tesseract::ColumnFinder Class Reference

#include <colfind.h>

Inheritance diagram for tesseract::ColumnFinder:

Public Member Functions
	ColumnFinder (int gridsize, const ICOORD &bleft, const ICOORD &tright, int resolution, bool cjk_script, double aligned_gap_fraction, TabVector_LIST *vlines, TabVector_LIST *hlines, int vertical_x, int vertical_y)
	~ColumnFinder () override
const DENORM *	denorm () const
const TextlineProjection *	projection () const
void	set_cjk_script (bool is_cjk)
void	SetupAndFilterNoise (PageSegMode pageseg_mode, Image photo_mask_pix, TO_BLOCK *input_block)
bool	IsVerticallyAlignedText (double find_vertical_text_ratio, TO_BLOCK *block, BLOBNBOX_CLIST *osd_blobs)
void	CorrectOrientation (TO_BLOCK *block, bool vertical_text_lines, int recognition_rotation)
int	FindBlocks (PageSegMode pageseg_mode, Image scaled_color, int scaled_factor, TO_BLOCK *block, Image photo_mask_pix, Image thresholds_pix, Image grey_pix, DebugPixa *pixa_debug, BLOCK_LIST *blocks, BLOBNBOX_LIST *diacritic_blobs, TO_BLOCK_LIST *to_blocks)
void	GetDeskewVectors (FCOORD *deskew, FCOORD *reskew)
void	SetEquationDetect (EquationDetectBase *detect)
Public Member Functions inherited from tesseract::TabFind
	TabFind (int gridsize, const ICOORD &bleft, const ICOORD &tright, TabVector_LIST *vlines, int vertical_x, int vertical_y, int resolution)
	~TabFind () override
void	InsertBlobsToGrid (bool h_spread, bool v_spread, BLOBNBOX_LIST *blobs, BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT > *grid)
bool	InsertBlob (bool h_spread, bool v_spread, BLOBNBOX *blob, BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT > *grid)
void	SetBlockRuleEdges (TO_BLOCK *block)
void	SetBlobRuleEdges (BLOBNBOX_LIST *blobs)
int	GutterWidth (int bottom_y, int top_y, const TabVector &v, bool ignore_unmergeables, int max_gutter_width, int *required_shift)
void	GutterWidthAndNeighbourGap (int tab_x, int mean_height, int max_gutter, bool left, BLOBNBOX *bbox, int *gutter_width, int *neighbour_gap)
int	RightEdgeForBox (const TBOX &box, bool crossing, bool extended)
int	LeftEdgeForBox (const TBOX &box, bool crossing, bool extended)
TabVector *	RightTabForBox (const TBOX &box, bool crossing, bool extended)
TabVector *	LeftTabForBox (const TBOX &box, bool crossing, bool extended)
bool	CommonWidth (int width)
WidthCallback	WidthCB ()
const ICOORD &	image_origin () const
Public Member Functions inherited from tesseract::AlignedBlob
	AlignedBlob (int gridsize, const ICOORD &bleft, const ICOORD &tright)
	~AlignedBlob () override
ScrollView *	DisplayTabs (const char *window_name, ScrollView *tab_win)
TabVector *	FindVerticalAlignment (AlignedBlobParams align_params, BLOBNBOX *bbox, int *vertical_x, int *vertical_y)
Public Member Functions inherited from tesseract::BlobGrid
	BlobGrid (int gridsize, const ICOORD &bleft, const ICOORD &tright)
	~BlobGrid () override
void	InsertBlobList (BLOBNBOX_LIST *blobs)
Public Member Functions inherited from tesseract::BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT >
	BBGrid ()
	BBGrid (int gridsize, const ICOORD &bleft, const ICOORD &tright)
	~BBGrid () override
void	Init (int gridsize, const ICOORD &bleft, const ICOORD &tright)
void	Clear ()
void	ClearGridData (void(*free_method)(BLOBNBOX *))
void	InsertBBox (bool h_spread, bool v_spread, BLOBNBOX *bbox)
void	InsertPixPtBBox (int left, int bottom, Image pix, BLOBNBOX *bbox)
void	RemoveBBox (BLOBNBOX *bbox)
bool	RectangleEmpty (const TBOX &rect)
IntGrid *	CountCellElements ()
ScrollView *	MakeWindow (int x, int y, const char *window_name)
void	DisplayBoxes (ScrollView *window)
void	AssertNoDuplicates ()
virtual void	HandleClick (int x, int y)
Public Member Functions inherited from tesseract::GridBase
	GridBase ()=default
	GridBase (int gridsize, const ICOORD &bleft, const ICOORD &tright)
virtual	~GridBase ()
void	Init (int gridsize, const ICOORD &bleft, const ICOORD &tright)
int	gridsize () const
int	gridwidth () const
int	gridheight () const
const ICOORD &	bleft () const
const ICOORD &	tright () const
void	GridCoords (int x, int y, int *grid_x, int *grid_y) const
void	ClipGridCoords (int *x, int *y) const

