Document areas detection

A scanned image or photograph of a text document may contain a large number of blocks of various content - text paragraphs, tables, illustrations, formulas, and the like. Detecting, ordering, and classifying areas of interest on a page is the cornerstone of successful and accurate OCR. This process is called document areas detection.

Aspose.OCR offers several document areas detection algorithms, allowing you to choose the one that works best for your specific content.

Area detection modes

You can manually override the default document areas detection method if you are unhappy with the results or get unwanted artifacts.

Document structure analysis algorithm is specified in an optional DetectAreasMode parameter of recognition settings.

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
// Add an image to OcrInput object
Aspose.OCR.OcrInput input = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
input.Add("source.png");
// Set document areas detection mode
Aspose.OCR.RecognitionSettings recognitionSettings = new Aspose.OCR.RecognitionSettings();
recognitionSettings.DetectAreasMode = Aspose.OCR.DetectAreasMode.DOCUMENT;
// Recognize image
List<Aspose.OCR.RecognitionResult> results = recognitionEngine.Recognize(input, recognitionSettings);
foreach(Aspose.OCR.RecognitionResult result in results)
{
	Console.WriteLine(result.RecognitionText);
}

Aspose.OCR for .NET supports the following document structure analysis methods provided in [DetectAreasMode] enumeration:

Name	Value	Description	Use cases
DetectAreasMode.NONE	0	Do not analyze document structure.	Simple images containing a few lines of text without illustrations or formatting. Applications requiring maximum recognition speed Web applications
DetectAreasMode.DOCUMENT	1	Detect large blocks of text, such as paragraphs and columns. Optimal for multi-column documents with illustrations. See DetectAreasMode.DOCUMENT for additional details.	Contracts Books Articles Newspapers High-quality scans
DetectAreasMode.PHOTO	2	Finds small text blocks inside complex images. See DetectAreasMode.PHOTO for additional details.	Driver’s licenses Social security cards Government and work IDs Visas Photos Screenshots Advertisements
DetectAreasMode.COMBINE	3	The combination of DetectAreasMode.DOCUMENT and DetectAreasMode.PHOTO. See DetectAreasMode.COMBINE for additional details.	Posters Billboards Datasheets Random photos Batch recognition
DetectAreasMode.TABLE	4	Detects cells in tabular structures. See DetectAreasMode.TABLE for additional details.	Tables Invoices
DetectAreasMode.CURVED_TEXT	5	Auto-straightens curved lines and finds text blocks inside the resulting image. See DetectAreasMode.CURVED_TEXT for additional details.	Photos of books, magazine articles, and other curved pages.