Tesseract  3.02
tesseract::TessBaseAPI Class Reference

#include <baseapi.h>

List of all members.

Public Member Functions

 TessBaseAPI ()
virtual ~TessBaseAPI ()
void SetInputName (const char *name)
void SetOutputName (const char *name)
bool SetVariable (const char *name, const char *value)
bool SetDebugVariable (const char *name, const char *value)
bool GetIntVariable (const char *name, int *value) const
bool GetBoolVariable (const char *name, bool *value) const
bool GetDoubleVariable (const char *name, double *value) const
const char * GetStringVariable (const char *name) const
void PrintVariables (FILE *fp) const
bool GetVariableAsString (const char *name, STRING *val)
int Init (const char *datapath, const char *language, OcrEngineMode mode, char **configs, int configs_size, const GenericVector< STRING > *vars_vec, const GenericVector< STRING > *vars_values, bool set_only_non_debug_params)
int Init (const char *datapath, const char *language, OcrEngineMode oem)
int Init (const char *datapath, const char *language)
const char * GetInitLanguagesAsString () const
void GetLoadedLanguagesAsVector (GenericVector< STRING > *langs) const
int InitLangMod (const char *datapath, const char *language)
void InitForAnalysePage ()
void ReadConfigFile (const char *filename)
void ReadDebugConfigFile (const char *filename)
void SetPageSegMode (PageSegMode mode)
PageSegMode GetPageSegMode () const
char * TesseractRect (const unsigned char *imagedata, int bytes_per_pixel, int bytes_per_line, int left, int top, int width, int height)
void ClearAdaptiveClassifier ()
void SetImage (const unsigned char *imagedata, int width, int height, int bytes_per_pixel, int bytes_per_line)
void SetImage (const Pix *pix)
void SetSourceResolution (int ppi)
void SetRectangle (int left, int top, int width, int height)
void SetThresholder (ImageThresholder *thresholder)
Pix * GetThresholdedImage ()
Boxa * GetRegions (Pixa **pixa)
Boxa * GetTextlines (Pixa **pixa, int **blockids)
Boxa * GetStrips (Pixa **pixa, int **blockids)
Boxa * GetWords (Pixa **pixa)
Boxa * GetConnectedComponents (Pixa **cc)
Boxa * GetComponentImages (PageIteratorLevel level, bool text_only, Pixa **pixa, int **blockids)
int GetThresholdedImageScaleFactor () const
void DumpPGM (const char *filename)
PageIteratorAnalyseLayout ()
int Recognize (ETEXT_DESC *monitor)
int RecognizeForChopTest (ETEXT_DESC *monitor)
bool ProcessPages (const char *filename, const char *retry_config, int timeout_millisec, STRING *text_out)
bool ProcessPage (Pix *pix, int page_index, const char *filename, const char *retry_config, int timeout_millisec, STRING *text_out)
ResultIteratorGetIterator ()
MutableIteratorGetMutableIterator ()
char * GetUTF8Text ()
char * GetHOCRText (int page_number)
char * GetBoxText (int page_number)
char * GetUNLVText ()
int MeanTextConf ()
int * AllWordConfidences ()
bool AdaptToWordStr (PageSegMode mode, const char *wordstr)
void Clear ()
void End ()
int IsValidWord (const char *word)
bool GetTextDirection (int *out_offset, float *out_slope)
void SetDictFunc (DictFunc f)
void SetProbabilityInContextFunc (ProbabilityInContextFunc f)
void SetFillLatticeFunc (FillLatticeFunc f)
bool DetectOS (OSResults *)
void GetFeaturesForBlob (TBLOB *blob, const DENORM &denorm, INT_FEATURE_ARRAY int_features, int *num_features, int *FeatureOutlineIndex)
void RunAdaptiveClassifier (TBLOB *blob, const DENORM &denorm, int num_max_matches, int *unichar_ids, float *ratings, int *num_matches_returned)
const char * GetUnichar (int unichar_id)
const DawgGetDawg (int i) const
int NumDawgs () const
Tesseract *const tesseract () const
OcrEngineMode const oem () const
void InitTruthCallback (TruthCallback *cb)
CubeRecoContextGetCubeRecoContext () const
void set_min_orientation_margin (double margin)
void GetBlockTextOrientations (int **block_orientation, bool **vertical_writing)
BLOCK_LIST * FindLinesCreateBlockList ()

