使用Python中的Rekognition对多个图像进行多处理

时间:2018-06-13 05:31:37

标签: python amazon-web-services boto3 python-multiprocessing amazon-rekognition

我正在尝试使用Python中的AWS Rekognition检测多个图像的标签。 此过程大约需要3秒钟才能对图像进行标记。有什么方法可以并行标记这些图像吗?

由于我限制使用boto3会话,请尽可能提供代码段。

1 个答案:

答案 0 :(得分:0)

您可以做的最好的事情是,不是在本地计算机上运行代码,而是在云中作为函数运行它。使用AWS Lambda,您可以轻松完成此操作。只需添加s3对象上传作为你的lambda的触发器,每当任何图像上传到你的s3桶时,它将触发你的lambda函数,它将 detect_labels ,然后你可以像你那样使用这些标签想要,你甚至可以将它们存储到一个dynamodb表中供以后参考并从该表中获取。

最好的事情是,如果您同时上传多个图像,那么每个图像将被并行执行,因为lambda具有高度可扩展性,您可以同时获得所有结果。

相同的示例代码:

from __future__ import print_function

import boto3
from decimal import Decimal
import json
import urllib

print('Loading function')

rekognition = boto3.client('rekognition')


# --------------- Helper Functions to call Rekognition APIs ------------------





def detect_labels(bucket, key):
    response = rekognition.detect_labels(Image={"S3Object": {"Bucket": bucket, "Name": key}})

    # Sample code to write response to DynamoDB table 'MyTable' with 'PK' as Primary Key.
    # Note: role used for executing this Lambda function should have write access to the table.
    #table = boto3.resource('dynamodb').Table('MyTable')
    #labels = [{'Confidence': Decimal(str(label_prediction['Confidence'])), 'Name': label_prediction['Name']} for label_prediction in response['Labels']]
    #table.put_item(Item={'PK': key, 'Labels': labels})
    return response



# --------------- Main handler ------------------


def lambda_handler(event, context):

    # Get the object from the event
    bucket = event['Records'][0]['s3']['bucket']['name']
    key = urllib.unquote_plus(event['Records'][0]['s3']['object']['key'].encode('utf8'))
    try:
        #Calls rekognition DetectLabels API to detect labels in S3 object
        response = detect_labels(bucket, key)
        print(response)

        return response
    except Exception as e:
        print(e)
        print("Error processing object {} from bucket {}. ".format(key, bucket) +
              "Make sure your object and bucket exist and your bucket is in the same region as this function.")
        raise e