#include <tabvector.h>

Inheritance diagram for tesseract::TabVector:

Public Member Functions
	TabVector ()=default

	~TabVector ()=default

	TabVector (const TabVector &src, TabAlignment alignment, const ICOORD &vertical_skew, BLOBNBOX *blob)

TabVector *	ShallowCopy () const

const ICOORD &	startpt () const

const ICOORD &	endpt () const

int	extended_ymax () const

int	extended_ymin () const

int	sort_key () const

int	mean_width () const

void	set_top_constraints (TabConstraint_LIST *constraints)

void	set_bottom_constraints (TabConstraint_LIST *constraints)

TabVector_CLIST *	partners ()

void	set_startpt (const ICOORD &start)

void	set_endpt (const ICOORD &end)

bool	intersects_other_lines () const

void	set_intersects_other_lines (bool value)

int	XAtY (int y) const

int	VOverlap (const TabVector &other) const

int	VOverlap (int top_y, int bottom_y) const

int	ExtendedOverlap (int top_y, int bottom_y) const

bool	IsLeftTab () const

bool	IsRightTab () const

bool	IsSeparator () const

bool	IsCenterTab () const

bool	IsRagged () const

bool	IsLeftOf (const TabVector &other) const

bool	Partnerless ()

int	BoxCount ()

void	Freeze ()

void	XYFlip ()

void	ReflectInYAxis ()

void	ExtendToBox (BLOBNBOX *blob)

void	SetYStart (int start_y)

void	SetYEnd (int end_y)

void	Rotate (const FCOORD &rotation)

void	SetupConstraints ()

void	SetupPartnerConstraints ()

void	SetupPartnerConstraints (TabVector *partner)

void	ApplyConstraints ()

bool	SimilarTo (const ICOORD &vertical, const TabVector &other, BlobGrid *grid) const

void	MergeWith (const ICOORD &vertical, TabVector *other)

void	AddPartner (TabVector *partner)

bool	IsAPartner (const TabVector *other)

void	Print (const char *prefix)

void	Debug (const char *prefix)

void	Display (ScrollView *tab_win)

void	FitAndEvaluateIfNeeded (const ICOORD &vertical, TabFind *finder)

void	Evaluate (const ICOORD &vertical, TabFind *finder)

bool	Fit (ICOORD vertical, bool force_parallel)

TabVector *	VerticalTextlinePartner ()

TabVector *	GetSinglePartner ()

Public Member Functions inherited from ELIST2_LINK
	ELIST2_LINK ()

	ELIST2_LINK (const ELIST2_LINK &)

void	operator= (const ELIST2_LINK &)

Static Public Member Functions
static TabVector *	FitVector (TabAlignment alignment, ICOORD vertical, int extended_start_y, int extended_end_y, BLOBNBOX_CLIST good_points, int vertical_x, int *vertical_y)

static int	SortKey (const ICOORD &vertical, int x, int y)

static int	XAtY (const ICOORD &vertical, int sort_key, int y)

static int	SortVectorsByKey (const void v1, const void v2)

static void	MergeSimilarTabVectors (const ICOORD &vertical, TabVector_LIST vectors, BlobGrid grid)

Detailed Description

Definition at line 111 of file tabvector.h.

Constructor & Destructor Documentation

◆ TabVector() [1/2]

tesseract::TabVector::TabVector ( )

default

◆ ~TabVector()

tesseract::TabVector::~TabVector ( )

default

◆ TabVector() [2/2]

tesseract::TabVector::TabVector	(	const TabVector &	src,
		TabAlignment	alignment,
		const ICOORD &	vertical_skew,
		BLOBNBOX *	blob
	)

Definition at line 198 of file tabvector.cpp.

   : extended_ymin_(src.extended_ymin_), extended_ymax_(src.extended_ymax_),
     needs_refit_(true), needs_evaluation_(true),
     alignment_(alignment) {
   BLOBNBOX_C_IT it(&boxes_);
   it.add_to_end(blob);
   TBOX box = blob->bounding_box();
   if (IsLeftTab()) {
     startpt_ = box.botleft();
     endpt_ = box.topleft();
   } else {
     startpt_ = box.botright();
     endpt_ = box.topright();
   }
   sort_key_ = SortKey(vertical_skew,
                       (startpt_.x() + endpt_.x()) / 2,
                       (startpt_.y() + endpt_.y()) / 2);
   if (textord_debug_tabfind > 3)
     Print("Constructed a new tab vector:");
 }

Member Function Documentation

◆ AddPartner()

void tesseract::TabVector::AddPartner ( TabVector * partner )

Definition at line 484 of file tabvector.cpp.

