available.

Limits

There are a number of limits that relate to Amazon Rekognition:
  • Amazon Rekognition supports the PNG and JPEG image formats. So the images provided as input to various API operations, such as DetectLabels, must be in one of the supported formats.
  • Images up to 5 MB are passed directly as raw bytes. Images over 5 MB go via an S3 bucket setup for Intelligence Services and Rekognition. The maximum image size allowed by Rekognition is limited to 15 MB.
  • The minimum image size is 80 pixels for both height and width.

See the AWS site for more details: Limits in Amazon Rekognition, Amazon Rekognition Limits.

Configuration

You'll need to create an AWS Identity and Access Management (IAM) role with the correct permissions to control access to AWS services and resources.

There is a setting for the level of confidence that Amazon Rekognition has in the accuracy of the extracted content. This is defined as the minimum confidence level and has a default value of 80%.

See Setting up services in AWS for more.

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