BLOCK Class Reference

#include <ocrblock.h>

Inheritance diagram for BLOCK:

Public Member Functions
	BLOCK ()
	BLOCK (const char *name, BOOL8 prop, int16_t kern, int16_t space, int16_t xmin, int16_t ymin, int16_t xmax, int16_t ymax)
	~BLOCK ()=default
void	set_stats (BOOL8 prop, int16_t kern, int16_t space, int16_t ch_pitch)
void	set_xheight (int32_t height)
	set char size More...
void	set_font_class (int16_t font)
	set font class More...
BOOL8	prop () const
	return proportional More...
bool	right_to_left () const
void	set_right_to_left (bool value)
int32_t	fixed_pitch () const
	return pitch More...
int16_t	kern () const
	return kerning More...
int16_t	font () const
	return font class More...
int16_t	space () const
	return spacing More...
const char *	name () const
	return filename More...
int32_t	x_height () const
	return xheight More...
float	cell_over_xheight () const
void	set_cell_over_xheight (float ratio)
ROW_LIST *	row_list ()
	get rows More...
void	compute_row_margins ()
PARA_LIST *	para_list ()
C_BLOB_LIST *	blob_list ()
	get blobs More...
C_BLOB_LIST *	reject_blobs ()
FCOORD	re_rotation () const
void	set_re_rotation (const FCOORD &rotation)
FCOORD	classify_rotation () const
void	set_classify_rotation (const FCOORD &rotation)
FCOORD	skew () const
void	set_skew (const FCOORD &skew)
const ICOORD &	median_size () const
void	set_median_size (int x, int y)
Pix *	render_mask (TBOX *mask_box)
TBOX	restricted_bounding_box (bool upper_dots, bool lower_dots) const
void	reflect_polygon_in_y_axis ()
void	rotate (const FCOORD &rotation)
void	sort_rows ()
	decreasing y order More...
void	compress ()
	shrink white space More...
void	check_pitch ()
	check proportional More...
void	compress (const ICOORD vec)
	shrink white space and move by vector More...
void	print (FILE *fp, bool dump)
	dump whole table More...
BLOCK &	operator= (const BLOCK &source)
Public Member Functions inherited from ELIST_LINK
	ELIST_LINK ()
	ELIST_LINK (const ELIST_LINK &)
void	operator= (const ELIST_LINK &)

Public Attributes
PDBLK	pdblk

Friends
class	BLOCK_RECT_IT

Detailed Description

Definition at line 30 of file ocrblock.h.

Constructor & Destructor Documentation

BLOCK() [1/2]

BLOCK::BLOCK ( )

inline

Definition at line 35 of file ocrblock.h.

    : re_rotation_(1.0f, 0.0f),
      classify_rotation_(1.0f, 0.0f),
      skew_(1.0f, 0.0f) {
    right_to_left_ = false;
    pdblk.hand_poly = nullptr;
  }

BLOCK() [2/2]

BLOCK::BLOCK	(	const char *	name,
		BOOL8	prop,
		int16_t	kern,
		int16_t	space,
		int16_t	xmin,
		int16_t	ymin,
		int16_t	xmax,
		int16_t	ymax
	)

BLOCK::BLOCK

Constructor for a simple rectangular block.

Definition at line 34 of file ocrblock.cpp.

  : pdblk(xmin, ymin, xmax, ymax),
    filename(name),
    re_rotation_(1.0f, 0.0f),
    classify_rotation_(1.0f, 0.0f),
    skew_(1.0f, 0.0f) {
  ICOORDELT_IT left_it = &pdblk.leftside;
  ICOORDELT_IT right_it = &pdblk.rightside;

  proportional = prop;
  right_to_left_ = false;
  kerning = kern;
  spacing = space;
  font_class = -1;               //not assigned
  cell_over_xheight_ = 2.0f;
  pdblk.hand_poly = nullptr;
  left_it.set_to_list (&pdblk.leftside);
  right_it.set_to_list (&pdblk.rightside);
                                 //make default box
  left_it.add_to_end (new ICOORDELT (xmin, ymin));
  left_it.add_to_end (new ICOORDELT (xmin, ymax));
  right_it.add_to_end (new ICOORDELT (xmax, ymin));
  right_it.add_to_end (new ICOORDELT (xmax, ymax));
}

~BLOCK()

BLOCK::~BLOCK ( )

default

Member Function Documentation

blob_list()

C_BLOB_LIST* BLOCK::blob_list ( )

inline

get blobs

Definition at line 130 of file ocrblock.h.

                           {
    return &c_blobs;
  }

cell_over_xheight()

float BLOCK::cell_over_xheight ( ) const

inline

Definition at line 111 of file ocrblock.h.