Static Public Member Functions

static const char * Version ()
static ROWFindRowForBox (BLOCK_LIST *blocks, int left, int top, int right, int bottom)
static ROWMakeTessOCRRow (float baseline, float xheight, float descender, float ascender)
static TBLOBMakeTBLOB (Pix *pix)
static void NormalizeTBLOB (TBLOB *tblob, ROW *row, bool numeric_mode, DENORM *denorm)
static void DeleteBlockList (BLOCK_LIST *block_list)

Protected Member Functions

TESS_LOCAL bool InternalSetImage ()
virtual TESS_LOCAL void Threshold (Pix **pix)
TESS_LOCAL int FindLines ()
TESS_LOCAL void ClearResults ()
TESS_LOCAL LTRResultIteratorGetLTRIterator ()
TESS_LOCAL int TextLength (int *blob_count)
TESS_LOCAL void AdaptToCharacter (const char *unichar_repr, int length, float baseline, float xheight, float descender, float ascender)
TESS_LOCAL PAGE_RESRecognitionPass1 (BLOCK_LIST *block_list)
TESS_LOCAL PAGE_RESRecognitionPass2 (BLOCK_LIST *block_list, PAGE_RES *pass1_result)
TESS_LOCAL void DetectParagraphs (int debug_level)
TESS_LOCAL const PAGE_RESGetPageRes () const

Static Protected Member Functions

static TESS_LOCAL int TesseractExtractResult (char **text, int **lengths, float **costs, int **x0, int **y0, int **x1, int **y1, PAGE_RES *page_res)

Protected Attributes

Tesseracttesseract_
 The underlying data object.
Tesseractosd_tesseract_
 For orientation & script detection.
EquationDetectequ_detect_
 The equation detector.
ImageThresholderthresholder_
 Image thresholding module.
GenericVector< ParagraphModel * > * paragraph_models_
BLOCK_LIST * block_list_
 The page layout.
PAGE_RESpage_res_
 The page-level data.
STRINGinput_file_
 Name used by training code.
STRINGoutput_file_
 Name used by debug code.
STRINGdatapath_
 Current location of tessdata.
STRINGlanguage_
 Last initialized language.
OcrEngineMode last_oem_requested_
 Last ocr language mode requested.
bool recognition_done_
 page_res_ contains recognition data.
TruthCallbacktruth_cb_
int rect_left_
int rect_top_
int rect_width_
int rect_height_
int image_width_
int image_height_

Detailed Description

Base class for all tesseract APIs. Specific classes can add ability to work on different inputs or produce different outputs. This class is mostly an interface layer on top of the Tesseract instance class to hide the data types so that users of this class don't have to include any other Tesseract headers.

Definition at line 102 of file baseapi.h.


Constructor & Destructor Documentation

tesseract::TessBaseAPI::TessBaseAPI ( )

Definition at line 91 of file baseapi.cpp.

  : tesseract_(NULL),
    osd_tesseract_(NULL),
    equ_detect_(NULL),
    // Thresholder is initialized to NULL here, but will be set before use by:
    // A constructor of a derived API,  SetThresholder(), or
    // created implicitly when used in InternalSetImage.
    thresholder_(NULL),
    paragraph_models_(NULL),
    block_list_(NULL),
    page_res_(NULL),
    input_file_(NULL),
    output_file_(NULL),
    datapath_(NULL),
    language_(NULL),
    last_oem_requested_(OEM_DEFAULT),
    recognition_done_(false),
    truth_cb_(NULL),
    rect_left_(0), rect_top_(0), rect_width_(0), rect_height_(0),
    image_width_(0), image_height_(0) {
}
tesseract::TessBaseAPI::~TessBaseAPI ( ) [virtual]

Definition at line 113 of file baseapi.cpp.