                                              {
   if (IsSeparator() || partner->IsSeparator())
     return;
   TabVector_C_IT it(&partners_);
   if (!it.empty()) {
     it.move_to_last();
     if (it.data() == partner)
       return;
   }
   it.add_after_then_move(partner);
 }

◆ ApplyConstraints()

void tesseract::TabVector::ApplyConstraints ( )

Definition at line 345 of file tabvector.cpp.

                                  {
   if (top_constraints_ != nullptr)
     TabConstraint::ApplyConstraints(top_constraints_);
   if (bottom_constraints_ != nullptr)
     TabConstraint::ApplyConstraints(bottom_constraints_);
 }

◆ BoxCount()

int tesseract::TabVector::BoxCount ( )

inline

Definition at line 244 of file tabvector.h.

                  {
     return boxes_.length();
   }

◆ Debug()

void tesseract::TabVector::Debug ( const char * prefix )

Definition at line 527 of file tabvector.cpp.

                                         {
   Print(prefix);
   BLOBNBOX_C_IT it(&boxes_);
   for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
     BLOBNBOX* bbox = it.data();
     const TBOX& box = bbox->bounding_box();
     tprintf("Box at (%d,%d)->(%d,%d)\n",
             box.left(), box.bottom(), box.right(), box.top());
   }
 }

◆ Display()

void tesseract::TabVector::Display ( ScrollView * tab_win )

Definition at line 539 of file tabvector.cpp.

                                            {
 #ifndef GRAPHICS_DISABLED
   if (textord_debug_printable)
     tab_win->Pen(ScrollView::BLUE);
   else if (alignment_ == TA_LEFT_ALIGNED)
     tab_win->Pen(ScrollView::LIME_GREEN);
   else if (alignment_ == TA_LEFT_RAGGED)
     tab_win->Pen(ScrollView::DARK_GREEN);
   else if (alignment_ == TA_RIGHT_ALIGNED)
     tab_win->Pen(ScrollView::PINK);
   else if (alignment_ == TA_RIGHT_RAGGED)
     tab_win->Pen(ScrollView::CORAL);
   else
     tab_win->Pen(ScrollView::WHITE);
   tab_win->Line(startpt_.x(), startpt_.y(), endpt_.x(), endpt_.y());
   tab_win->Pen(ScrollView::GREY);
   tab_win->Line(startpt_.x(), startpt_.y(), startpt_.x(), extended_ymin_);
   tab_win->Line(endpt_.x(), extended_ymax_, endpt_.x(), endpt_.y());
   char score_buf[64];
   snprintf(score_buf, sizeof(score_buf), "%d", percent_score_);
   tab_win->TextAttributes("Times", 50, false, false, false);
   tab_win->Text(startpt_.x(), startpt_.y(), score_buf);
 #endif
 }

◆ endpt()

const ICOORD& tesseract::TabVector::endpt ( ) const

inline

Definition at line 148 of file tabvector.h.

                               {
     return endpt_;
   }

◆ Evaluate()

void tesseract::TabVector::Evaluate	(	const ICOORD &	vertical,
		TabFind *	finder
	)

Definition at line 579 of file tabvector.cpp.

                                                                 {
   bool debug = false;
   needs_evaluation_ = false;
   int length = endpt_.y() - startpt_.y();
   if (length == 0 || boxes_.empty()) {
     percent_score_ = 0;
     Print("Zero length in evaluate");
     return;
   }
   // Compute the mean box height.
   BLOBNBOX_C_IT it(&boxes_);
   int mean_height = 0;
   int height_count = 0;
   for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
     BLOBNBOX* bbox = it.data();
     const TBOX& box = bbox->bounding_box();
     int height = box.height();
     mean_height += height;
     ++height_count;
   }
   if (height_count > 0) mean_height /= height_count;
   int max_gutter = kGutterMultiple * mean_height;
   if (IsRagged()) {
     // Ragged edges face a tougher test in that the gap must always be within
     // the height of the blob.
     max_gutter = kGutterToNeighbourRatio * mean_height;
   }
 
