AWS Amplify distributes the ReadForMe web app, consisting of HTML, JavaScript, and CSS, to end users’ mobile devices. TheAmazon Cognito identity pool grants temporary access to the Amazon S3bucket. The user uploads an image file to the Amazon S3 bucket using AWS SDK through the web app. The ReadForMe web app invokes the backend AI services by sending theAmazon S3 object key in the payload to Amazon API Gateway. API Gateway instantiates an AWS Step Functions workflow. The state machine orchestrates the Artificial Intelligence /Machine Learning (AI/ML) services Amazon Textract, Amazon Comprehend, AmazonTranslate, and Amazon Polly, using AWS Lambdafunctions. The AWS Step Functions workflow creates an audio file as output and stores it in Amazon S3 in MP3 format. A pre-signed URL with the location of the audio file stored in AmazonS3 is sent back to the user’s browser through API Gateway. The user’s mobile device plays the audio file using the pre-signed URL.