                          {
  End();
}

Member Function Documentation

void tesseract::TessBaseAPI::ClearAdaptiveClassifier ( )

Call between pages or documents etc to free up memory and forget adaptive data.

Definition at line 371 of file baseapi.cpp.

                                          {
  if (tesseract_ == NULL)
    return;
  tesseract_->ResetAdaptiveClassifier();
  tesseract_->ResetDocumentDictionary();
}
void tesseract::TessBaseAPI::ClearResults ( ) [protected]

Delete the pageres and block list ready for a new page.

Delete the pageres and clear the block list ready for a new page.

Definition at line 1641 of file baseapi.cpp.

                               {
  if (tesseract_ != NULL) {
    tesseract_->Clear();
  }
  if (page_res_ != NULL) {
    delete page_res_;
    page_res_ = NULL;
  }
  recognition_done_ = false;
  if (block_list_ == NULL)
    block_list_ = new BLOCK_LIST;
  else
    block_list_->clear();
  if (paragraph_models_ != NULL) {
    paragraph_models_->delete_data_pointers();
    delete paragraph_models_;
    paragraph_models_ = NULL;
  }
}
int tesseract::TessBaseAPI::FindLines ( ) [protected]

Find lines from the image making the BLOCK_LIST.

Returns:
0 on success.

Find lines from the image making the BLOCK_LIST.

Definition at line 1578 of file baseapi.cpp.

                           {
  if (thresholder_ == NULL || thresholder_->IsEmpty()) {
    tprintf("Please call SetImage before attempting recognition.");
    return -1;
  }
  if (recognition_done_)
    ClearResults();
  if (!block_list_->empty()) {
    return 0;
  }
  if (tesseract_ == NULL) {
    tesseract_ = new Tesseract;
    tesseract_->InitAdaptiveClassifier(false);
  }
  if (tesseract_->pix_binary() == NULL)
    Threshold(tesseract_->mutable_pix_binary());
  if (tesseract_->ImageWidth() > MAX_INT16 ||
      tesseract_->ImageHeight() > MAX_INT16) {
    tprintf("Image too large: (%d, %d)\n",
            tesseract_->ImageWidth(), tesseract_->ImageHeight());
    return -1;
  }

  tesseract_->PrepareForPageseg();

  if (tesseract_->textord_equation_detect) {
    if (equ_detect_ == NULL && datapath_ != NULL) {
      equ_detect_ = new EquationDetect(datapath_->string(), NULL);
    }
    tesseract_->SetEquationDetect(equ_detect_);
  }

  Tesseract* osd_tess = osd_tesseract_;
  OSResults osr;
  if (PSM_OSD_ENABLED(tesseract_->tessedit_pageseg_mode) && osd_tess == NULL) {
    if (strcmp(language_->string(), "osd") == 0) {
      osd_tess = tesseract_;
    } else {
      osd_tesseract_ = new Tesseract;
      if (osd_tesseract_->init_tesseract(
          datapath_->string(), NULL, "osd", OEM_TESSERACT_ONLY,
          NULL, 0, NULL, NULL, false) == 0) {
        osd_tess = osd_tesseract_;
        osd_tesseract_->set_source_resolution(
            thresholder_->GetSourceYResolution());
      } else {
        tprintf("Warning: Auto orientation and script detection requested,"
                " but osd language failed to load\n");
        delete osd_tesseract_;
        osd_tesseract_ = NULL;
      }
    }
  }

  if (tesseract_->SegmentPage(input_file_, block_list_, osd_tess, &osr) < 0)
    return -1;
  // If Devanagari is being recognized, we use different images for page seg
  // and for OCR.
  tesseract_->PrepareForTessOCR(block_list_, osd_tess, &osr);
  return 0;
}
bool tesseract::TessBaseAPI::GetBoolVariable ( const char *  name,
bool *  value 
) const

Definition at line 163 of file baseapi.cpp.