   STATS gutters(0, max_gutter + 1);
   // Evaluate the boxes for their goodness, calculating the coverage as we go.
   // Remove boxes that are not good and shorten the list to the first and
   // last good boxes.
   int num_deleted_boxes = 0;
   bool text_on_image = false;
   int good_length = 0;
   const TBOX* prev_good_box = nullptr;
   for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
     BLOBNBOX* bbox = it.data();
     const TBOX& box = bbox->bounding_box();
     int mid_y = (box.top() + box.bottom()) / 2;
     if (TabFind::WithinTestRegion(2, XAtY(box.bottom()), box.bottom())) {
       if (!debug) {
         tprintf("After already deleting %d boxes, ", num_deleted_boxes);
         Print("Starting evaluation");
       }
       debug = true;
     }
     // A good box is one where the nearest neighbour on the inside is closer
     // than half the distance to the nearest neighbour on the outside
     // (of the putative column).
     bool left = IsLeftTab();
     int tab_x = XAtY(mid_y);
     int gutter_width;
     int neighbour_gap;
     finder->GutterWidthAndNeighbourGap(tab_x, mean_height, max_gutter, left,
                                        bbox, &gutter_width, &neighbour_gap);
     if (debug) {
       tprintf("Box (%d,%d)->(%d,%d) has gutter %d, ndist %d\n",
               box.left(), box.bottom(), box.right(), box.top(),
               gutter_width, neighbour_gap);
     }
     // Now we can make the test.
     if (neighbour_gap * kGutterToNeighbourRatio <= gutter_width) {
       // A good box contributes its height to the good_length.
       good_length += box.top() - box.bottom();
       gutters.add(gutter_width, 1);
       // Two good boxes together contribute the gap between them
       // to the good_length as well, as long as the gap is not
       // too big.
       if (prev_good_box != nullptr) {
         int vertical_gap = box.bottom() - prev_good_box->top();
         double size1 = sqrt(static_cast<double>(prev_good_box->area()));
         double size2 = sqrt(static_cast<double>(box.area()));
         if (vertical_gap < kMaxFillinMultiple * std::min(size1, size2))
           good_length += vertical_gap;
         if (debug) {
           tprintf("Box and prev good, gap=%d, target %g, goodlength=%d\n",
                   vertical_gap, kMaxFillinMultiple * std::min(size1, size2),
                   good_length);
         }
       } else {
         // Adjust the start to the first good box.
         SetYStart(box.bottom());
       }
       prev_good_box = &box;
       if (bbox->flow() == BTFT_TEXT_ON_IMAGE)
         text_on_image = true;
     } else {
       // Get rid of boxes that are not good.
       if (debug) {
         tprintf("Bad Box (%d,%d)->(%d,%d) with gutter %d, ndist %d\n",
                 box.left(), box.bottom(), box.right(), box.top(),
                 gutter_width, neighbour_gap);
       }
       it.extract();
       ++num_deleted_boxes;
     }
   }
   if (debug) {
     Print("Evaluating:");
   }
   // If there are any good boxes, do it again, except this time get rid of
   // boxes that have a gutter that is a small fraction of the mean gutter.
   // This filters out ends that run into a coincidental gap in the text.
   int search_top = endpt_.y();
   int search_bottom = startpt_.y();
   int median_gutter = IntCastRounded(gutters.median());
   if (gutters.get_total() > 0) {
     prev_good_box = nullptr;
     for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
       BLOBNBOX* bbox = it.data();
       const TBOX& box = bbox->bounding_box();
       int mid_y = (box.top() + box.bottom()) / 2;
       // A good box is one where the gutter width is at least some constant
       // fraction of the mean gutter width.
       bool left = IsLeftTab();
       int tab_x = XAtY(mid_y);
       int max_gutter = kGutterMultiple * mean_height;
       if (IsRagged()) {
         // Ragged edges face a tougher test in that the gap must always be
         // within the height of the blob.
         max_gutter = kGutterToNeighbourRatio * mean_height;
       }
       int gutter_width;
       int neighbour_gap;
       finder->GutterWidthAndNeighbourGap(tab_x, mean_height, max_gutter, left,
                                          bbox, &gutter_width, &neighbour_gap);
       // Now we can make the test.
       if (gutter_width >= median_gutter * kMinGutterFraction) {
         if (prev_good_box == nullptr) {
           // Adjust the start to the first good box.
           SetYStart(box.bottom());
           search_bottom = box.top();
         }
         prev_good_box = &box;
         search_top = box.bottom();
       } else {
         // Get rid of boxes that are not good.
         if (debug) {
           tprintf("Bad Box (%d,%d)->(%d,%d) with gutter %d, mean gutter %d\n",
                   box.left(), box.bottom(), box.right(), box.top(),
                   gutter_width, median_gutter);
         }
         it.extract();
         ++num_deleted_boxes;
       }
     }
   }
   // If there has been a good box, adjust the end.
   if (prev_good_box != nullptr) {
     SetYEnd(prev_good_box->top());
     // Compute the percentage of the vector that is occupied by good boxes.
     int length = endpt_.y() - startpt_.y();
     percent_score_ = 100 * good_length / length;
     if (num_deleted_boxes > 0) {
       needs_refit_ = true;
       FitAndEvaluateIfNeeded(vertical, finder);
       if (boxes_.empty())
         return;
     }
     // Test the gutter over the whole vector, instead of just at the boxes.
     int required_shift;
     if (search_bottom > search_top) {
       search_bottom = startpt_.y();
       search_top = endpt_.y();
     }
     double min_gutter_width = kLineCountReciprocal / boxes_.length();
     min_gutter_width += IsRagged() ? kMinRaggedGutter : kMinAlignedGutter;
     min_gutter_width *= mean_height;
     int max_gutter_width = IntCastRounded(min_gutter_width) + 1;
     if (median_gutter > max_gutter_width)
       max_gutter_width = median_gutter;
     int gutter_width = finder->GutterWidth(search_bottom, search_top, *this,
                                            text_on_image, max_gutter_width,
                                            &required_shift);
     if (gutter_width < min_gutter_width) {
       if (debug) {
         tprintf("Rejecting bad tab Vector with %d gutter vs %g min\n",
                 gutter_width, min_gutter_width);
       }
       boxes_.shallow_clear();
       percent_score_ = 0;
     } else if (debug) {
       tprintf("Final gutter %d, vs limit of %g, required shift = %d\n",
               gutter_width, min_gutter_width, required_shift);
     }
   } else {
     // There are no good boxes left, so score is 0.
     percent_score_ = 0;
   }
 
