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# 从集合中删除人脸
您可以使用 [DeleteFaces](https://docs.aws.amazon.com/rekognition/latest/APIReference/API_DeleteFaces.html) 操作从集合中删除人脸。有关更多信息，请参阅 [管理集合中的人脸](managing-face-collections.md#collections-index-faces)。
**从集合中删除人脸**
1. 如果您尚未执行以下操作，请：
1. 使用 `AmazonRekognitionFullAccess` 权限创建或更新用户。有关更多信息，请参阅 [步骤 1：设置 AWS 账户并创建用户](setting-up.md#setting-up-iam)。
1. 安装并配置 AWS CLI 和 AWS SDKs。有关更多信息，请参阅 [第 2 步：设置 AWS CLI 和 AWS SDKs](setup-awscli-sdk.md)。
1. 使用以下示例调用 `DeleteFaces` 操作。
------
#### [ Java ]
此示例从集合中删除单个人脸。
将 `collectionId` 的值更改为包含您要删除的人脸的集合。将 `faces` 的值更改为您要删除的人脸的 ID。要删除多张脸，请将该人脸 IDs 添加到`faces`数组中。
```
//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 aws.example.rekognition.image;
import com.amazonaws.services.rekognition.AmazonRekognition;
import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder;
import com.amazonaws.services.rekognition.model.DeleteFacesRequest;
import com.amazonaws.services.rekognition.model.DeleteFacesResult;
import java.util.List;
public class DeleteFacesFromCollection {
public static final String collectionId = "MyCollection";
public static final String faces[] = {"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"};
public static void main(String[] args) throws Exception {
AmazonRekognition rekognitionClient = AmazonRekognitionClientBuilder.defaultClient();
DeleteFacesRequest deleteFacesRequest = new DeleteFacesRequest()
.withCollectionId(collectionId)
.withFaceIds(faces);
DeleteFacesResult deleteFacesResult=rekognitionClient.deleteFaces(deleteFacesRequest);
List < String > faceRecords = deleteFacesResult.getDeletedFaces();
System.out.println(Integer.toString(faceRecords.size()) + " face(s) deleted:");
for (String face: faceRecords) {
System.out.println("FaceID: " + face);
}
}
}
```
------
#### [ Java V2 ]
此代码取自 AWS 文档 SDK 示例 GitHub 存储库。请在[此处](https://github.com/awsdocs/aws-doc-sdk-examples/blob/master/javav2/example_code/rekognition/src/main/java/com/example/rekognition/DeleteFacesFromCollection.java)查看完整示例。
```
import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.rekognition.RekognitionClient;
import software.amazon.awssdk.services.rekognition.model.DeleteFacesRequest;
import software.amazon.awssdk.services.rekognition.model.RekognitionException;
// snippet-end:[rekognition.java2.delete_faces_collection.import]
/**
* Before running this Java V2 code example, set up your development environment, including your credentials.