                                                                     {
  BoolParam *p = ParamUtils::FindParam<BoolParam>(
      name, GlobalParams()->bool_params, tesseract_->params()->bool_params);
  if (p == NULL) return false;
  *value = (BOOL8)(*p);
  return true;
}
bool tesseract::TessBaseAPI::GetDoubleVariable ( const char *  name,
double *  value 
) const

Definition at line 177 of file baseapi.cpp.

                                                                         {
  DoubleParam *p = ParamUtils::FindParam<DoubleParam>(
      name, GlobalParams()->double_params, tesseract_->params()->double_params);
  if (p == NULL) return false;
  *value = (double)(*p);
  return true;
}
const char * tesseract::TessBaseAPI::GetInitLanguagesAsString ( ) const

Returns the languages string used in the last valid initialization. If the last initialization specified "deu+hin" then that will be returned. If hin loaded eng automatically as well, then that will not be included in this list. To find the languages actually loaded use GetLoadedLanguagesAsVector. The returned string should NOT be deleted.

Definition at line 259 of file baseapi.cpp.

                                                        {
  return (language_ == NULL || language_->string() == NULL) ?
      "" : language_->string();
}
bool tesseract::TessBaseAPI::GetIntVariable ( const char *  name,
int *  value 
) const

Returns true if the parameter was found among Tesseract parameters. Fills in value with the value of the parameter.

Definition at line 155 of file baseapi.cpp.

                                                                   {
  IntParam *p = ParamUtils::FindParam<IntParam>(
      name, GlobalParams()->int_params, tesseract_->params()->int_params);
  if (p == NULL) return false;
  *value = (inT32)(*p);
  return true;
}
void tesseract::TessBaseAPI::GetLoadedLanguagesAsVector ( GenericVector< STRING > *  langs) const

Returns the loaded languages in the vector of STRINGs. Includes all languages loaded by the last Init, including those loaded as dependencies of other loaded languages.

Definition at line 269 of file baseapi.cpp.

                                        {
  langs->clear();
  if (tesseract_ != NULL) {
    langs->push_back(tesseract_->lang);
    int num_subs = tesseract_->num_sub_langs();
    for (int i = 0; i < num_subs; ++i)
      langs->push_back(tesseract_->get_sub_lang(i)->lang);
  }
}
LTRResultIterator * tesseract::TessBaseAPI::GetLTRIterator ( ) [protected]

Return an LTR Result Iterator -- used only for training, as we really want to ignore all BiDi smarts at that point. delete once you're done with it.

Get a left-to-right iterator to the results of LayoutAnalysis and/or Recognize. The returned iterator must be deleted after use.

Definition at line 917 of file baseapi.cpp.

                                               {
  if (tesseract_ == NULL || page_res_ == NULL)
    return NULL;
  return new LTRResultIterator(
      page_res_, tesseract_,
      thresholder_->GetScaleFactor(), thresholder_->GetScaledYResolution(),
      rect_left_, rect_top_, rect_width_, rect_height_);
}
PageSegMode tesseract::TessBaseAPI::GetPageSegMode ( ) const

Return the current page segmentation mode.

Definition at line 329 of file baseapi.cpp.

                                              {
  if (tesseract_ == NULL)
    return PSM_SINGLE_BLOCK;
  return static_cast<PageSegMode>(
    static_cast<int>(tesseract_->tessedit_pageseg_mode));
}
const char * tesseract::TessBaseAPI::GetStringVariable ( const char *  name) const

Returns the pointer to the string that represents the value of the parameter if it was found among Tesseract parameters.

Definition at line 171 of file baseapi.cpp.

                                                                 {
  StringParam *p = ParamUtils::FindParam<StringParam>(
      name, GlobalParams()->string_params, tesseract_->params()->string_params);
  return (p != NULL) ? p->string() : NULL;
}
bool tesseract::TessBaseAPI::GetVariableAsString ( const char *  name,
STRING val 
)

Get value of named variable as a string, if it exists.

Definition at line 186 of file baseapi.cpp.