                                  {
    return cell_over_xheight_;
  }

check_pitch()

void BLOCK::check_pitch

(

)

check proportional

BLOCK::check_pitch

Check whether the block is fixed or prop, set the flag, and set the pitch if it is fixed.

Definition at line 168 of file ocrblock.cpp.

                        {  // check prop
  //      tprintf("Missing FFT fixed pitch stuff!\n");
  pitch = -1;
}

classify_rotation()

FCOORD BLOCK::classify_rotation ( ) const

inline

Definition at line 142 of file ocrblock.h.

                                   {
    return classify_rotation_;   // Apply this before classifying.
  }

compress() [1/2]

void BLOCK::compress

(

)

shrink white space

BLOCK::compress

Delete space between the rows. (And maybe one day, compress the rows) Fill space of block from top down, left aligning rows.

Definition at line 130 of file ocrblock.cpp.

                     {  // squash it up
  #define           ROW_SPACING 5

  ROW_IT row_it(&rows);
  ROW *row;
  ICOORD row_spacing (0, ROW_SPACING);

  ICOORDELT_IT icoordelt_it;

  sort_rows();

  pdblk.box = TBOX (pdblk.box.topleft (), pdblk.box.topleft ());
  pdblk.box.move_bottom_edge (ROW_SPACING);
  for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
    row = row_it.data ();
    row->move (pdblk.box.botleft () - row_spacing -
      row->bounding_box ().topleft ());
    pdblk.box += row->bounding_box ();
  }

  pdblk.leftside.clear ();
  icoordelt_it.set_to_list (&pdblk.leftside);
  icoordelt_it.add_to_end (new ICOORDELT (pdblk.box.left (), pdblk.box.bottom ()));
  icoordelt_it.add_to_end (new ICOORDELT (pdblk.box.left (), pdblk.box.top ()));
  pdblk.rightside.clear ();
  icoordelt_it.set_to_list (&pdblk.rightside);
  icoordelt_it.add_to_end (new ICOORDELT (pdblk.box.right (), pdblk.box.bottom ()));
  icoordelt_it.add_to_end (new ICOORDELT (pdblk.box.right (), pdblk.box.top ()));
}

compress() [2/2]

void BLOCK::compress

(

const ICOORD

vec

)

shrink white space and move by vector

BLOCK::compress

Compress and move in a single operation.

Definition at line 180 of file ocrblock.cpp.

                      {
  pdblk.box.move (vec);
  compress();
}

compute_row_margins()

void BLOCK::compute_row_margins

(

)

Definition at line 331 of file ocrblock.cpp.

                                {
  if (row_list()->empty() || row_list()->singleton()) {
    return;
  }

  // If Layout analysis was not called, default to this.
  POLY_BLOCK rect_block(pdblk.bounding_box(), PT_FLOWING_TEXT);
  POLY_BLOCK *pblock = &rect_block;
  if (pdblk.poly_block() != nullptr) {
    pblock = pdblk.poly_block();
  }

  // Step One: Determine if there is a drop-cap.
  //           TODO(eger): Fix up drop cap code for RTL languages.
  ROW_IT r_it(row_list());
  ROW *first_row = r_it.data();
  ROW *second_row = r_it.data_relative(1);

  // initialize the bottom of a fictitious drop cap far above the first line.
  int drop_cap_bottom = first_row->bounding_box().top() +
                        first_row->bounding_box().height();
  int drop_cap_right = first_row->bounding_box().left();
  int mid_second_line = second_row->bounding_box().top() -
                        second_row->bounding_box().height() / 2;
  WERD_IT werd_it(r_it.data()->word_list());  // words of line one
  if (!werd_it.empty()) {
    C_BLOB_IT cblob_it(werd_it.data()->cblob_list());
    for (cblob_it.mark_cycle_pt(); !cblob_it.cycled_list();
         cblob_it.forward()) {
      TBOX bbox = cblob_it.data()->bounding_box();
      if (bbox.bottom() <= mid_second_line) {
        // we found a real drop cap
        first_row->set_has_drop_cap(true);
        if (drop_cap_bottom >  bbox.bottom())
          drop_cap_bottom = bbox.bottom();
        if (drop_cap_right < bbox.right())
          drop_cap_right = bbox.right();
      }
    }
  }

