AWS Documentation » Amazon Rekognition » Developer Guide » Searching Faces in a Collection » Describing a Collection

Describing a Collection

You can use the DescribeCollection operation to get the following information about a collection:

• The number of faces that are indexed into the collection.

• The version of the model that's used by the collection for face detection. For more information, see Model Versioning.

• The Amazon Resource Name (ARN) of the collection.

• The creation date and time of the collection.

To describe a collection (SDK)

1. If you haven't already:

   1. Create or update an IAM user with AmazonRekognitionFullAccess permissions. For more information, see Step 1: Set Up an AWS Account and Create an IAM User.

   2. Install and configure the AWS CLI and the AWS SDKs. For more information, see Step 2: Set Up the AWS CLI and AWS SDKs.

2. Use the following examples to call the DescribeCollection operation.

   JavaAWS CLIPython.NET

   Java

   This example describes a collection.

   Change the value collectionId to the ID of the desired collection.

   //Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
   //PDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-rekognition-developer-guide/blob/master/LICENSE-SAMPLECODE.)
   
   package com.amazonaws.samples;
   
   import com.amazonaws.services.rekognition.AmazonRekognition;
   import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder;
   import com.amazonaws.services.rekognition.model.DescribeCollectionRequest;
   import com.amazonaws.services.rekognition.model.DescribeCollectionResult;
   
   
   public class DescribeCollection {
   
      public static void main(String[] args) throws Exception {
   
         String collectionId = "CollectionID";
         
         AmazonRekognition rekognitionClient = AmazonRekognitionClientBuilder.defaultClient();
   
               
         System.out.println("Describing collection: " +
            collectionId );
            
               
           DescribeCollectionRequest request = new DescribeCollectionRequest()
                       .withCollectionId(collectionId);
              
         DescribeCollectionResult describeCollectionResult = rekognitionClient.describeCollection(request); 
         System.out.println("Collection Arn : " +
            describeCollectionResult.getCollectionARN());
         System.out.println("Face count : " +
            describeCollectionResult.getFaceCount().toString());
         System.out.println("Face model version : " +
            describeCollectionResult.getFaceModelVersion());
         System.out.println("Created : " +
            describeCollectionResult.getCreationTimestamp().toString());
   
      } 
   
   }
       
   
   

   AWS CLI

   This AWS CLI command displays the JSON output for the describe-collection CLI operation. Change the value of collection-id to the ID of the desired collection.

   aws rekognition describe-collection --collection-id collectionname 
                              

   Python

   This example describes a collection.

   Change the value collectionId to the ID of the desired collection.

   #Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
   #PDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-rekognition-developer-guide/blob/master/LICENSE-SAMPLECODE.)
   
   import boto3
   from botocore.exceptions import ClientError
   
   if __name__ == "__main__":
   
       collectionId='MyCollection'
       print('Attempting to describe collection ' + collectionId)
       client=boto3.client('rekognition')
   
       try:
           response=client.describe_collection(CollectionId=collectionId)
           print("Collection Arn: "  + response['CollectionARN'])
           print("Face Count: "  + str(response['FaceCount']))
           print("Face Model Version: "  + response['FaceModelVersion'])
           print("Timestamp: "  + str(response['CreationTimestamp']))
   
           
       except ClientError as e:
           if e.response['Error']['Code'] == 'ResourceNotFoundException':
               print ('The collection ' + collectionId + ' was not found ')
           else:
               print ('Error other than Not Found occurred: ' + e.response['Error']['Message'])
       print('Done...')
   
   
   
   
   
   

   .NET

   This example describes a collection.

   Change the value collectionId to the ID of the desired collection.

   //Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
   //PDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-rekognition-developer-guide/blob/master/LICENSE-SAMPLECODE.)
   
   using System;
   using Amazon.Rekognition;
   using Amazon.Rekognition.Model;
   
   public class DescribeCollection
   {
       public static void Example()
       {
           AmazonRekognitionClient rekognitionClient = new AmazonRekognitionClient();
   
           String collectionId = "CollectionID";
           Console.WriteLine("Describing collection: " + collectionId);
   
           DescribeCollectionRequest describeCollectionRequest = new DescribeCollectionRequest()
           {
               CollectionId = collectionId
           };
   
           DescribeCollectionResponse describeCollectionResponse = rekognitionClient.DescribeCollection(describeCollectionRequest);
           Console.WriteLine("Collection ARN: " + describeCollectionResponse.CollectionARN);
           Console.WriteLine("Face count: " + describeCollectionResponse.FaceCount);
           Console.WriteLine("Face model version: " + describeCollectionResponse.FaceModelVersion);
           Console.WriteLine("Created: " + describeCollectionResponse.CreationTimestamp);
       }
   }
   

DescribeCollection Operation Request

The input to DescribeCollection is the ID of the desired collection, as shown in the following JSON example.

{
    "CollectionId": "MyCollection"
}

DescribeCollection Operation Response

The response includes:

• The number of faces that are indexed into the collection, FaceCount.

• The version of the face model that's used to detect faces, FaceModelVersion.

• The collection Amazon Resource Name, CollectionARN.

• The creation time and date of the collection, CreationTimestamp. The value of CreationTimestamp is the number of milliseconds since the Unix epoch time until the creation of the collection. The Unix epoch time is 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970. For more information, see Unix Time.

{
    "CollectionARN": "arn:aws:rekognition:us-east-1:nnnnnnnnnnnn:collection/MyCollection",
    "CreationTimestamp": 1.533422155042E9,
    "FaceCount": 200,
    "FaceModelVersion": "1.0"
}