                                                                   {
  return ParamUtils::GetParamAsString(name, tesseract_->params(), val);
}
int tesseract::TessBaseAPI::Init ( const char *  datapath,
const char *  language,
OcrEngineMode  oem,
char **  configs,
int  configs_size,
const GenericVector< STRING > *  vars_vec,
const GenericVector< STRING > *  vars_values,
bool  set_only_non_debug_params 
)

Instances are now mostly thread-safe and totally independent, but some global parameters remain. Basically it is safe to use multiple TessBaseAPIs in different threads in parallel, UNLESS: you use SetVariable on some of the Params in classify and textord. If you do, then the effect will be to change it for all your instances.

Start tesseract. Returns zero on success and -1 on failure. NOTE that the only members that may be called before Init are those listed above here in the class definition.

The datapath must be the name of the parent directory of tessdata and must end in / . Any name after the last / will be stripped. The language is (usually) an ISO 639-3 string or NULL will default to eng. It is entirely safe (and eventually will be efficient too) to call Init multiple times on the same instance to change language, or just to reset the classifier. The language may be a string of the form [~]<lang>[+[~]<lang>]* indicating that multiple languages are to be loaded. Eg hin+eng will load Hindi and English. Languages may specify internally that they want to be loaded with one or more other languages, so the ~ sign is available to override that. Eg if hin were set to load eng by default, then hin+~eng would force loading only hin. The number of loaded languages is limited only by memory, with the caveat that loading additional languages will impact both speed and accuracy, as there is more work to do to decide on the applicable language, and there is more chance of hallucinating incorrect words. WARNING: On changing languages, all Tesseract parameters are reset back to their default values. (Which may vary between languages.) If you have a rare need to set a Variable that controls initialization for a second call to Init you should explicitly call End() and then use SetVariable before Init. This is only a very rare use case, since there are very few uses that require any parameters to be set before Init.

If set_only_non_debug_params is true, only params that do not contain "debug" in the name will be set.

The datapath must be the name of the data directory (no ending /) or some other file in which the data directory resides (for instance argv[0].) The language is (usually) an ISO 639-3 string or NULL will default to eng. If numeric_mode is true, then only digits and Roman numerals will be returned.

Returns:
: 0 on success and -1 on initialization failure.

Definition at line 203 of file baseapi.cpp.

                                                      {
  // Default language is "eng".
  if (language == NULL) language = "eng";
  // If the datapath, OcrEngineMode or the language have changed - start again.
  // Note that the language_ field stores the last requested language that was
  // initialized successfully, while tesseract_->lang stores the language
  // actually used. They differ only if the requested language was NULL, in
  // which case tesseract_->lang is set to the Tesseract default ("eng").
  if (tesseract_ != NULL &&
      (datapath_ == NULL || language_ == NULL ||
       *datapath_ != datapath || last_oem_requested_ != oem ||
       (*language_ != language && tesseract_->lang != language))) {
    delete tesseract_;
    tesseract_ = NULL;
  }

  bool reset_classifier = true;
  if (tesseract_ == NULL) {
    reset_classifier = false;
    tesseract_ = new Tesseract;
    if (tesseract_->init_tesseract(
            datapath, output_file_ != NULL ? output_file_->string() : NULL,
            language, oem, configs, configs_size, vars_vec, vars_values,
            set_only_non_debug_params) != 0) {
      return -1;
    }
  }
  // Update datapath and language requested for the last valid initialization.
  if (datapath_ == NULL)
    datapath_ = new STRING(datapath);
  else
    *datapath_ = datapath;
  if (language_ == NULL)
    language_ = new STRING(language);
  else
    *language_ = language;
  last_oem_requested_ = oem;

  // For same language and datapath, just reset the adaptive classifier.
  if (reset_classifier) tesseract_->ResetAdaptiveClassifier();

  return 0;
}
int tesseract::TessBaseAPI::Init ( const char *  datapath,
const char *  language,
OcrEngineMode  oem 
) [inline]

Definition at line 206 of file baseapi.h.

                                                                          {
    return Init(datapath, language, oem, NULL, 0, NULL, NULL, false);
  }
int tesseract::TessBaseAPI::Init ( const char *  datapath,
const char *  language 
) [inline]

Definition at line 209 of file baseapi.h.

