Saving recognition results as a searchable PDF

To convert recognition results into a searchable and indexable PDF document, use SaveMultipageDocument method of Aspose.OCR.AsposeOcr class. This can be useful for recognizing books, contracts, articles, and other printouts consisting of multiple pages, as well as for batch recognition. Provide Aspose.OCR.SaveFormat.Pdf as saveFormat parameter.

The resulting PDF will have original images in the background and a transparent text overlay that can be searched, selected and copied.

You can optionally enable automatic spelling corrections for recognition results and provide a custom dictionary.

Save PDF to file

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("page1.png");
input.Add("page2.png");
// Recognize image
List<Aspose.OCR.RecognitionResult> results = recognitionEngine.Recognize(input);
// Save results
Aspose.OCR.AsposeOcr.SaveMultipageDocument("result.pdf", Aspose.OCR.SaveFormat.Pdf, results);

Write PDF to memory

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("page1.png");
input.Add("page2.png");
// Recognize image
List<Aspose.OCR.RecognitionResult> results = recognitionEngine.Recognize(input);
// Save results
using(MemoryStream ms = new MemoryStream())
{
	Aspose.OCR.AsposeOcr.SaveMultipageDocument(ms, Aspose.OCR.SaveFormat.Pdf, results);
}