Additional Inherited Members
Static Public Member Functions inherited from tesseract::TabFind
static bool	DifferentSizes (int size1, int size2)
static bool	VeryDifferentSizes (int size1, int size2)
Static Public Member Functions inherited from tesseract::AlignedBlob
static bool	WithinTestRegion (int detail_level, int x, int y)
Protected Member Functions inherited from tesseract::TabFind
TabVector_LIST *	vectors ()
TabVector_LIST *	dead_vectors ()
bool	FindTabVectors (TabVector_LIST *hlines, BLOBNBOX_LIST *image_blobs, TO_BLOCK *block, int min_gutter_width, double tabfind_aligned_gap_fraction, ColPartitionGrid *part_grid, FCOORD *deskew, FCOORD *reskew)
void	DontFindTabVectors (BLOBNBOX_LIST *image_blobs, TO_BLOCK *block, FCOORD *deskew, FCOORD *reskew)
void	TidyBlobs (TO_BLOCK *block)
void	SetupTabSearch (int x, int y, int *min_key, int *max_key)
ScrollView *	DisplayTabVectors (ScrollView *tab_win)
ScrollView *	FindInitialTabVectors (BLOBNBOX_LIST *image_blobs, int min_gutter_width, double tabfind_aligned_gap_fraction, TO_BLOCK *block)
void	ResetForVerticalText (const FCOORD &rotate, const FCOORD &rerotate, TabVector_LIST *horizontal_lines, int *min_gutter_width)
void	Reset ()
void	ReflectInYAxis ()
Static Protected Member Functions inherited from tesseract::TabFind
static void	RotateBlobList (const FCOORD &rotation, BLOBNBOX_LIST *blobs)
Protected Attributes inherited from tesseract::TabFind
ICOORD	vertical_skew_
	Estimate of true vertical in this image. More...
int	resolution_
	Of source image in pixels per inch. More...
Protected Attributes inherited from tesseract::BBGrid< BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT >
BLOBNBOX_CLIST *	grid_
Protected Attributes inherited from tesseract::GridBase
int	gridsize_
int	gridwidth_
int	gridheight_
int	gridbuckets_
ICOORD	bleft_
ICOORD	tright_

Detailed Description

Definition at line 50 of file colfind.h.

Constructor & Destructor Documentation

ColumnFinder()

tesseract::ColumnFinder::ColumnFinder	(	int	gridsize,
		const ICOORD &	bleft,
		const ICOORD &	tright,
		int	resolution,
		bool	cjk_script,
		double	aligned_gap_fraction,
		TabVector_LIST *	vlines,
		TabVector_LIST *	hlines,
		int	vertical_x,
		int	vertical_y
	)

Definition at line 78 of file colfind.cpp.