   if (debug) {
     Print("Evaluation complete:");
   }
 }

◆ extended_ymax()

int tesseract::TabVector::extended_ymax ( ) const

inline

Definition at line 151 of file tabvector.h.

                             {
     return extended_ymax_;
   }

◆ extended_ymin()

int tesseract::TabVector::extended_ymin ( ) const

inline

Definition at line 154 of file tabvector.h.

                             {
     return extended_ymin_;
   }

◆ ExtendedOverlap()

int tesseract::TabVector::ExtendedOverlap	(	int	top_y,
		int	bottom_y
	)		const

inline

Definition at line 207 of file tabvector.h.

                                                      {
     return std::min(top_y, extended_ymax_) - std::max(bottom_y, extended_ymin_);
   }

◆ ExtendToBox()

void tesseract::TabVector::ExtendToBox ( BLOBNBOX * blob )

Definition at line 238 of file tabvector.cpp.

                                               {
   TBOX new_box = new_blob->bounding_box();
   BLOBNBOX_C_IT it(&boxes_);
   if (!it.empty()) {
     BLOBNBOX* blob = it.data();
     TBOX box = blob->bounding_box();
     while (!it.at_last() && box.top() <= new_box.top()) {
       if (blob == new_blob)
         return;  // We have it already.
       it.forward();
       blob = it.data();
       box = blob->bounding_box();
     }
     if (box.top() >= new_box.top()) {
       it.add_before_stay_put(new_blob);
       needs_refit_ = true;
       return;
     }
   }
   needs_refit_ = true;
   it.add_after_stay_put(new_blob);
 }

◆ Fit()

bool tesseract::TabVector::Fit	(	ICOORD	vertical,
		bool	force_parallel
	)

Definition at line 780 of file tabvector.cpp.

