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 using setDetectAreasMode method of recognition settings.

// Create instance of OCR API
AsposeOCR api = new AsposeOCR();
// Enable automatic document areas detection
RecognitionSettings recognitionSettings = new RecognitionSettings();
recognitionSettings.setDetectAreasMode(DetectAreasMode.DOCUMENT);
// Prepare batch
OcrInput images = new OcrInput(InputType.SingleImage);
images.add("image.png");
// Recognize images
ArrayList<RecognitionResult> results = api.Recognize(images, recognitionSettings);
System.out.println("Recognition result:\n" + results[0].recognitionText + "\n\n");

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

Name	Value	Description	Use cases
DetectAreasMode.NONE	0	Do not analyze document structure. Similar to calling setDetectAreas(false) method of recognition settings.	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.
DetectAreasMode.TEXT_IN_WILD	6	Finds individual words on images with sparse text and colored backgrounds. See DetectAreasMode.TEXT_IN_WILD for additional details.	Street photos Price tags Food labels Menus Catalogs Ads