                                                       {
    return Init(datapath, language, OEM_DEFAULT, NULL, 0, NULL, NULL, false);
  }
void tesseract::TessBaseAPI::InitForAnalysePage ( )

Init only for page layout analysis. Use only for calls to SetImage and AnalysePage. Calls that attempt recognition will generate an error.

Definition at line 296 of file baseapi.cpp.

                                     {
  if (tesseract_ == NULL) {
    tesseract_ = new Tesseract;
    tesseract_->InitAdaptiveClassifier(false);
  }
}
int tesseract::TessBaseAPI::InitLangMod ( const char *  datapath,
const char *  language 
)

Init only the lang model component of Tesseract. The only functions that work after this init are SetVariable and IsValidWord. WARNING: temporary! This function will be removed from here and placed in a separate API at some future time.

Definition at line 286 of file baseapi.cpp.

                                                                       {
  if (tesseract_ == NULL)
    tesseract_ = new Tesseract;
  return tesseract_->init_tesseract_lm(datapath, NULL, language);
}
bool tesseract::TessBaseAPI::InternalSetImage ( ) [protected]

Common code for setting the image. Returns true if Init has been called.

Common code for setting the image.

Definition at line 1528 of file baseapi.cpp.

                                   {
  if (tesseract_ == NULL) {
    tprintf("Please call Init before attempting to send an image.");
    return false;
  }
  if (thresholder_ == NULL)
    thresholder_ = new ImageThresholder;
  ClearResults();
  return true;
}
void tesseract::TessBaseAPI::PrintVariables ( FILE *  fp) const

Print Tesseract parameters to the given file.

Definition at line 191 of file baseapi.cpp.

                                               {
  ParamUtils::PrintParams(fp, tesseract_->params());
}
void tesseract::TessBaseAPI::ReadConfigFile ( const char *  filename)

Read a "config" file containing a set of param, value pairs. Searches the standard places: tessdata/configs, tessdata/tessconfigs and also accepts a relative or absolute path name. Note: only non-init params will be set (init params are set by Init()).

Read a "config" file containing a set of parameter name, value pairs. Searches the standard places: tessdata/configs, tessdata/tessconfigs and also accepts a relative or absolute path name.

Definition at line 308 of file baseapi.cpp.

                                                     {
  tesseract_->read_config_file(filename, SET_PARAM_CONSTRAINT_NON_INIT_ONLY);
}
void tesseract::TessBaseAPI::ReadDebugConfigFile ( const char *  filename)

Same as above, but only set debug params from the given config file.

Definition at line 313 of file baseapi.cpp.

                                                          {
  tesseract_->read_config_file(filename, SET_PARAM_CONSTRAINT_DEBUG_ONLY);
}
bool tesseract::TessBaseAPI::SetDebugVariable ( const char *  name,
const char *  value 
)

Definition at line 149 of file baseapi.cpp.

                                                                      {
  if (tesseract_ == NULL) tesseract_ = new Tesseract;
  return ParamUtils::SetParam(name, value, SET_PARAM_CONSTRAINT_DEBUG_ONLY,
                              tesseract_->params());
}
void tesseract::TessBaseAPI::SetInputName ( const char *  name)

Set the name of the input file. Needed only for training and reading a UNLV zone file.

Set the name of the input file. Needed only for training and loading a UNLV zone file.

Definition at line 128 of file baseapi.cpp.

                                               {
  if (input_file_ == NULL)
    input_file_ = new STRING(name);
  else
    *input_file_ = name;
}
void tesseract::TessBaseAPI::SetOutputName ( const char *  name)

Set the name of the bonus output files. Needed only for debugging.

Set the name of the output files. Needed only for debugging.

Definition at line 136 of file baseapi.cpp.

                                                {
  if (output_file_ == NULL)
    output_file_ = new STRING(name);
  else
    *output_file_ = name;
}
void tesseract::TessBaseAPI::SetPageSegMode ( PageSegMode  mode)

Set the current page segmentation mode. Defaults to PSM_SINGLE_BLOCK. The mode is stored as an IntParam so it can also be modified by ReadConfigFile or SetVariable("tessedit_pageseg_mode", mode as string).