                                                         {
   needs_refit_ = false;
   if (boxes_.empty()) {
     // Don't refit something with no boxes, as that only happens
     // in Evaluate, and we don't want to end up with a zero vector.
     if (!force_parallel)
       return false;
     // If we are forcing parallel, then we just need to set the sort_key_.
     ICOORD midpt = startpt_;
     midpt += endpt_;
     midpt /= 2;
     sort_key_ = SortKey(vertical, midpt.x(), midpt.y());
     return startpt_.y() != endpt_.y();
   }
   if (!force_parallel && !IsRagged()) {
     // Use a fitted line as the vertical.
     DetLineFit linepoints;
     BLOBNBOX_C_IT it(&boxes_);
     // Fit a line to all the boxes in the list.
     for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
       BLOBNBOX* bbox = it.data();
       const TBOX& box = bbox->bounding_box();
       int x1 = IsRightTab() ? box.right() : box.left();
       ICOORD boxpt(x1, box.bottom());
       linepoints.Add(boxpt);
       if (it.at_last()) {
         ICOORD top_pt(x1, box.top());
         linepoints.Add(top_pt);
       }
     }
     linepoints.Fit(&startpt_, &endpt_);
     if (startpt_.y() != endpt_.y()) {
       vertical = endpt_;
       vertical -= startpt_;
     }
   }
   int start_y = startpt_.y();
   int end_y = endpt_.y();
   sort_key_ = IsLeftTab() ? INT32_MAX : -INT32_MAX;
   BLOBNBOX_C_IT it(&boxes_);
   // Choose a line parallel to the vertical such that all boxes are on the
   // correct side of it.
   mean_width_ = 0;
   int width_count = 0;
   for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
     BLOBNBOX* bbox = it.data();
     const TBOX& box = bbox->bounding_box();
     mean_width_ += box.width();
     ++width_count;
     int x1 = IsRightTab() ? box.right() : box.left();
     // Test both the bottom and the top, as one will be more extreme, depending
     // on the direction of skew.
     int bottom_y = box.bottom();
     int top_y = box.top();
     int key = SortKey(vertical, x1, bottom_y);
     if (IsLeftTab() == (key < sort_key_)) {
       sort_key_ = key;
       startpt_ = ICOORD(x1, bottom_y);
     }
     key = SortKey(vertical, x1, top_y);
     if (IsLeftTab() == (key < sort_key_)) {
       sort_key_ = key;
       startpt_ = ICOORD(x1, top_y);
     }
     if (it.at_first())
       start_y = bottom_y;
     if (it.at_last())
       end_y = top_y;
   }
   if (width_count > 0) {
     mean_width_ = (mean_width_ + width_count - 1) / width_count;
   }
   endpt_ = startpt_ + vertical;
   needs_evaluation_ = true;
   if (start_y != end_y) {
     // Set the ends of the vector to fully include the first and last blobs.
     startpt_.set_x(XAtY(vertical, sort_key_, start_y));
     startpt_.set_y(start_y);
     endpt_.set_x(XAtY(vertical, sort_key_, end_y));
     endpt_.set_y(end_y);
     return true;
   }
   return false;
 }

◆ FitAndEvaluateIfNeeded()

void tesseract::TabVector::FitAndEvaluateIfNeeded	(	const ICOORD &	vertical,
		TabFind *	finder
	)

Definition at line 565 of file tabvector.cpp.

                                                         {
   if (needs_refit_)
     Fit(vertical, true);
   if (needs_evaluation_)
     Evaluate(vertical, finder);
 }

◆ FitVector()

TabVector * tesseract::TabVector::FitVector	(	TabAlignment	alignment,
		ICOORD	vertical,
		int	extended_start_y,
		int	extended_end_y,
		BLOBNBOX_CLIST *	good_points,
		int *	vertical_x,
		int *	vertical_y
	)

static

Definition at line 176 of file tabvector.cpp.

                                                                   {
   auto* vector = new TabVector(extended_start_y, extended_end_y,
                                     alignment, good_points);
   if (!vector->Fit(vertical, false)) {
     delete vector;
     return nullptr;
   }
   if (!vector->IsRagged()) {
     vertical = vector->endpt_ - vector->startpt_;
     int weight = vector->BoxCount();
     *vertical_x += vertical.x() * weight;
     *vertical_y += vertical.y() * weight;
   }
   return vector;
 }

◆ Freeze()

void tesseract::TabVector::Freeze ( )

inline

Definition at line 249 of file tabvector.h.

                 {
     boxes_.shallow_clear();
   }

◆ GetSinglePartner()

TabVector * tesseract::TabVector::GetSinglePartner ( )

Definition at line 866 of file tabvector.cpp.

                                        {
   if (!partners_.singleton())
     return nullptr;
   TabVector_C_IT partner_it(&partners_);
   TabVector* partner = partner_it.data();
   return partner;
 }

◆ intersects_other_lines()

bool tesseract::TabVector::intersects_other_lines ( ) const

inline

Definition at line 178 of file tabvector.h.

                                       {
     return intersects_other_lines_;
   }

◆ IsAPartner()

bool tesseract::TabVector::IsAPartner ( const TabVector * other )

Definition at line 497 of file tabvector.cpp.

                                                  {
   TabVector_C_IT it(&partners_);
   for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
     if (it.data() == other)
       return true;
   }
   return false;
 }

◆ IsCenterTab()

bool tesseract::TabVector::IsCenterTab ( ) const

inline

Definition at line 224 of file tabvector.h.

                            {
     return alignment_ == TA_CENTER_JUSTIFIED;
   }

◆ IsLeftOf()

bool tesseract::TabVector::IsLeftOf ( const TabVector & other ) const

inline

Definition at line 234 of file tabvector.h.

                                               {
     return sort_key_ < other.sort_key_;
   }

◆ IsLeftTab()

bool tesseract::TabVector::IsLeftTab ( ) const

inline

Definition at line 212 of file tabvector.h.

                          {
     return alignment_ == TA_LEFT_ALIGNED || alignment_ == TA_LEFT_RAGGED;
   }

◆ IsRagged()

bool tesseract::TabVector::IsRagged ( ) const

inline

Definition at line 228 of file tabvector.h.