  // Step Two: Calculate the margin from the text of each row to the block
  //           (or drop-cap) boundaries.
  PB_LINE_IT lines(pblock);
  r_it.set_to_list(row_list());
  for (r_it.mark_cycle_pt(); !r_it.cycled_list(); r_it.forward()) {
    ROW *row = r_it.data();
    TBOX row_box = row->bounding_box();
    int left_y = row->base_line(row_box.left()) + row->x_height();
    int left_margin;
    const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments_left(
        lines.get_line(left_y));
    LeftMargin(segments_left.get(), row_box.left(), &left_margin);

    if (row_box.top() >= drop_cap_bottom) {
      int drop_cap_distance = row_box.left() - row->space() - drop_cap_right;
      if (drop_cap_distance < 0)
        drop_cap_distance = 0;
      if (drop_cap_distance < left_margin)
        left_margin = drop_cap_distance;
    }

    int right_y = row->base_line(row_box.right()) + row->x_height();
    int right_margin;
    const std::unique_ptr</*non-const*/ ICOORDELT_LIST> segments_right(
        lines.get_line(right_y));
    RightMargin(segments_right.get(), row_box.right(), &right_margin);
    row->set_lmargin(left_margin);
    row->set_rmargin(right_margin);
  }
}

fixed_pitch()

int32_t BLOCK::fixed_pitch ( ) const

inline

return pitch

Definition at line 88 of file ocrblock.h.

                              {
    return pitch;
  }

font()

int16_t BLOCK::font ( ) const

inline

return font class

Definition at line 96 of file ocrblock.h.

                       {
    return font_class;
  }

kern()

int16_t BLOCK::kern ( ) const

inline

return kerning

Definition at line 92 of file ocrblock.h.

                       {
    return kerning;
  }

median_size()

const ICOORD& BLOCK::median_size ( ) const

inline

Definition at line 154 of file ocrblock.h.

                                    {
    return median_size_;
  }

name()

const char* BLOCK::name ( ) const

inline

return filename

Definition at line 104 of file ocrblock.h.

                           {
    return filename.string ();
  }

operator=()

BLOCK & BLOCK::operator=

(

const BLOCK &

source

)

BLOCK::operator=

Assignment - duplicate the block structure, but with an EMPTY row list.

Definition at line 226 of file ocrblock.cpp.

  {
  this->ELIST_LINK::operator= (source);
  pdblk = source.pdblk;
  proportional = source.proportional;
  kerning = source.kerning;
  spacing = source.spacing;
  filename = source.filename;    //STRINGs assign ok
  if (!rows.empty ())
    rows.clear ();
  re_rotation_ = source.re_rotation_;
  classify_rotation_ = source.classify_rotation_;
  skew_ = source.skew_;
  return *this;
}

para_list()

PARA_LIST* BLOCK::para_list ( )

inline

Definition at line 126 of file ocrblock.h.

                         {
    return &paras_;
  }

print()

void BLOCK::print	(	FILE *	fp,
		bool	dump
	)

dump whole table

BLOCK::print

Print the info on a block

Definition at line 194 of file ocrblock.cpp.

  {
  ICOORDELT_IT it = &pdblk.leftside;   //iterator

  pdblk.box.print ();
  tprintf ("Proportional= %s\n", proportional ? "TRUE" : "FALSE");
  tprintf ("Kerning= %d\n", kerning);
  tprintf ("Spacing= %d\n", spacing);
  tprintf ("Fixed_pitch=%d\n", pitch);
  tprintf ("Filename= %s\n", filename.string ());

  if (dump) {
    tprintf ("Left side coords are:\n");
    for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ())
      tprintf ("(%d,%d) ", it.data ()->x (), it.data ()->y ());
    tprintf ("\n");
    tprintf ("Right side coords are:\n");
    it.set_to_list (&pdblk.rightside);
    for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ())
      tprintf ("(%d,%d) ", it.data ()->x (), it.data ()->y ());
    tprintf ("\n");
  }
}

prop()

BOOL8 BLOCK::prop ( ) const

inline

return proportional

Definition at line 78 of file ocrblock.h.

                     {
    return proportional;
  }

re_rotation()

FCOORD BLOCK::re_rotation ( ) const

inline

Definition at line 136 of file ocrblock.h.

                             {
    return re_rotation_;         // How to transform coords back to image.
  }

reflect_polygon_in_y_axis()

void BLOCK::reflect_polygon_in_y_axis

(

)

BLOCK::reflect_polygon_in_y_axis

Reflects the polygon in the y-axis and recompute the bounding_box. Does nothing to any contained rows/words/blobs etc.

Definition at line 105 of file ocrblock.cpp.

                                      {
  pdblk.poly_block()->reflect_in_y_axis();
  pdblk.box = *pdblk.poly_block()->bounding_box();
}

reject_blobs()

C_BLOB_LIST* BLOCK::reject_blobs ( )

inline

Definition at line 133 of file ocrblock.h.