    : TabFind(gridsize, bleft, tright, vlines, vertical_x, vertical_y, resolution)
    , cjk_script_(cjk_script)
    , min_gutter_width_(static_cast<int>(kMinGutterWidthGrid * gridsize))
    , mean_column_gap_(tright.x() - bleft.x())
    , tabfind_aligned_gap_fraction_(aligned_gap_fraction)
    , deskew_(0.0f, 0.0f)
    , reskew_(1.0f, 0.0f)
    , rotation_(1.0f, 0.0f)
    , rerotate_(1.0f, 0.0f)
    , text_rotation_(0.0f, 0.0f)
    , best_columns_(nullptr)
    , stroke_width_(nullptr)
    , part_grid_(gridsize, bleft, tright)
    , nontext_map_(nullptr)
    , projection_(resolution)
    , denorm_(nullptr)
    , equation_detect_(nullptr) {
  TabVector_IT h_it(&horizontal_lines_);
  h_it.add_list_after(hlines);
}

~ColumnFinder()

tesseract::ColumnFinder::~ColumnFinder ( )

override

Definition at line 102 of file colfind.cpp.

                            {
  for (auto set : column_sets_) {
    delete set;
  }
  delete[] best_columns_;
  delete stroke_width_;
#ifndef GRAPHICS_DISABLED
  delete input_blobs_win_;
#endif
  nontext_map_.destroy();
  while (denorm_ != nullptr) {
    DENORM *dead_denorm = denorm_;
    denorm_ = const_cast<DENORM *>(denorm_->predecessor());
    delete dead_denorm;
  }
 
  // The ColPartitions are destroyed automatically, but any boxes in
  // the noise_parts_ list are owned and need to be deleted explicitly.
  ColPartition_IT part_it(&noise_parts_);
  for (part_it.mark_cycle_pt(); !part_it.cycled_list(); part_it.forward()) {
    ColPartition *part = part_it.data();
    part->DeleteBoxes();
  }
  // Likewise any boxes in the good_parts_ list need to be deleted.
  // These are just the image parts. Text parts have already given their
  // boxes on to the TO_BLOCK, and have empty lists.
  part_it.set_to_list(&good_parts_);
  for (part_it.mark_cycle_pt(); !part_it.cycled_list(); part_it.forward()) {
    ColPartition *part = part_it.data();
    part->DeleteBoxes();
  }
  // Also, any blobs on the image_bblobs_ list need to have their cblobs
  // deleted. This only happens if there has been an early return from
  // FindColumns, as in a normal return, the blobs go into the grid and
  // end up in noise_parts_, good_parts_ or the output blocks.
  BLOBNBOX_IT bb_it(&image_bblobs_);
  for (bb_it.mark_cycle_pt(); !bb_it.cycled_list(); bb_it.forward()) {
    BLOBNBOX *bblob = bb_it.data();
    delete bblob->cblob();
  }
}

Member Function Documentation

CorrectOrientation()

void tesseract::ColumnFinder::CorrectOrientation	(	TO_BLOCK *	block,
		bool	vertical_text_lines,
		int	recognition_rotation
	)

Definition at line 202 of file colfind.cpp.

                                                                {
  const FCOORD anticlockwise90(0.0f, 1.0f);
  const FCOORD clockwise90(0.0f, -1.0f);
  const FCOORD rotation180(-1.0f, 0.0f);
  const FCOORD norotation(1.0f, 0.0f);
 