                         {
     return alignment_ == TA_LEFT_RAGGED || alignment_ == TA_RIGHT_RAGGED;
   }

◆ IsRightTab()

bool tesseract::TabVector::IsRightTab ( ) const

inline

Definition at line 216 of file tabvector.h.

                           {
     return alignment_ == TA_RIGHT_ALIGNED || alignment_ == TA_RIGHT_RAGGED;
   }

◆ IsSeparator()

bool tesseract::TabVector::IsSeparator ( ) const

inline

Definition at line 220 of file tabvector.h.

                            {
     return alignment_ == TA_SEPARATOR;
   }

◆ mean_width()

int tesseract::TabVector::mean_width ( ) const

inline

Definition at line 160 of file tabvector.h.

                          {
     return mean_width_;
   }

◆ MergeSimilarTabVectors()

void tesseract::TabVector::MergeSimilarTabVectors	(	const ICOORD &	vertical,
		TabVector_LIST *	vectors,
		BlobGrid *	grid
	)

static

Definition at line 353 of file tabvector.cpp.

                                                        {
   TabVector_IT it1(vectors);
   for (it1.mark_cycle_pt(); !it1.cycled_list(); it1.forward()) {
     TabVector* v1 = it1.data();
     TabVector_IT it2(it1);
     for (it2.forward(); !it2.at_first(); it2.forward()) {
       TabVector* v2 = it2.data();
       if (v2->SimilarTo(vertical, *v1, grid)) {
         // Merge into the forward one, in case the combined vector now
         // overlaps one in between.
         if (textord_debug_tabfind) {
           v2->Print("Merging");
           v1->Print("by deleting");
         }
         v2->MergeWith(vertical, it1.extract());
         if (textord_debug_tabfind) {
           v2->Print("Producing");
         }
         ICOORD merged_vector = v2->endpt();
         merged_vector -= v2->startpt();
         if (textord_debug_tabfind && abs(merged_vector.x()) > 100) {
           v2->Print("Garbage result of merge?");
         }
         break;
       }
     }
   }
 }

◆ MergeWith()

void tesseract::TabVector::MergeWith	(	const ICOORD &	vertical,
		TabVector *	other
	)

Definition at line 450 of file tabvector.cpp.

                                                                   {
   extended_ymin_ = std::min(extended_ymin_, other->extended_ymin_);
   extended_ymax_ = std::max(extended_ymax_, other->extended_ymax_);
   if (other->IsRagged()) {
     alignment_ = other->alignment_;
   }
   // Merge sort the two lists of boxes.
   BLOBNBOX_C_IT it1(&boxes_);
   BLOBNBOX_C_IT it2(&other->boxes_);
   while (!it2.empty()) {
     BLOBNBOX* bbox2 = it2.extract();
     it2.forward();
     TBOX box2 = bbox2->bounding_box();
     BLOBNBOX* bbox1 = it1.data();
     TBOX box1 = bbox1->bounding_box();
     while (box1.bottom() < box2.bottom() && !it1.at_last()) {
       it1.forward();
       bbox1 = it1.data();
       box1 = bbox1->bounding_box();
     }
     if (box1.bottom() < box2.bottom()) {
       it1.add_to_end(bbox2);
     } else if (bbox1 != bbox2) {
       it1.add_before_stay_put(bbox2);
     }
   }
   Fit(vertical, true);
   other->Delete(this);
 }

◆ Partnerless()

bool tesseract::TabVector::Partnerless ( )

inline

Definition at line 239 of file tabvector.h.

                      {
     return partners_.empty();
   }

◆ partners()

TabVector_CLIST* tesseract::TabVector::partners ( )

inline

Definition at line 169 of file tabvector.h.

                               {
     return &partners_;
   }

◆ Print()

void tesseract::TabVector::Print ( const char * prefix )

Definition at line 517 of file tabvector.cpp.

                                         {
   tprintf(
       "%s %s (%d,%d)->(%d,%d) w=%d s=%d, sort key=%d, boxes=%d,"
       " partners=%d\n",
       prefix, kAlignmentNames[alignment_], startpt_.x(), startpt_.y(),
       endpt_.x(), endpt_.y(), mean_width_, percent_score_, sort_key_,
       boxes_.length(), partners_.length());
 }

◆ ReflectInYAxis()

void tesseract::TabVector::ReflectInYAxis ( )

inline

Definition at line 264 of file tabvector.h.

