A couple days ago I decided to get my act together regarding incoming mail (physical ones) and other documents so I scanned everything before throwing to big box with “Archive” label and… started to think about enabling search of the scanned documents.
Searching through documents is a topic for another post, here we’ll focus on getting text from images by means of Optical Character Recognition service from AWS – AWS Textract.
Preparation
AWS Textract processes documents from S3 bucket, so we need one before we can start our text extraction process, so let’s create one:
aws s3api create-bucket --bucket YOUR_BUCKET_NAME --create-bucket-configuration LocationConstraint=eu-west-1
aws s3api put-bucket-lifecycle-configuration --bucket YOUR_BUCKET_NAME --lifecycle-configuration '{
"Rules": [
{
"ID": "ExpireAfter1Day",
"Status": "Enabled",
"Prefix": "",
"Expiration": {
"Days": 1
}
}
]
}'
Here we create a bucket and then set lifecycle policy to automatically delete all objects after 1 day – this way we get rid of processed document in an automatic way.
Processing documents
Now it’s a time to process the document and get text. First we upload the file from local disk to S3, then we call AWS Textract detect-document-text action to get the results. As the result is quite long JSON, but we need just the text, we post-process the results using jq:
file=test.png
bucket=YOUR_BUCKET_NAME
aws s3 cp $file s3://$bucket/
aws textract detect-document-text --document "S3Object={Bucket=$bucket,Name=$file}" | jq -r '.Blocks[] | select(.BlockType == "LINE") | .Text'
The result will be the text extracted from the image file. You can save it to the file, DB or anywhere you find it useful for further processing 🙂
The nice thing about AWS Textract is that you don’t have to care about the format of the file, as AWS Textract can recognize text from both images as well as PDF files 🙂
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