tesseract  5.0.0
tesseract::BaselineDetect Class Reference

#include <baselinedetect.h>

Public Member Functions

 BaselineDetect (int debug_level, const FCOORD &page_skew, TO_BLOCK_LIST *blocks)
 
 ~BaselineDetect ()
 
void ComputeStraightBaselines (bool use_box_bottoms)
 
void ComputeBaselineSplinesAndXheights (const ICOORD &page_tr, bool enable_splines, bool remove_noise, bool show_final_rows, Textord *textord)
 

Detailed Description

Definition at line 239 of file baselinedetect.h.

Constructor & Destructor Documentation

◆ BaselineDetect()

tesseract::BaselineDetect::BaselineDetect ( int  debug_level,
const FCOORD page_skew,
TO_BLOCK_LIST *  blocks 
)

Definition at line 846 of file baselinedetect.cpp.

848  : page_skew_(page_skew), debug_level_(debug_level) {
849  TO_BLOCK_IT it(blocks);
850  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
851  TO_BLOCK *to_block = it.data();
852  BLOCK *block = to_block->block;
853  POLY_BLOCK *pb = block->pdblk.poly_block();
854  // A note about non-text blocks.
855  // On output, non-text blocks are supposed to contain a single empty word
856  // in each incoming text line. These mark out the polygonal bounds of the
857  // block. Ideally no baselines should be required, but currently
858  // make_words crashes if a baseline and xheight are not provided, so we
859  // include non-text blocks here, but flag them for special treatment.
860  bool non_text = pb != nullptr && !pb->IsText();
861  blocks_.push_back(new BaselineBlock(debug_level_, non_text, to_block));
862  }
863 }

◆ ~BaselineDetect()

tesseract::BaselineDetect::~BaselineDetect ( )
inline

Definition at line 243 of file baselinedetect.h.

243  {
244  for (auto block : blocks_) {
245  delete block;
246  }
247  }

Member Function Documentation

◆ ComputeBaselineSplinesAndXheights()

void tesseract::BaselineDetect::ComputeBaselineSplinesAndXheights ( const ICOORD page_tr,
bool  enable_splines,
bool  remove_noise,
bool  show_final_rows,
Textord textord 
)

Definition at line 899 of file baselinedetect.cpp.

903  {
904  for (auto bl_block : blocks_) {
905  if (enable_splines) {
906  bl_block->PrepareForSplineFitting(page_tr, remove_noise);
907  }
908  bl_block->FitBaselineSplines(enable_splines, show_final_rows, textord);
909 #ifndef GRAPHICS_DISABLED
910  if (show_final_rows) {
911  bl_block->DrawFinalRows(page_tr);
912  }
913 #endif
914  }
915 }

◆ ComputeStraightBaselines()

void tesseract::BaselineDetect::ComputeStraightBaselines ( bool  use_box_bottoms)

Definition at line 868 of file baselinedetect.cpp.

868  {
869  std::vector<double> block_skew_angles;
870  for (auto bl_block : blocks_) {
871  if (debug_level_ > 0) {
872  tprintf("Fitting initial baselines...\n");
873  }
874  if (bl_block->FitBaselinesAndFindSkew(use_box_bottoms)) {
875  block_skew_angles.push_back(bl_block->skew_angle());
876  }
877  }
878  // Compute a page-wide default skew for blocks with too little information.
879  double default_block_skew = page_skew_.angle();
880  if (!block_skew_angles.empty()) {
881  default_block_skew = MedianOfCircularValues(M_PI, block_skew_angles);
882  }
883  if (debug_level_ > 0) {
884  tprintf("Page skew angle = %g\n", default_block_skew);
885  }
886  // Set bad lines in each block to the default block skew and then force fit
887  // a linespacing model where it makes sense to do so.
888  for (auto bl_block : blocks_) {
889  bl_block->ParallelizeBaselines(default_block_skew);
890  bl_block->SetupBlockParameters(); // This replaced compute_row_stats.
891  }
892 }
void tprintf(const char *format,...)
Definition: tprintf.cpp:41
T MedianOfCircularValues(T modulus, std::vector< T > &v)
Definition: linlsq.h:117
float angle() const
find angle
Definition: points.h:246

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