Finding paragraph bounding boxes

Aspose.OCR for .NET can automatically find the coordinates of image regions containing text paragraphs. This can be useful for highlighting detected areas when previewing an image or extracting individual blocks of text.

To get bounding boxes of all paragraphs in images, provided in OcrInput object, use Aspose.OCR.AsposeOcr.DetectRectangles method. Specify Aspose.OCR.AreasType.PARAGRAPHS as the areasType parameter of the method. detectAreas parameter of the method is ignored.

The method returns a list of Aspose.OCR.RectangleOutput objects containing coordinates of each paragraph in each image.

PDF documents can contain more than one image per page. Therefore, the resulting list can contain more Aspose.OCR.RectangleOutput objects than the number of pages in the document.

Property	Type	Description
Rectangles	List<Rectangle>	Coordinates of each paragraph of an image (top-left corner, width and height), returned as a list of Rectangle objects.
ImageIndex	int	Sequence number of the image on the page. When working with single-page images, this value is always 0.
Page	int	Page number. When working with single-page images, this value is always 0.
Source	string	The full path or URL of the source file. If the file is provided as a MemoryStream object, an array of pixels, or a Base64 string, this value will be empty.

Example

The following code example shows how to detect paragraphs in multiple images:

Aspose.OCR.AsposeOcr recognitionEngine = new Aspose.OCR.AsposeOcr();
// Add images to OcrInput object
Aspose.OCR.OcrInput input = new Aspose.OCR.OcrInput(Aspose.OCR.InputType.SingleImage);
input.Add("source1.png");
input.Add("source2.jpg");
// Detect paragraphs
List<Aspose.OCR.RectangleOutput> results = recognitionEngine.DetectRectangles(input, Aspose.OCR.AreasType.PARAGRAPHS);
foreach(Aspose.OCR.RecognitionResult result in results)
{
	foreach(Rectangle region in result.Rectangles) Console.WriteLine($"File: {result.Source} | {region.Top}, {region.Left}, {region.Width}, {region.Height}");
}