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AVL.ExtractText Method
Ready-to-use tool for extracting and splitting character to single characters.
Namespace: | AvlNet |
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Assembly: | AVL.NET.dll |
Syntax
public static void ExtractText( AvlNet.Image inImage, AvlNet.Rectangle2D inRoi, AvlNet.CoordinateSystem2D inRoiAlignment, AvlNet.TextSegmentation inSegmentationModel, out AvlNet.Region[] outCharacters, out AvlNet.Region diagTextRegion, out AvlNet.Region[] diagAlignedCharacters, out AvlNet.Rectangle2D diagAlignedRoi )
Parameters
Name | Type | Range | Default | Description | |
---|---|---|---|---|---|
![]() | inImage | AvlNet.Image | An input image with text. | ||
![]() | inRoi | AvlNet.Rectangle2D | Location of the text. | ||
![]() | inRoiAlignment | AvlNet.CoordinateSystem2D | Adjusts the region of interest to the position of the inspected object. | ||
![]() | inSegmentationModel | AvlNet.TextSegmentation | Model used for separating text from background. | ||
![]() | outCharacters | AvlNet.Region | Split characters aligned to ROI. | ||
![]() | diagTextRegion | AvlNet.Region | Region of text after extraction. | ||
![]() | diagAlignedCharacters | AvlNet.Region | Character regions preserving original image orientation. | ||
![]() | diagAlignedRoi | AvlNet.Rectangle2D | ROI rectangle after alignment. |
Description
This filter distinguish characters from the background using a set of algorithms. This filter performs two steps: text extraction and text segmentation:
- Text extraction – in this step filter uses some basic thresholding methods to get a characters region from the image.
- Text segmentation – split previously found region into separate regions contains character.
Input inRoi should contains only a single line of text.
Remarks
To read more about how to use OCR technique, refer to Machine Vision Guide: Optical Character Recognition
Errors
Error type | Description |
---|---|
DomainError | Invalid thresholding algorithm in ExtractText. |
DomainError | Invalid splitting algorithm in ExtractText. |