  text_rotation_ = norotation;
  // Rotate the page to make the text upright, as implied by
  // recognition_rotation.
  rotation_ = norotation;
  if (recognition_rotation == 1) {
    rotation_ = anticlockwise90;
  } else if (recognition_rotation == 2) {
    rotation_ = rotation180;
  } else if (recognition_rotation == 3) {
    rotation_ = clockwise90;
  }
  // We infer text writing direction to be vertical if there are several
  // vertical text lines detected, and horizontal if not. But if the page
  // orientation was determined to be 90 or 270 degrees, the true writing
  // direction is the opposite of what we inferred.
  if (recognition_rotation & 1) {
    vertical_text_lines = !vertical_text_lines;
  }
  // If we still believe the writing direction is vertical, we use the
  // convention of rotating the page ccw 90 degrees to make the text lines
  // horizontal, and mark the blobs for rotation cw 90 degrees for
  // classification so that the text order is correct after recognition.
  if (vertical_text_lines) {
    rotation_.rotate(anticlockwise90);
    text_rotation_.rotate(clockwise90);
  }
  // Set rerotate_ to the inverse of rotation_.
  rerotate_ = FCOORD(rotation_.x(), -rotation_.y());
  if (rotation_.x() != 1.0f || rotation_.y() != 0.0f) {
    // Rotate all the blobs and tab vectors.
    RotateBlobList(rotation_, &block->large_blobs);
    RotateBlobList(rotation_, &block->blobs);
    RotateBlobList(rotation_, &block->small_blobs);
    RotateBlobList(rotation_, &block->noise_blobs);
    TabFind::ResetForVerticalText(rotation_, rerotate_, &horizontal_lines_, &min_gutter_width_);
    part_grid_.Init(gridsize(), bleft(), tright());
    // Reset all blobs to initial state and filter by size.
    // Since they have rotated, the list they belong on could have changed.
    block->ReSetAndReFilterBlobs();
    SetBlockRuleEdges(block);
    stroke_width_->CorrectForRotation(rerotate_, &part_grid_);
  }
  if (textord_debug_tabfind) {
    tprintf("Vertical=%d, orientation=%d, final rotation=(%f, %f)+(%f,%f)\n", vertical_text_lines,
            recognition_rotation, rotation_.x(), rotation_.y(), text_rotation_.x(),
            text_rotation_.y());
  }
  // Setup the denormalization.
  ASSERT_HOST(denorm_ == nullptr);
  denorm_ = new DENORM;
  denorm_->SetupNormalization(nullptr, &rotation_, nullptr, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f);
}

denorm()

const DENORM * tesseract::ColumnFinder::denorm ( ) const

inline

Definition at line 67 of file colfind.h.

                               {
    return denorm_;
  }

FindBlocks()

int tesseract::ColumnFinder::FindBlocks	(	PageSegMode	pageseg_mode,
		Image	scaled_color,
		int	scaled_factor,
		TO_BLOCK *	block,
		Image	photo_mask_pix,
		Image	thresholds_pix,
		Image	grey_pix,
		DebugPixa *	pixa_debug,
		BLOCK_LIST *	blocks,
		BLOBNBOX_LIST *	diacritic_blobs,
		TO_BLOCK_LIST *	to_blocks
	)

Definition at line 286 of file colfind.cpp.

                                                                                       {
  photo_mask_pix |= nontext_map_;
  stroke_width_->FindLeaderPartitions(input_block, &part_grid_);
  stroke_width_->RemoveLineResidue(&big_parts_);
  FindInitialTabVectors(nullptr, min_gutter_width_, tabfind_aligned_gap_fraction_, input_block);
  SetBlockRuleEdges(input_block);
  stroke_width_->GradeBlobsIntoPartitions(pageseg_mode, rerotate_, input_block, nontext_map_,
                                          denorm_, cjk_script_, &projection_, diacritic_blobs,
                                          &part_grid_, &big_parts_);
  if (!PSM_SPARSE(pageseg_mode)) {
    ImageFind::FindImagePartitions(photo_mask_pix, rotation_, rerotate_, input_block, this,
                                   pixa_debug, &part_grid_, &big_parts_);
    ImageFind::TransferImagePartsToImageMask(rerotate_, &part_grid_, photo_mask_pix);
    ImageFind::FindImagePartitions(photo_mask_pix, rotation_, rerotate_, input_block, this,
                                   pixa_debug, &part_grid_, &big_parts_);
  }
  part_grid_.ReTypeBlobs(&image_bblobs_);
  TidyBlobs(input_block);
  Reset();
  // TODO(rays) need to properly handle big_parts_.
  ColPartition_IT p_it(&big_parts_);
  for (p_it.mark_cycle_pt(); !p_it.cycled_list(); p_it.forward()) {
    p_it.data()->DisownBoxesNoAssert();
  }
  big_parts_.clear();
  delete stroke_width_;
  stroke_width_ = nullptr;
  // Compute the edge offsets whether or not there is a grey_pix. It is done
  // here as the c_blobs haven't been touched by rotation or anything yet,
  // so no denorm is required, yet the text has been separated from image, so
  // no time is wasted running it on image blobs.
  input_block->ComputeEdgeOffsets(thresholds_pix, grey_pix);
 
