Tesseract 3.02

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Public Member Functions | Static Public Member Functions | Protected Member Functions | Static Protected Member Functions | Protected Attributes
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
void | GetAvailableLanguagesAsVector (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)
PageIterator * | AnalyseLayout ()
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)
ResultIterator * | GetIterator ()
MutableIterator * | GetMutableIterator ()
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 Dawg * | GetDawg (int i) const
int | NumDawgs () const
Tesseract *const | tesseract () const
OcrEngineMode const | oem () const
void | InitTruthCallback (TruthCallback *cb)
CubeRecoContext * | GetCubeRecoContext () 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 ROW * | FindRowForBox (BLOCK_LIST *blocks, int left, int top, int right, int bottom)
static ROW * | MakeTessOCRRow (float baseline, float xheight, float descender, float ascender)
static TBLOB * | MakeTBLOB (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 LTRResultIterator * | GetLTRIterator ()
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_RES * | RecognitionPass1 (BLOCK_LIST *block_list)
TESS_LOCAL PAGE_RES * | RecognitionPass2 (BLOCK_LIST *block_list, PAGE_RES *pass1_result)
TESS_LOCAL void | DetectParagraphs (bool after_text_recognition)
TESS_LOCAL const PAGE_RES * | GetPageRes () 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
Tesseract * | tesseract_
| The underlying data object.
Tesseract * | osd_tesseract_
| For orientation & script detection.
EquationDetect * | equ_detect_
| The equation detector.
ImageThresholder * | thresholder_
| Image thresholding module.
GenericVector< ParagraphModel * > * | paragraph_models_
BLOCK_LIST * | block_list_
| The page layout.
PAGE_RES * | page_res_
| The page-level data.
STRING * | input_file_
| Name used by training code.
STRING * | output_file_
| Name used by debug code.
STRING * | datapath_
| Current location of tessdata.
STRING * | language_
| Last initialized language.
OcrEngineMode | last_oem_requested_
| Last ocr language mode requested.
bool | recognition_done_
| page_res_ contains recognition data.
TruthCallback * | truth_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 101 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 123 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 419 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 1699 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 1636 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;
}

void tesseract::TessBaseAPI::GetAvailableLanguagesAsVector | ( | GenericVector< STRING > * | langs | ) | const

Returns the available languages in the vector of STRINGs.

Definition at line 293 of file baseapi.cpp.

{
langs->clear();
if (tesseract_ != NULL) {
STRING pattern = tesseract_->datadir + "/*." + kTrainedDataSuffix;
#ifdef _WIN32
char fname[_MAX_FNAME];
WIN32_FIND_DATA data;
BOOL result = TRUE;
HANDLE handle = FindFirstFile(pattern.string(), &data);
if (handle != INVALID_HANDLE_VALUE) {
for (; result; result = FindNextFile(handle, &data)) {
_splitpath(data.cFileName, NULL, NULL, fname, NULL);
langs->push_back(STRING(fname));
}
FindClose(handle);
}
#else
glob_t pglob;
char **paths;
char *path, *dot;
if (glob(pattern.string(), 0, NULL, &pglob) == 0) {
for (paths = pglob.gl_pathv; *paths != NULL; paths++) {
path = basename(*paths);
if ((dot = strchr(path, '.'))) {
*dot = '\0';
langs->push_back(STRING(path));
}
}
globfree(&pglob);
}
#endif
}
}

bool tesseract::TessBaseAPI::GetBoolVariable | ( | const char * | name,
|  | bool * | value
| ) |  | const

Definition at line 173 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 187 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 269 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 165 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 279 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 973 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 377 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 181 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 196 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 213 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 344 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 334 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 1586 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 201 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 356 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 361 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 159 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 138 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 146 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 370 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 153 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 397 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 1726 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 1603 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 130 of file baseapi.cpp.

{
return VERSION;
}

## Member Data Documentation

BLOCK_LIST* tesseract::TessBaseAPI::block_list_
| protected

The page layout.

Definition at line 766 of file baseapi.h.

STRING* tesseract::TessBaseAPI::datapath_
| protected

Current location of tessdata.

Definition at line 770 of file baseapi.h.

EquationDetect* tesseract::TessBaseAPI::equ_detect_
| protected

The equation detector.

Definition at line 763 of file baseapi.h.

STRING* tesseract::TessBaseAPI::input_file_
| protected

Name used by training code.

Definition at line 768 of file baseapi.h.

STRING* tesseract::TessBaseAPI::language_
| protected

Last initialized language.

Definition at line 771 of file baseapi.h.

OcrEngineMode tesseract::TessBaseAPI::last_oem_requested_
| protected

Last ocr language mode requested.

Definition at line 772 of file baseapi.h.

Tesseract* tesseract::TessBaseAPI::osd_tesseract_
| protected

For orientation & script detection.

Definition at line 762 of file baseapi.h.

STRING* tesseract::TessBaseAPI::output_file_
| protected

Name used by debug code.

Definition at line 769 of file baseapi.h.

PAGE_RES* tesseract::TessBaseAPI::page_res_
| protected

The page-level data.

Definition at line 767 of file baseapi.h.

GenericVector<ParagraphModel *>* tesseract::TessBaseAPI::paragraph_models_
| protected

Definition at line 765 of file baseapi.h.

bool tesseract::TessBaseAPI::recognition_done_
| protected

page_res_ contains recognition data.

Definition at line 773 of file baseapi.h.

Tesseract* tesseract::TessBaseAPI::tesseract_
| protected

The underlying data object.

Definition at line 757 of file baseapi.h.

ImageThresholder* tesseract::TessBaseAPI::thresholder_
| protected

Image thresholding module.

Definition at line 764 of file baseapi.h.

TruthCallback* tesseract::TessBaseAPI::truth_cb_
| protected

Definition at line 774 of file baseapi.h.

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

- /mnt/data/src/tesseract-ocr/api/baseapi.h
- /mnt/data/src/tesseract-ocr/api/baseapi.cpp