                              {
    return &rej_blobs;
  }

render_mask()

Pix* BLOCK::render_mask ( TBOX *  mask_box )

inline

Definition at line 162 of file ocrblock.h.

                                   {
    return pdblk.render_mask(re_rotation_, mask_box);
  }

restricted_bounding_box()

TBOX BLOCK::restricted_bounding_box	(	bool	upper_dots,
		bool	lower_dots
	)		const

Definition at line 89 of file ocrblock.cpp.

                                                                          {
  TBOX box;
  // This is a read-only iteration of the rows in the block.
  ROW_IT it(const_cast<ROW_LIST*>(&rows));
  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
    box += it.data()->restricted_bounding_box(upper_dots, lower_dots);
  }
  return box;
}

right_to_left()

bool BLOCK::right_to_left ( ) const

inline

Definition at line 81 of file ocrblock.h.

                             {
    return right_to_left_;
  }

rotate()

void BLOCK::rotate

(

const FCOORD &

rotation

)

BLOCK::rotate

Rotate the polygon by the given rotation and recompute the bounding_box.

Definition at line 82 of file ocrblock.cpp.

                                         {
  pdblk.poly_block()->rotate(rotation);
  pdblk.box = *pdblk.poly_block()->bounding_box();
}

row_list()

ROW_LIST* BLOCK::row_list ( )

inline

get rows

Definition at line 118 of file ocrblock.h.

                       {
    return &rows;
  }

set_cell_over_xheight()

void BLOCK::set_cell_over_xheight ( float  ratio )

inline

Definition at line 114 of file ocrblock.h.

                                          {
    cell_over_xheight_ = ratio;
  }

set_classify_rotation()

void BLOCK::set_classify_rotation ( const FCOORD &  rotation )

inline

Definition at line 145 of file ocrblock.h.

                                                     {
    classify_rotation_ = rotation;
  }

set_font_class()

void BLOCK::set_font_class ( int16_t  font )

inline

set font class

Definition at line 74 of file ocrblock.h.

                                    {
    font_class = font;
  }

set_median_size()

void BLOCK::set_median_size ( int  x, int  y  )

inline

Definition at line 157 of file ocrblock.h.

                                     {
    median_size_.set_x(x);
    median_size_.set_y(y);
  }

set_re_rotation()

void BLOCK::set_re_rotation ( const FCOORD &  rotation )

inline

Definition at line 139 of file ocrblock.h.

                                               {
    re_rotation_ = rotation;
  }

set_right_to_left()

void BLOCK::set_right_to_left ( bool  value )

inline

Definition at line 84 of file ocrblock.h.

                                     {
    right_to_left_ = value;
  }

set_skew()

void BLOCK::set_skew ( const FCOORD &  skew )

inline

Definition at line 151 of file ocrblock.h.

                                    {
    skew_ = skew;
  }

set_stats()

void BLOCK::set_stats ( BOOL8  prop, int16_t  kern, int16_t  space, int16_t  ch_pitch  )

inline

set space size etc.

Parameters

prop	proportional
kern	inter char size
space	inter word size
ch_pitch	pitch if fixed

Definition at line 60 of file ocrblock.h.

                                   {
    proportional = prop;
    kerning = (int8_t) kern;
    spacing = space;
    pitch = ch_pitch;
  }

set_xheight()

void BLOCK::set_xheight ( int32_t  height )

inline

set char size

Definition at line 70 of file ocrblock.h.

                                   {
    xheight = height;
  }

skew()

FCOORD BLOCK::skew ( ) const

inline

Definition at line 148 of file ocrblock.h.

                      {
    return skew_;                // Direction of true horizontal.
  }

sort_rows()

void BLOCK::sort_rows

(

)

decreasing y order

BLOCK::sort_rows

Order rows so that they are in order of decreasing Y coordinate

Definition at line 116 of file ocrblock.cpp.

                      {  // order on "top"
  ROW_IT row_it(&rows);

  row_it.sort (decreasing_top_order);
}

space()

int16_t BLOCK::space ( ) const

inline

return spacing

Definition at line 100 of file ocrblock.h.

                        {
    return spacing;
  }

x_height()

int32_t BLOCK::x_height ( ) const

inline

return xheight

Definition at line 108 of file ocrblock.h.

                           {
    return xheight;
  }

Friends And Related Function Documentation

BLOCK_RECT_IT

friend class BLOCK_RECT_IT

friend

Definition at line 33 of file ocrblock.h.

Member Data Documentation

pdblk

PDBLK BLOCK::pdblk

Definition at line 192 of file ocrblock.h.

---

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

• /usr/src/tesseract-ocr.master/src/ccstruct/ocrblock.h
• /usr/src/tesseract-ocr.master/src/ccstruct/ocrblock.cpp