  // A note about handling right-to-left scripts (Hebrew/Arabic):
  // The columns must be reversed and come out in right-to-left instead of
  // the normal left-to-right order. Because the left-to-right ordering
  // is implicit in many data structures, it is simpler to fool the algorithms
  // into thinking they are dealing with left-to-right text.
  // To do this, we reflect the needed data in the y-axis and then reflect
  // the blocks back after they have been created. This is a temporary
  // arrangement that is confined to this function only, so the reflection
  // is completely invisible in the output blocks.
  // The only objects reflected are:
  // The vertical separator lines that have already been found;
  // The bounding boxes of all BLOBNBOXES on all lists on the input_block
  // plus the image_bblobs. The outlines are not touched, since they are
  // not looked at.
  bool input_is_rtl = input_block->block->right_to_left();
  if (input_is_rtl) {
    // Reflect the vertical separator lines (member of TabFind).
    ReflectInYAxis();
    // Reflect the blob boxes.
    ReflectForRtl(input_block, &image_bblobs_);
    part_grid_.ReflectInYAxis();
  }
 
  if (!PSM_SPARSE(pageseg_mode)) {
    if (!PSM_COL_FIND_ENABLED(pageseg_mode)) {
      // No tab stops needed. Just the grid that FindTabVectors makes.
      DontFindTabVectors(&image_bblobs_, input_block, &deskew_, &reskew_);
    } else {
      SetBlockRuleEdges(input_block);
      // Find the tab stops, estimate skew, and deskew the tabs, blobs and
      // part_grid_.
      FindTabVectors(&horizontal_lines_, &image_bblobs_, input_block, min_gutter_width_,
                     tabfind_aligned_gap_fraction_, &part_grid_, &deskew_, &reskew_);
      // Add the deskew to the denorm_.
      auto *new_denorm = new DENORM;
      new_denorm->SetupNormalization(nullptr, &deskew_, denorm_, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
                                     0.0f);
      denorm_ = new_denorm;
    }
    SetBlockRuleEdges(input_block);
    part_grid_.SetTabStops(this);
 
    // Make the column_sets_.
    if (!MakeColumns(false)) {
      tprintf("Empty page!!\n");
      part_grid_.DeleteParts();
      return 0; // This is an empty page.
    }
 
    // Refill the grid using rectangular spreading, and get the benefit
    // of the completed tab vectors marking the rule edges of each blob.
    Clear();
#ifndef GRAPHICS_DISABLED
    if (textord_tabfind_show_reject_blobs) {
      ScrollView *rej_win = MakeWindow(500, 300, "Rejected blobs");
      input_block->plot_graded_blobs(rej_win);
    }
#endif // !GRAPHICS_DISABLED
    InsertBlobsToGrid(false, false, &image_bblobs_, this);
    InsertBlobsToGrid(true, true, &input_block->blobs, this);
 