Set the current page segmentation mode. Defaults to PSM_AUTO. The mode is stored as an IntParam so it can also be modified by ReadConfigFile or SetVariable("tessedit_pageseg_mode", mode as string).

Definition at line 322 of file baseapi.cpp.

                                                 {
  if (tesseract_ == NULL)
    tesseract_ = new Tesseract;
  tesseract_->tessedit_pageseg_mode.set_value(mode);
}
bool tesseract::TessBaseAPI::SetVariable ( const char *  name,
const char *  value 
)

Set the value of an internal "parameter." Supply the name of the parameter and the value as a string, just as you would in a config file. Returns false if the name lookup failed. Eg SetVariable("tessedit_char_blacklist", "xyz"); to ignore x, y and z. Or SetVariable("classify_bln_numeric_mode", "1"); to set numeric-only mode. SetVariable may be used before Init, but settings will revert to defaults on End(). TODO(rays) Add a command-line option to dump the parameters to stdout and add a pointer to it in the FAQ

Note: Must be called after Init(). Only works for non-init variables (init variables should be passed to Init()).

Definition at line 143 of file baseapi.cpp.

                                                                 {
  if (tesseract_ == NULL) tesseract_ = new Tesseract;
  return ParamUtils::SetParam(name, value, SET_PARAM_CONSTRAINT_NON_INIT_ONLY,
                              tesseract_->params());
}
char * tesseract::TessBaseAPI::TesseractRect ( const unsigned char *  imagedata,
int  bytes_per_pixel,
int  bytes_per_line,
int  left,
int  top,
int  width,
int  height 
)

Recognize a rectangle from an image and return the result as a string. May be called many times for a single Init. Currently has no error checking. Greyscale of 8 and color of 24 or 32 bits per pixel may be given. Palette color images will not work properly and must be converted to 24 bit. Binary images of 1 bit per pixel may also be given but they must be byte packed with the MSB of the first byte being the first pixel, and a 1 represents WHITE. For binary images set bytes_per_pixel=0. The recognized text is returned as a char* which is coded as UTF8 and must be freed with the delete [] operator.

Note that TesseractRect is the simplified convenience interface. For advanced uses, use SetImage, (optionally) SetRectangle, Recognize, and one or more of the Get*Text functions below.

Recognize a rectangle from an image and return the result as a string. May be called many times for a single Init. Currently has no error checking. Greyscale of 8 and color of 24 or 32 bits per pixel may be given. Palette color images will not work properly and must be converted to 24 bit. Binary images of 1 bit per pixel may also be given but they must be byte packed with the MSB of the first byte being the first pixel, and a one pixel is WHITE. For binary images set bytes_per_pixel=0. The recognized text is returned as a char* which is coded as UTF8 and must be freed with the delete [] operator.

Definition at line 349 of file baseapi.cpp.

                                                        {
  if (tesseract_ == NULL || width < kMinRectSize || height < kMinRectSize)
    return NULL;  // Nothing worth doing.

  // Since this original api didn't give the exact size of the image,
  // we have to invent a reasonable value.
  int bits_per_pixel = bytes_per_pixel == 0 ? 1 : bytes_per_pixel * 8;
  SetImage(imagedata, bytes_per_line * 8 / bits_per_pixel, height + top,
           bytes_per_pixel, bytes_per_line);
  SetRectangle(left, top, width, height);

  return GetUTF8Text();
}
int tesseract::TessBaseAPI::TextLength ( int *  blob_count) [protected]

Return the length of the output text string, as UTF8, assuming one newline per line and one per block, with a terminator, and assuming a single character reject marker for each rejected character. Also return the number of recognized blobs in blob_count.

Return the length of the output text string, as UTF8, assuming liberally two spacing marks after each word (as paragraphs end with two newlines), and assuming a single character reject marker for each rejected character. Also return the number of recognized blobs in blob_count.

Definition at line 1668 of file baseapi.cpp.

