Extract key-value pairs from docs w/ Amazon Textract

Programming
1

I am using the AmazonTextract .NET SDK to extract texts from images. I need to extract key-value pairs from the extracted texts.

My understanding is that I need to iterate through the list of blocks and check for KEY_VALUE_SET.

Can someone provide me with a piece of code that will give me key-value pairs after text extraction?

My sample code:

    var DocRequest = new AnalyzeDocumentRequest()
    {
       Document = MyDocument,
       FeatureTypes = new List<string> { Amazon.Textract.FeatureType.FORMS, Amazon.Textract.FeatureType.TABLES }
    };
    var response = client.AnalyzeDocumentAsync(DocRequest);
2

Here is a sample code that iterates through the blocks and extracts key-value pairs:

var DocRequest = new AnalyzeDocumentRequest()
{
   Document = MyDocument,
   FeatureTypes = new List<string> { Amazon.Textract.FeatureType.FORMS, Amazon.Textract.FeatureType.TABLES }
};
var response = await client.AnalyzeDocumentAsync(DocRequest);

foreach (var item in response.Blocks)
{
    if (item.BlockType == BlockType.KEY_VALUE_SET)
    {
        var keyValuePair = new KeyValuePair();

        foreach (var relationship in item.Relationships)
        {
            if (relationship.Type == RelationshipType.CHILD)
            {
                foreach (var childId in relationship.Ids)
                {
                    var childBlock = response.Blocks.FirstOrDefault(x => x.Id == childId);

                    if (childBlock.BlockType == BlockType.KEY)
                    {
                        keyValuePair.Key = childBlock.Text;
                    }
                    else if (childBlock.BlockType == BlockType.VALUE)
                    {
                        keyValuePair.Value = childBlock.Text;
                    }
                }
            }
        }

        // Do something with the keyValuePair
    }
}

Note that you need to add the following using statements at the top of your file:

using Amazon.Textract.Model;
using System.Collections.Generic;
using System.Linq;