    part_grid_.GridFindMargins(best_columns_);
    // Split and merge the partitions by looking at local neighbours.
    GridSplitPartitions();
    // Resolve unknown partitions by adding to an existing partition, fixing
    // the type, or declaring them noise.
    part_grid_.GridFindMargins(best_columns_);
    GridMergePartitions();
    // Insert any unused noise blobs that are close enough to an appropriate
    // partition.
    InsertRemainingNoise(input_block);
    // Add horizontal line separators as partitions.
    GridInsertHLinePartitions();
    GridInsertVLinePartitions();
    // Recompute margins based on a local neighbourhood search.
    part_grid_.GridFindMargins(best_columns_);
    SetPartitionTypes();
  }
#ifndef GRAPHICS_DISABLED
  if (textord_tabfind_show_initial_partitions) {
    ScrollView *part_win = MakeWindow(100, 300, "InitialPartitions");
    part_grid_.DisplayBoxes(part_win);
    DisplayTabVectors(part_win);
  }
#endif
  if (!PSM_SPARSE(pageseg_mode)) {
#ifndef DISABLED_LEGACY_ENGINE
    if (equation_detect_) {
      equation_detect_->FindEquationParts(&part_grid_, best_columns_);
    }
#endif
    if (textord_tabfind_find_tables) {
      TableFinder table_finder;
      table_finder.Init(gridsize(), bleft(), tright());
      table_finder.set_resolution(resolution_);
      table_finder.set_left_to_right_language(!input_block->block->right_to_left());
      // Copy cleaned partitions from part_grid_ to clean_part_grid_ and
      // insert dot-like noise into period_grid_
      table_finder.InsertCleanPartitions(&part_grid_, input_block);
      // Get Table Regions
      table_finder.LocateTables(&part_grid_, best_columns_, WidthCB(), reskew_);
    }
    GridRemoveUnderlinePartitions();
    part_grid_.DeleteUnknownParts(input_block);
 
    // Build the partitions into chains that belong in the same block and
    // refine into one-to-one links, then smooth the types within each chain.
    part_grid_.FindPartitionPartners();
    part_grid_.FindFigureCaptions();
    part_grid_.RefinePartitionPartners(true);
    SmoothPartnerRuns();
 
#ifndef GRAPHICS_DISABLED
    if (textord_tabfind_show_partitions) {
      ScrollView *window = MakeWindow(400, 300, "Partitions");
      if (window != nullptr) {
        part_grid_.DisplayBoxes(window);
        if (!textord_debug_printable) {
          DisplayTabVectors(window);
        }
        if (window != nullptr && textord_tabfind_show_partitions > 1) {
          window->AwaitEvent(SVET_DESTROY);
        }
      }
    }
#endif // !GRAPHICS_DISABLED
    part_grid_.AssertNoDuplicates();
  }
  // Ownership of the ColPartitions moves from part_sets_ to part_grid_ here,
  // and ownership of the BLOBNBOXes moves to the ColPartitions.
  // (They were previously owned by the block or the image_bblobs list.)
  ReleaseBlobsAndCleanupUnused(input_block);
  // Ownership of the ColPartitions moves from part_grid_ to good_parts_ and
  // noise_parts_ here. In text blocks, ownership of the BLOBNBOXes moves
  // from the ColPartitions to the output TO_BLOCK. In non-text, the
  // BLOBNBOXes stay with the ColPartitions and get deleted in the destructor.
  if (PSM_SPARSE(pageseg_mode)) {
    part_grid_.ExtractPartitionsAsBlocks(blocks, to_blocks);
  } else {
    TransformToBlocks(blocks, to_blocks);
  }
  if (textord_debug_tabfind) {
    tprintf("Found %d blocks, %d to_blocks\n", blocks->length(), to_blocks->length());
  }
 
