#include <osdetect.h>

Public Member Functions
	ScriptDetector (const GenericVector< int > allowed_scripts, OSResults osr, tesseract::Tesseract *tess)

void	detect_blob (BLOB_CHOICE_LIST *scores)

bool	must_stop (int orientation)

Detailed Description

Definition at line 95 of file osdetect.h.

Constructor & Destructor Documentation

◆ ScriptDetector()

ScriptDetector::ScriptDetector	(	const GenericVector< int > *	allowed_scripts,
		OSResults *	osr,
		tesseract::Tesseract *	tess
	)

Definition at line 453 of file osdetect.cpp.

                                                                          {
   osr_ = osr;
   tess_ = tess;
   allowed_scripts_ = allowed_scripts;
   katakana_id_ = tess_->unicharset.add_script(katakana_script);
   hiragana_id_ = tess_->unicharset.add_script(hiragana_script);
   han_id_ = tess_->unicharset.add_script(han_script);
   hangul_id_ = tess_->unicharset.add_script(hangul_script);
   japanese_id_ = tess_->unicharset.add_script(japanese_script_);
   korean_id_ = tess_->unicharset.add_script(korean_script_);
   latin_id_ = tess_->unicharset.add_script(latin_script);
   fraktur_id_ = tess_->unicharset.add_script(fraktur_script_);
 }

Member Function Documentation

◆ detect_blob()

void ScriptDetector::detect_blob ( BLOB_CHOICE_LIST * scores )

Definition at line 471 of file osdetect.cpp.

                                                          {
   bool done[kMaxNumberOfScripts];
   for (int i = 0; i < 4; ++i) {
     for (int j = 0; j < kMaxNumberOfScripts; ++j)
       done[j] = false;
 
     BLOB_CHOICE_IT choice_it;
     choice_it.set_to_list(scores + i);
 
     float prev_score = -1;
     int script_count = 0;
     int prev_id = -1;
     int prev_fontinfo_id = -1;
     const char* prev_unichar = "";
     const char* unichar = "";
 
     for (choice_it.mark_cycle_pt(); !choice_it.cycled_list();
          choice_it.forward()) {
       BLOB_CHOICE* choice = choice_it.data();
       int id = choice->script_id();
       if (allowed_scripts_ != nullptr && !allowed_scripts_->empty()) {
         // Check that the choice is in an allowed script.
         int s = 0;
         for (s = 0; s < allowed_scripts_->size(); ++s) {
           if ((*allowed_scripts_)[s] == id) break;
         }
         if (s == allowed_scripts_->size()) continue;  // Not found in list.
       }
       // Script already processed before.
       if (done[id]) continue;
       done[id] = true;
 
       unichar = tess_->unicharset.id_to_unichar(choice->unichar_id());
       // Save data from the first match
       if (prev_score < 0) {
         prev_score = -choice->certainty();
         script_count = 1;
         prev_id = id;
         prev_unichar = unichar;
         prev_fontinfo_id = choice->fontinfo_id();
       } else if (-choice->certainty() < prev_score + kNonAmbiguousMargin) {
         ++script_count;
       }
 
       if (strlen(prev_unichar) == 1)
         if (unichar[0] >= '0' && unichar[0] <= '9')
           break;
 
       // if script_count is >= 2, character is ambiguous, skip other matches
       // since they are useless.
       if (script_count >= 2)
         break;
     }
     // Character is non ambiguous
     if (script_count == 1) {
       // Update the score of the winning script
       osr_->scripts_na[i][prev_id] += 1.0;
 
       // Workaround for Fraktur
       if (prev_id == latin_id_) {
         if (prev_fontinfo_id >= 0) {
           const tesseract::FontInfo &fi =
               tess_->get_fontinfo_table().get(prev_fontinfo_id);
           //printf("Font: %s i:%i b:%i f:%i s:%i k:%i (%s)\n", fi.name,
           //       fi.is_italic(), fi.is_bold(), fi.is_fixed_pitch(),
           //       fi.is_serif(), fi.is_fraktur(),
           //       prev_unichar);
           if (fi.is_fraktur()) {
             osr_->scripts_na[i][prev_id] -= 1.0;
             osr_->scripts_na[i][fraktur_id_] += 1.0;
           }
         }
       }
 
       // Update Japanese / Korean pseudo-scripts
       if (prev_id == katakana_id_)
         osr_->scripts_na[i][japanese_id_] += 1.0;
       if (prev_id == hiragana_id_)
         osr_->scripts_na[i][japanese_id_] += 1.0;
       if (prev_id == hangul_id_)
         osr_->scripts_na[i][korean_id_] += 1.0;
       if (prev_id == han_id_) {
         osr_->scripts_na[i][korean_id_] += kHanRatioInKorean;
         osr_->scripts_na[i][japanese_id_] += kHanRatioInJapanese;
       }
     }
   }  // iterate over each orientation
 }

◆ must_stop()

bool ScriptDetector::must_stop ( int orientation )

Definition at line 560 of file osdetect.cpp.

                                               {
   osr_->update_best_script(orientation);
   return osr_->best_result.sconfidence > 1;
 }

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