                         {
     startpt_.set_x(-startpt_.x());
     endpt_.set_x(-endpt_.x());
     sort_key_ = -sort_key_;
     if (alignment_ == TA_LEFT_ALIGNED)
       alignment_ = TA_RIGHT_ALIGNED;
     else if (alignment_ == TA_RIGHT_ALIGNED)
       alignment_ = TA_LEFT_ALIGNED;
     if (alignment_ == TA_LEFT_RAGGED)
       alignment_ = TA_RIGHT_RAGGED;
     else if (alignment_ == TA_RIGHT_RAGGED)
       alignment_ = TA_LEFT_RAGGED;
   }

◆ Rotate()

void tesseract::TabVector::Rotate ( const FCOORD & rotation )

Definition at line 273 of file tabvector.cpp.

                                              {
   startpt_.rotate(rotation);
   endpt_.rotate(rotation);
   int dx = endpt_.x() - startpt_.x();
   int dy = endpt_.y() - startpt_.y();
   if ((dy < 0 && abs(dy) > abs(dx)) || (dx < 0 && abs(dx) > abs(dy))) {
     // Need to flip start/end.
     ICOORD tmp = startpt_;
     startpt_ = endpt_;
     endpt_ = tmp;
   }
 }

◆ set_bottom_constraints()

void tesseract::TabVector::set_bottom_constraints ( TabConstraint_LIST * constraints )

inline

Definition at line 166 of file tabvector.h.

                                                                {
     bottom_constraints_ = constraints;
   }

◆ set_endpt()

void tesseract::TabVector::set_endpt ( const ICOORD & end )

inline

Definition at line 175 of file tabvector.h.

                                     {
     endpt_ = end;
   }

◆ set_intersects_other_lines()

void tesseract::TabVector::set_intersects_other_lines ( bool value )

inline

Definition at line 181 of file tabvector.h.

                                               {
     intersects_other_lines_ = value;
   }

◆ set_startpt()

void tesseract::TabVector::set_startpt ( const ICOORD & start )

inline

Definition at line 172 of file tabvector.h.

                                         {
     startpt_ = start;
   }

◆ set_top_constraints()

void tesseract::TabVector::set_top_constraints ( TabConstraint_LIST * constraints )

inline

Definition at line 163 of file tabvector.h.

                                                             {
     top_constraints_ = constraints;
   }

◆ SetupConstraints()

void tesseract::TabVector::SetupConstraints ( )

Definition at line 288 of file tabvector.cpp.

                                  {
   TabConstraint::CreateConstraint(this, false);
   TabConstraint::CreateConstraint(this, true);
 }

◆ SetupPartnerConstraints() [1/2]

void tesseract::TabVector::SetupPartnerConstraints ( )

Definition at line 294 of file tabvector.cpp.

                                         {
   // With the first and last partner, we want a common bottom and top,
   // respectively, and for each change of partner, we want a common
   // top of first with bottom of next.
   TabVector_C_IT it(&partners_);
   TabVector* prev_partner = nullptr;
   for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
     TabVector* partner = it.data();
     if (partner->top_constraints_ == nullptr ||
         partner->bottom_constraints_ == nullptr) {
       partner->Print("Impossible: has no constraints");
       Print("This vector has it as a partner");
       continue;
     }
     if (prev_partner == nullptr) {
       // This is the first partner, so common bottom.
       if (TabConstraint::CompatibleConstraints(bottom_constraints_,
                                                partner->bottom_constraints_))
         TabConstraint::MergeConstraints(bottom_constraints_,
                                         partner->bottom_constraints_);
     } else {
       // We need prev top to be common with partner bottom.
       if (TabConstraint::CompatibleConstraints(prev_partner->top_constraints_,
                                                partner->bottom_constraints_))
         TabConstraint::MergeConstraints(prev_partner->top_constraints_,
                                         partner->bottom_constraints_);
     }
     prev_partner = partner;
     if (it.at_last()) {
       // This is the last partner, so common top.
       if (TabConstraint::CompatibleConstraints(top_constraints_,
                                                partner->top_constraints_))
         TabConstraint::MergeConstraints(top_constraints_,
                                         partner->top_constraints_);
     }
   }
 }

◆ SetupPartnerConstraints() [2/2]

void tesseract::TabVector::SetupPartnerConstraints ( TabVector * partner )

Definition at line 333 of file tabvector.cpp.

                                                           {
   if (TabConstraint::CompatibleConstraints(bottom_constraints_,
                                            partner->bottom_constraints_))
     TabConstraint::MergeConstraints(bottom_constraints_,
                                     partner->bottom_constraints_);
   if (TabConstraint::CompatibleConstraints(top_constraints_,
                                            partner->top_constraints_))
     TabConstraint::MergeConstraints(top_constraints_,
                                     partner->top_constraints_);
 }

◆ SetYEnd()

void tesseract::TabVector::SetYEnd ( int end_y )

Definition at line 267 of file tabvector.cpp.

