Amazon Textract
Developer Guide

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Block

A Block represents items that are recognized in a document within a group of pixels close to each other. The information returned in a Block object depends on the type of operation. In text detection for documents (for example DetectDocumentText), you get information about the detected words and lines of text. In text analysis (for example AnalyzeDocument), you can also get information about the fields, tables, and selection elements that are detected in the document.

An array of Block objects is returned by both synchronous and asynchronous operations. In synchronous operations, such as DetectDocumentText, the array of Block objects is the entire set of results. In asynchronous operations, such as GetDocumentAnalysis, the array is returned over one or more responses.

For more information, see How Amazon Textract Works.

Contents

BlockType

The type of text item that's recognized. In operations for text detection, the following types are returned:

  • PAGE - Contains a list of the LINE Block objects that are detected on a document page.

  • WORD - A word detected on a document page. A word is one or more ISO basic Latin script characters that aren't separated by spaces.

  • LINE - A string of tab-delimited, contiguous words that are detected on a document page.

In text analysis operations, the following types are returned:

  • PAGE - Contains a list of child Block objects that are detected on a document page.

  • KEY_VALUE_SET - Stores the KEY and VALUE Block objects for linked text that's detected on a document page. Use the EntityType field to determine if a KEY_VALUE_SET object is a KEY Block object or a VALUE Block object.

  • WORD - A word that's detected on a document page. A word is one or more ISO basic Latin script characters that aren't separated by spaces.

  • LINE - A string of tab-delimited, contiguous words that are detected on a document page.

  • TABLE - A table that's detected on a document page. A table is grid-based information with two or more rows or columns, with a cell span of one row and one column each.

  • CELL - A cell within a detected table. The cell is the parent of the block that contains the text in the cell.

  • SELECTION_ELEMENT - A selection element such as an option button (radio button) or a check box that's detected on a document page. Use the value of SelectionStatus to determine the status of the selection element.

Type: String

Valid Values: KEY_VALUE_SET | PAGE | LINE | WORD | TABLE | CELL | SELECTION_ELEMENT

Required: No

ColumnIndex

The column in which a table cell appears. The first column position is 1. ColumnIndex isn't returned by DetectDocumentText and GetDocumentTextDetection.

Type: Integer

Valid Range: Minimum value of 0.

Required: No

ColumnSpan

The number of columns that a table cell spans. Currently this value is always 1, even if the number of columns spanned is greater than 1. ColumnSpan isn't returned by DetectDocumentText and GetDocumentTextDetection.

Type: Integer

Valid Range: Minimum value of 0.

Required: No

Confidence

The confidence score that Amazon Textract has in the accuracy of the recognized text and the accuracy of the geometry points around the recognized text.

Type: Float

Valid Range: Minimum value of 0. Maximum value of 100.

Required: No

EntityTypes

The type of entity. The following can be returned:

  • KEY - An identifier for a field on the document.

  • VALUE - The field text.

EntityTypes isn't returned by DetectDocumentText and GetDocumentTextDetection.

Type: Array of strings

Valid Values: KEY | VALUE

Required: No

Geometry

The location of the recognized text on the image. It includes an axis-aligned, coarse bounding box that surrounds the text, and a finer-grain polygon for more accurate spatial information.

Type: Geometry object

Required: No

Id

The identifier for the recognized text. The identifier is only unique for a single operation.

Type: String

Pattern: .*\S.*

Required: No

Page

The page on which a block was detected. Page is returned by asynchronous operations. Page values greater than 1 are only returned for multipage documents that are in PDF format. A scanned image (JPEG/PNG), even if it contains multiple document pages, is considered to be a single-page document. The value of Page is always 1. Synchronous operations don't return Page because every input document is considered to be a single-page document.

Type: Integer

Valid Range: Minimum value of 0.

Required: No

Relationships

A list of child blocks of the current block. For example, a LINE object has child blocks for each WORD block that's part of the line of text. There aren't Relationship objects in the list for relationships that don't exist, such as when the current block has no child blocks. The list size can be the following:

  • 0 - The block has no child blocks.

  • 1 - The block has child blocks.

Type: Array of Relationship objects

Required: No

RowIndex

The row in which a table cell is located. The first row position is 1. RowIndex isn't returned by DetectDocumentText and GetDocumentTextDetection.

Type: Integer

Valid Range: Minimum value of 0.

Required: No

RowSpan

The number of rows that a table cell spans. Currently this value is always 1, even if the number of rows spanned is greater than 1. RowSpan isn't returned by DetectDocumentText and GetDocumentTextDetection.

Type: Integer

Valid Range: Minimum value of 0.

Required: No

SelectionStatus

The selection status of a selection element, such as an option button or check box.

Type: String

Valid Values: SELECTED | NOT_SELECTED

Required: No

Text

The word or line of text that's recognized by Amazon Textract.

Type: String

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following:

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