IBaseOCRExtractor Interface
Free Trial Web API version Licensing Request A Quote
HAVE QUESTIONS OR NEED HELP?SUBMIT THE SUPPORT REQUEST FORM or write email toSUPPORT@BYTESCOUT.COM
Defines a base interface for PDF text extractors.
Namespace:Bytescout.PDFExtractorAssembly: Bytescout.PDFExtractor (in Bytescout.PDFExtractor.dll) Version: 13.4.0.4760-master
Syntax
The IBaseOCRExtractor type exposes the following members.
Properties
| Name | Description | |
|---|---|---|
 | OCRAutoModeMinExistingTextLength | Applies to OCRMode.Auto only. Sets the minimal total length of normal text objects on the current page to decide whether to perform OCR or not. If the length of the text is less than this value then extractor will use OCR for this page. Otherwise it extracts the existing normal text objects only. |
| OCRBlackList | A set of characters not allowed to be recognized from scanned document. The resulting text will only contain characters that are not in this list. This helps improve uncertain recognition. |
| OCRCacheMode | Sets caching of OCR results. Default is Off (no caching). In WholePage caching mode you can save processing time as the SDK will check if need to re-run OCR on the page or it can just pull results from previously cached OCR results. |
| OCRCorrections | A set of corrections automatically applied to recognized text to fix repeating recognition errors. |
| OCRDetectLines | Sets whether to detect horizontal and vertical lines during OCR. They help to detect the table structure in scanned documents. Default is false. |
| OCRDetectPageRotation | Sets whether to detect scanned page rotation. Slightly slows down the processing. |
| OCRDisableAutoSegmentation | Sets whether to disable the automatic segmentation. All pages will be treated as containing sparse text (as a typical document such as an invoice). |
| OCRImagePreprocessingFilters | A set of corrections automatically applied to recognized text to fix repeating recognition errors. |
| OCRLanguage | Language of OCR (Optical Character Recognition). The valid values are:
Download more languages at https://github.com/bytescout/ocrdata. |
| OCRLanguageDataFolder | Folder containing OCR language data files. |
| OCRMaximizeCPUUtilization | Gets or sets maximum OCR performance using Intel OpenMP (if available) to accelerate to approximately 30%. Default is false. |
| OCRMode | Enables use of the OCR (Optical Character Recognition) which allows you to recognize text from images embedded in PDF pages. Set the language using the OCRLanguage property. This option requires Bytescout.PDFExtractor.OCRExtension.dll assembly reference and relevant language files in OCRLanguageDataFolder folder. The SDK is shipped with language files for English, French, German and Spanish. You can download more languages at https://github.com/bytescout/ocrdata. |
| OCROverallConfidence | Gets overall OCR confidence. This value is calculated after the extraction is performed. |
| OCRPageCount | Gets count of processed pages for which OCR was performed. This value is calculated after the extraction is finished. |
| OCRResolution | Resolution of OCR (Optical Character Recognition). Default is 300 DPI. |
| OCRWhiteList | A set of characters allowed to be recognized from scanned document. Only characters from this list will appear in the result text. This helps improve uncertain recognition. |
Methods
| Name | Description | |
|---|---|---|
 | IsOCRRecommendedForPage | Detects whether OCR is recommended for specified page. OCR (Optical Character Recognition) is recommended when pages has no text objects bat has an image that might contain text. |
See Also