                                           {
  if (tesseract_ == NULL || page_res_ == NULL)
    return 0;

  PAGE_RES_IT   page_res_it(page_res_);
  int total_length = 2;
  int total_blobs = 0;
  // Iterate over the data structures to extract the recognition result.
  for (page_res_it.restart_page(); page_res_it.word () != NULL;
       page_res_it.forward()) {
    WERD_RES *word = page_res_it.word();
    WERD_CHOICE* choice = word->best_choice;
    if (choice != NULL) {
      total_blobs += choice->length() + 2;
      total_length += choice->unichar_string().length() + 2;
      for (int i = 0; i < word->reject_map.length(); ++i) {
        if (word->reject_map[i].rejected())
          ++total_length;
      }
    }
  }
  if (blob_count != NULL)
    *blob_count = total_blobs;
  return total_length;
}
void tesseract::TessBaseAPI::Threshold ( Pix **  pix) [protected, virtual]

Run the thresholder to make the thresholded image. If pix is not NULL, the source is thresholded to pix instead of the internal IMAGE.

Run the thresholder to make the thresholded image, returned in pix, which must not be NULL. *pix must be initialized to NULL, or point to an existing pixDestroyable Pix. The usual argument to Threshold is Tesseract::mutable_pix_binary().

Definition at line 1545 of file baseapi.cpp.

                                     {
  ASSERT_HOST(pix != NULL);
  if (!thresholder_->IsBinary()) {
    tesseract_->set_pix_grey(thresholder_->GetPixRectGrey());
  }
  if (*pix != NULL)
    pixDestroy(pix);
  // Zero resolution messes up the algorithms, so make sure it is credible.
  int y_res = thresholder_->GetScaledYResolution();
  if (y_res < kMinCredibleResolution || y_res > kMaxCredibleResolution) {
    // Use the minimum default resolution, as it is safer to under-estimate
    // than over-estimate resolution.
    thresholder_->SetSourceYResolution(kMinCredibleResolution);
  }
  thresholder_->ThresholdToPix(pix);
  thresholder_->GetImageSizes(&rect_left_, &rect_top_,
                              &rect_width_, &rect_height_,
                              &image_width_, &image_height_);
  // Set the internal resolution that is used for layout parameters from the
  // estimated resolution, rather than the image resolution, which may be
  // fabricated, but we will use the image resolution, if there is one, to
  // report output point sizes.
  int estimated_res = ClipToRange(thresholder_->GetScaledEstimatedResolution(),
                                  kMinCredibleResolution,
                                  kMaxCredibleResolution);
  if (estimated_res != thresholder_->GetScaledEstimatedResolution()) {
    tprintf("Estimated resolution %d out of range! Corrected to %d\n",
            thresholder_->GetScaledEstimatedResolution(), estimated_res);
  }
  tesseract_->set_source_resolution(estimated_res);
}
const char * tesseract::TessBaseAPI::Version ( ) [static]

Returns the version identifier as a static string. Do not delete.

Definition at line 120 of file baseapi.cpp.

                                 {
  return VERSION;
}

Member Data Documentation

BLOCK_LIST* tesseract::TessBaseAPI::block_list_ [protected]

The page layout.

Definition at line 762 of file baseapi.h.

Current location of tessdata.

Definition at line 766 of file baseapi.h.

The equation detector.

Definition at line 759 of file baseapi.h.

Name used by training code.

Definition at line 764 of file baseapi.h.

Last initialized language.

Definition at line 767 of file baseapi.h.

Last ocr language mode requested.

Definition at line 768 of file baseapi.h.

For orientation & script detection.

Definition at line 758 of file baseapi.h.

Name used by debug code.

Definition at line 765 of file baseapi.h.

The page-level data.

Definition at line 763 of file baseapi.h.

page_res_ contains recognition data.

Definition at line 769 of file baseapi.h.

The underlying data object.

Definition at line 753 of file baseapi.h.

Image thresholding module.

Definition at line 760 of file baseapi.h.

Definition at line 770 of file baseapi.h.


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