#ifndef GRAPHICS_DISABLED
  if (textord_tabfind_show_blocks) {
    DisplayBlocks(blocks);
  }
#endif
  RotateAndReskewBlocks(input_is_rtl, to_blocks);
  int result = 0;
#ifndef GRAPHICS_DISABLED
  if (blocks_win_ != nullptr) {
    bool waiting = false;
    do {
      waiting = false;
      auto event = blocks_win_->AwaitEvent(SVET_ANY);
      if (event->type == SVET_INPUT && event->parameter != nullptr) {
        if (*event->parameter == 'd') {
          result = -1;
        } else {
          blocks->clear();
        }
      } else if (event->type == SVET_DESTROY) {
        blocks_win_ = nullptr;
      } else {
        waiting = true;
      }
    } while (waiting);
  }
#endif // !GRAPHICS_DISABLED
  return result;
}

GetDeskewVectors()

void tesseract::ColumnFinder::GetDeskewVectors	(	FCOORD *	deskew,
		FCOORD *	reskew
	)

Definition at line 498 of file colfind.cpp.

                                                                  {
  *reskew = reskew_;
  *deskew = reskew_;
  deskew->set_y(-deskew->y());
}

IsVerticallyAlignedText()

bool tesseract::ColumnFinder::IsVerticallyAlignedText	(	double	find_vertical_text_ratio,
		TO_BLOCK *	block,
		BLOBNBOX_CLIST *	osd_blobs
	)

Definition at line 186 of file colfind.cpp.

                                                                      {
  return stroke_width_->TestVerticalTextDirection(find_vertical_text_ratio, block, osd_blobs);
}

projection()

const TextlineProjection * tesseract::ColumnFinder::projection ( ) const

inline

Definition at line 70 of file colfind.h.

                                               {
    return &projection_;
  }

set_cjk_script()

void tesseract::ColumnFinder::set_cjk_script ( bool  is_cjk )

inline

Definition at line 73 of file colfind.h.

                                   {
    cjk_script_ = is_cjk;
  }

SetEquationDetect()

void tesseract::ColumnFinder::SetEquationDetect

(

EquationDetectBase *

detect

)

Definition at line 505 of file colfind.cpp.

                                                               {
  equation_detect_ = detect;
}

SetupAndFilterNoise()

void tesseract::ColumnFinder::SetupAndFilterNoise	(	PageSegMode	pageseg_mode,
		Image	photo_mask_pix,
		TO_BLOCK *	input_block
	)

Definition at line 151 of file colfind.cpp.

                                                              {
  part_grid_.Init(gridsize(), bleft(), tright());
  delete stroke_width_;
  stroke_width_ = new StrokeWidth(gridsize(), bleft(), tright());
  min_gutter_width_ = static_cast<int>(kMinGutterWidthGrid * gridsize());
  input_block->ReSetAndReFilterBlobs();
#ifndef GRAPHICS_DISABLED
  if (textord_tabfind_show_blocks) {
    input_blobs_win_ = MakeWindow(0, 0, "Filtered Input Blobs");
    input_block->plot_graded_blobs(input_blobs_win_);
  }
#endif // !GRAPHICS_DISABLED
  SetBlockRuleEdges(input_block);
  nontext_map_.destroy();
  // Run a preliminary strokewidth neighbour detection on the medium blobs.
  stroke_width_->SetNeighboursOnMediumBlobs(input_block);
  CCNonTextDetect nontext_detect(gridsize(), bleft(), tright());
  // Remove obvious noise and make the initial non-text map.
  nontext_map_ =
      nontext_detect.ComputeNonTextMask(textord_debug_tabfind, photo_mask_pix, input_block);
  stroke_width_->FindTextlineDirectionAndFixBrokenCJK(pageseg_mode, cjk_script_, input_block);
  // Clear the strokewidth grid ready for rotation or leader finding.
  stroke_width_->Clear();
}

---

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

• /media/home/debian/src/github/tesseract-ocr/tesseract/src/textord/colfind.h
• /media/home/debian/src/github/tesseract-ocr/tesseract/src/textord/colfind.cpp