Working with OCR Pages

After starting the OCR engine, you can begin working with the document page(s). Pages can work with or without An OCR document.

The LEADTOOLS OCR methods provide support for the following when working with OCR pages:

As described in Programming with Leadtools .NET OCR, an IOcrPage page can be created directly using CreatePage without using an IOcrDocument object. These pages can be zoned and recognized and the OCR results can be obtained directly using GetText or GetRecognizedCharacters.

If the page are to be saved to a final document such as PDF or DOCX, then an IOcrDocument instance is required.

An instance of IOcrDocument contains the pages of a document. You can create a new OCR document using the IOcrDocumentManager.CreateDocument method. This method allows creation of memory-based or file-based documents.

Each OCR document can have one or more pages (IOcrPage objects). Each IOcrDocument contains an IOcrDocument.Pages property of type IOcrPageCollection that you can use to access the pages of a document.

IOcrDocument through the IOcrDocument.Pages property holds a collection of IOcrPage objects. Each of these IOcrPage objects contains the raster image used to create it (the image used when the page is loaded or added) and a group of OCR zones for the page either added manually or through auto-zoning.

The IOcrPageCollection interface implements standard .NET Collection{T}, IList{T}, and IEnumerable{T} interfaces and hence, you can use the member of these interfaces to add, remove, get, set and iterate through the different pages of the document if the document was memory-based.

For file-based document, adding a page to the document involves taking a snap shot of the current recognition data and store it internally. The page itself is not added to the collection and is not required to stay in memory. The collection is a read-only view on the document and the user can only add new pages and not remove or iterate through them

The following list contains the major functionality of the IOcrPageCollection interface:

Methods Description
IOcrPageCollection.Add Adds the recognition data of a IOcrPage to a document. File-based documents only.
IOcrPageCollection.AddPage Adds a single page from a RasterImage, DIB or an image file in disk file, .NET stream, remote URL. Memory-based documents only.
IOcrPageCollection.AddPages Adds multiple pages from a multi-page RasterImage or an image file in disk file, .NET stream or remote URL. Memory-based documents only.
IOcrPageCollection.InsertPage Inserts into a specific location a single page from a RasterImage, DIB or an image file in disk file, .NET stream, remote URL. Memory-based documents only.
IOcrPageCollection.InsertPages Inserts into a specific location multiple pages from a multi-page RasterImage or an image file in disk file, .NET stream or remote URL. Memory-based documents only.
Methods Description
IOcrPageCollection.ExportPage Saves a single page in the document to a RasterImage object, an image file in disk file or a .NET stream.
IOcrPageCollection.ExportPages Saves multiple pages in the document to a multi-page RasterImage object, an image file in disk file or a .NET stream.
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