tesseract::TessAltoRenderer Class Reference

#include <renderer.h>

Inheritance diagram for tesseract::TessAltoRenderer:

Public Member Functions
	TessAltoRenderer (const char *outputbase)
Public Member Functions inherited from tesseract::TessResultRenderer
virtual	~TessResultRenderer ()
void	insert (TessResultRenderer *next)
TessResultRenderer *	next ()
bool	BeginDocument (const char *title)
bool	AddImage (TessBaseAPI *api)
bool	EndDocument ()
const char *	file_extension () const
const char *	title () const
bool	happy () const
int	imagenum () const

Protected Member Functions
bool	BeginDocumentHandler () override
bool	AddImageHandler (TessBaseAPI *api) override
bool	EndDocumentHandler () override
Protected Member Functions inherited from tesseract::TessResultRenderer
	TessResultRenderer (const char *outputbase, const char *extension)
virtual bool	BeginDocumentHandler ()
virtual bool	AddImageHandler (TessBaseAPI *api)=0
virtual bool	EndDocumentHandler ()
void	AppendString (const char *s)
void	AppendData (const char *s, int len)

Detailed Description

Renders tesseract output into an alto text string

Definition at line 182 of file renderer.h.

Constructor & Destructor Documentation

TessAltoRenderer()

tesseract::TessAltoRenderer::TessAltoRenderer ( const char *  outputbase )

explicit

Definition at line 121 of file altorenderer.cpp.

    : TessResultRenderer(outputbase, "xml"),
      begin_document(false) {}

Member Function Documentation

AddImageHandler()

bool tesseract::TessAltoRenderer::AddImageHandler ( TessBaseAPI *  api )

overrideprotectedvirtual

Append the ALTO XML for the layout of the image

Implements tesseract::TessResultRenderer.

Definition at line 68 of file altorenderer.cpp.

                                                       {
  if (begin_document) {
    AppendString(
      "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
      "<alto xmlns=\"http://www.loc.gov/standards/alto/ns-v3#\" "
      "xmlns:xlink=\"http://www.w3.org/1999/xlink\" "
      "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "
      "xsi:schemaLocation=\"http://www.loc.gov/standards/alto/ns-v3# "
      "http://www.loc.gov/alto/v3/alto-3-0.xsd\">\n"
      "\t<Description>\n"
      "\t\t<MeasurementUnit>pixel</MeasurementUnit>\n"
      "\t\t<sourceImageInformation>\n"
      "\t\t\t<fileName>");
 
    AppendString(api->GetInputName());
 
    AppendString(
      "</fileName>\n"
      "\t\t</sourceImageInformation>\n"
      "\t\t<OCRProcessing ID=\"OCR_0\">\n"
      "\t\t\t<ocrProcessingStep>\n"
      "\t\t\t\t<processingSoftware>\n"
      "\t\t\t\t\t<softwareName>tesseract ");
    AppendString(TessBaseAPI::Version());
    AppendString(
      "</softwareName>\n"
      "\t\t\t\t</processingSoftware>\n"
      "\t\t\t</ocrProcessingStep>\n"
      "\t\t</OCRProcessing>\n"
      "\t</Description>\n"
      "\t<Layout>\n");
    begin_document = false;
  }
 
  const std::unique_ptr<const char[]> text(api->GetAltoText(imagenum()));
  if (text == nullptr) {
    return false;
  }
 
  AppendString(text.get());
 
  return true;
}

BeginDocumentHandler()

bool tesseract::TessAltoRenderer::BeginDocumentHandler ( )

overrideprotectedvirtual

Append the ALTO XML for the beginning of the document

Reimplemented from tesseract::TessResultRenderer.

Definition at line 59 of file altorenderer.cpp.

                                            {
  // Delay the XML output because we need the name of the image file.
  begin_document = true;
  return true;
}

EndDocumentHandler()

bool tesseract::TessAltoRenderer::EndDocumentHandler ( )

overrideprotectedvirtual

Append the ALTO XML for the end of the document

Reimplemented from tesseract::TessResultRenderer.

Definition at line 115 of file altorenderer.cpp.

                                          {
  AppendString("\t</Layout>\n</alto>\n");
 
  return true;
}

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The documentation for this class was generated from the following files:

• /media/home/debian/src/github/tesseract-ocr/tesseract/include/tesseract/renderer.h
• /media/home/debian/src/github/tesseract-ocr/tesseract/src/api/altorenderer.cpp