tesseract 4.1.1
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tesseract::BaselineDetect Class Reference

#include <baselinedetect.h>

Public Member Functions

 BaselineDetect (int debug_level, const FCOORD &page_skew, TO_BLOCK_LIST *blocks)
 
 ~BaselineDetect ()=default
 
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 242 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 790 of file baselinedetect.cpp.

792 : page_skew_(page_skew), debug_level_(debug_level) {
793 TO_BLOCK_IT it(blocks);
794 for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
795 TO_BLOCK* to_block = it.data();
796 BLOCK* block = to_block->block;
797 POLY_BLOCK* pb = block->pdblk.poly_block();
798 // A note about non-text blocks.
799 // On output, non-text blocks are supposed to contain a single empty word
800 // in each incoming text line. These mark out the polygonal bounds of the
801 // block. Ideally no baselines should be required, but currently
802 // make_words crashes if a baseline and xheight are not provided, so we
803 // include non-text blocks here, but flag them for special treatment.
804 bool non_text = pb != nullptr && !pb->IsText();
805 blocks_.push_back(new BaselineBlock(debug_level_, non_text, to_block));
806 }
807}
BLOCK * block
Definition: blobbox.h:777
Definition: ocrblock.h:31
PDBLK pdblk
Page Description Block.
Definition: ocrblock.h:190
POLY_BLOCK * poly_block() const
Definition: pdblock.h:55
bool IsText() const
Definition: polyblk.h:49

◆ ~BaselineDetect()

tesseract::BaselineDetect::~BaselineDetect ( )
default

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 844 of file baselinedetect.cpp.

848 {
849 for (int i = 0; i < blocks_.size(); ++i) {
850 BaselineBlock* bl_block = blocks_[i];
851 if (enable_splines)
852 bl_block->PrepareForSplineFitting(page_tr, remove_noise);
853 bl_block->FitBaselineSplines(enable_splines, show_final_rows, textord);
854 if (show_final_rows) {
855 bl_block->DrawFinalRows(page_tr);
856 }
857 }
858}

◆ ComputeStraightBaselines()

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

Definition at line 812 of file baselinedetect.cpp.

812 {
813 GenericVector<double> block_skew_angles;
814 for (int i = 0; i < blocks_.size(); ++i) {
815 BaselineBlock* bl_block = blocks_[i];
816 if (debug_level_ > 0)
817 tprintf("Fitting initial baselines...\n");
818 if (bl_block->FitBaselinesAndFindSkew(use_box_bottoms)) {
819 block_skew_angles.push_back(bl_block->skew_angle());
820 }
821 }
822 // Compute a page-wide default skew for blocks with too little information.
823 double default_block_skew = page_skew_.angle();
824 if (!block_skew_angles.empty()) {
825 default_block_skew = MedianOfCircularValues(M_PI, &block_skew_angles);
826 }
827 if (debug_level_ > 0) {
828 tprintf("Page skew angle = %g\n", default_block_skew);
829 }
830 // Set bad lines in each block to the default block skew and then force fit
831 // a linespacing model where it makes sense to do so.
832 for (int i = 0; i < blocks_.size(); ++i) {
833 BaselineBlock* bl_block = blocks_[i];
834 bl_block->ParallelizeBaselines(default_block_skew);
835 bl_block->SetupBlockParameters(); // This replaced compute_row_stats.
836 }
837}
T MedianOfCircularValues(T modulus, GenericVector< T > *v)
Definition: linlsq.h:113
DLLSYM void tprintf(const char *format,...)
Definition: tprintf.cpp:35
int push_back(T object)
bool empty() const
Definition: genericvector.h:91
float angle() const
find angle
Definition: points.h:247

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