*
* For more information, see the following documentation topic:
*
* https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
*/
public class DeleteFacesFromCollection {
public static void main(String[] args) {
final String usage = "\n" +
"Usage: " +
" \n\n" +
"Where:\n" +
" collectionId - The id of the collection from which faces are deleted. \n\n" +
" faceId - The id of the face to delete. \n\n";
if (args.length != 1) {
System.out.println(usage);
System.exit(1);
}
String collectionId = args[0];
String faceId = args[1];
Region region = Region.US_EAST_1;
RekognitionClient rekClient = RekognitionClient.builder()
.region(region)
.credentialsProvider(ProfileCredentialsProvider.create("profile-name"))
.build();
System.out.println("Deleting collection: " + collectionId);
deleteFacesCollection(rekClient, collectionId, faceId);
rekClient.close();
}
// snippet-start:[rekognition.java2.delete_faces_collection.main]
public static void deleteFacesCollection(RekognitionClient rekClient,
String collectionId,
String faceId) {
try {
DeleteFacesRequest deleteFacesRequest = DeleteFacesRequest.builder()
.collectionId(collectionId)
.faceIds(faceId)
.build();
rekClient.deleteFaces(deleteFacesRequest);
System.out.println("The face was deleted from the collection.");
} catch(RekognitionException e) {
System.out.println(e.getMessage());
System.exit(1);
}
}
// snippet-end:[rekognition.java2.delete_faces_collection.main]
}
```
------
#### [ AWS CLI ]
此 AWS CLI 命令显示 `delete-faces` CLI 操作的 JSON 输出。将 `collection-id` 的值替换为您要删除的人脸所在集合的名称。将的`face-ids`值替换为要删除 IDs 的人脸数组。将创建 Rekognition 会话的行中的`profile_name`值替换为您的开发人员资料的名称。
```
aws rekognition delete-faces --collection-id "collection-id" --face-ids "faceid" --profile profile-name
```
------
#### [ Python ]
此示例从集合中删除单个人脸。
将 `collectionId` 的值更改为包含您要删除的人脸的集合。将 `faces` 的值更改为您要删除的人脸的 ID。要删除多张脸，请将该人脸 IDs 添加到`faces`数组中。将创建 Rekognition 会话的行中的`profile_name`值替换为您的开发人员资料的名称。
```
# 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
def delete_faces_from_collection(collection_id, faces):
session = boto3.Session(profile_name='profile-name')
client = session.client('rekognition')
response = client.delete_faces(CollectionId=collection_id,
FaceIds=faces)
print(str(len(response['DeletedFaces'])) + ' faces deleted:')
for faceId in response['DeletedFaces']:
print(faceId)
return len(response['DeletedFaces'])
def main():
collection_id = 'collection-id'
faces = []
faces.append("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")
faces_count = delete_faces_from_collection(collection_id, faces)
print("deleted faces count: " + str(faces_count))
if __name__ == "__main__":
main()
```
------
#### [ .NET ]
此示例从集合中删除单个人脸。
将 `collectionId` 的值更改为包含您要删除的人脸的集合。将 `faces` 的值更改为您要删除的人脸的 ID。要删除多张面孔，请将该人脸 IDs 添加到`faces`列表中。
```
//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 System.Collections.Generic;
using Amazon.Rekognition;
using Amazon.Rekognition.Model;
public class DeleteFaces
{
public static void Example()
{
String collectionId = "MyCollection";
List faces = new List() { "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" };
AmazonRekognitionClient rekognitionClient = new AmazonRekognitionClient();
DeleteFacesRequest deleteFacesRequest = new DeleteFacesRequest()
{
CollectionId = collectionId,
FaceIds = faces
};
DeleteFacesResponse deleteFacesResponse = rekognitionClient.DeleteFaces(deleteFacesRequest);
foreach (String face in deleteFacesResponse.DeletedFaces)
Console.WriteLine("FaceID: " + face);
}
}
```
------
## DeleteFaces 操作请求
的输入`DeleteFaces`是包含面孔的集合的 ID，以及要删除的人脸 IDs 的数组。
```
{
"CollectionId": "MyCollection",
"FaceIds": [
"daf29cac-f910-41e9-851f-6eeb0e08f973"
]
}
```
## DeleteFaces 操作响应
`DeleteFaces`响应包含已删除人脸 IDs 的面孔数组。
```
{
"DeletedFaces": [
"daf29cac-f910-41e9-851f-6eeb0e08f973"
]
}
```
如果输入中 IDs 提供的面孔当前与用户关联，则将以正当理由将其作为其中的 UnsuccessfulFaceDeletions 一部分返回。
```
{
"DeletedFaces": [
"daf29cac-f910-41e9-851f-6eeb0e08f973"
],
"UnsuccessfulFaceDeletions" : [
{
"FaceId" : "0b683aed-a0f1-48b2-9b5e-139e9cc2a757",
"UserId" : "demoUser1",
"Reason" : ["ASSOCIATED_TO_AN_EXISTING_USER"]
}
]
}
```