                                  {
   endpt_.set_x(XAtY(end_y));
   endpt_.set_y(end_y);
 }

◆ SetYStart()

void tesseract::TabVector::SetYStart ( int start_y )

Definition at line 262 of file tabvector.cpp.

                                      {
   startpt_.set_x(XAtY(start_y));
   startpt_.set_y(start_y);
 }

◆ ShallowCopy()

TabVector * tesseract::TabVector::ShallowCopy ( ) const

Definition at line 225 of file tabvector.cpp.

                                         {
   auto* copy = new TabVector();
   copy->startpt_ = startpt_;
   copy->endpt_ = endpt_;
   copy->alignment_ = alignment_;
   copy->extended_ymax_ = extended_ymax_;
   copy->extended_ymin_ = extended_ymin_;
   copy->intersects_other_lines_ = intersects_other_lines_;
   return copy;
 }

◆ SimilarTo()

bool tesseract::TabVector::SimilarTo	(	const ICOORD &	vertical,
		const TabVector &	other,
		BlobGrid *	grid
	)		const

Definition at line 386 of file tabvector.cpp.

                                                                         {
   if ((IsRightTab() && other.IsRightTab()) ||
       (IsLeftTab() && other.IsLeftTab())) {
     // If they don't overlap, at least in extensions, then there is no chance.
     if (ExtendedOverlap(other.extended_ymax_, other.extended_ymin_) < 0)
       return false;
     // A fast approximation to the scale factor of the sort_key_.
     int v_scale = abs(vertical.y());
     if (v_scale == 0)
       v_scale = 1;
     // If they are close enough, then OK.
     if (sort_key_ + kSimilarVectorDist * v_scale >= other.sort_key_ &&
         sort_key_ - kSimilarVectorDist * v_scale <= other.sort_key_)
       return true;
     // Ragged tabs get a bigger threshold.
     if (!IsRagged() || !other.IsRagged() ||
         sort_key_ + kSimilarRaggedDist * v_scale < other.sort_key_ ||
         sort_key_ - kSimilarRaggedDist * v_scale > other.sort_key_)
       return false;
     if (grid == nullptr) {
       // There is nothing else to test!
       return true;
     }
     // If there is nothing in the rectangle between the vector that is going to
     // move, and the place it is moving to, then they can be merged.
     // Setup a vertical search for any blob.
     const TabVector* mover = (IsRightTab() &&
        sort_key_ < other.sort_key_) ? this : &other;
     int top_y = mover->endpt_.y();
     int bottom_y = mover->startpt_.y();
     int left = std::min(mover->XAtY(top_y), mover->XAtY(bottom_y));
     int right = std::max(mover->XAtY(top_y), mover->XAtY(bottom_y));
     int shift = abs(sort_key_ - other.sort_key_) / v_scale;
     if (IsRightTab()) {
       right += shift;
     } else {
       left -= shift;
     }
 
     GridSearch<BLOBNBOX, BLOBNBOX_CLIST, BLOBNBOX_C_IT> vsearch(grid);
     vsearch.StartVerticalSearch(left, right, top_y);
     BLOBNBOX* blob;
     while ((blob = vsearch.NextVerticalSearch(true)) != nullptr) {
       const TBOX& box = blob->bounding_box();
       if (box.top() > bottom_y)
         return true;  // Nothing found.
       if (box.bottom() < top_y)
         continue;  // Doesn't overlap.
       int left_at_box = XAtY(box.bottom());
       int right_at_box = left_at_box;
       if (IsRightTab())
         right_at_box += shift;
       else
         left_at_box -= shift;
       if (std::min(right_at_box, static_cast<int>(box.right())) > std::max(left_at_box, static_cast<int>(box.left())))
         return false;
     }
     return true;  // Nothing found.
   }
   return false;
 }

◆ sort_key()

int tesseract::TabVector::sort_key ( ) const

inline

Definition at line 157 of file tabvector.h.

                        {
     return sort_key_;
   }

◆ SortKey()

static int tesseract::TabVector::SortKey	(	const ICOORD &	vertical,
		int	x,
		int	y
	)

inlinestatic

Definition at line 279 of file tabvector.h.

                                                            {
     ICOORD pt(x, y);
     return pt * vertical;
   }

◆ SortVectorsByKey()

static int tesseract::TabVector::SortVectorsByKey	(	const void *	v1,
		const void *	v2
	)

inlinestatic

Definition at line 293 of file tabvector.h.

                                                               {
     const TabVector* tv1 = *static_cast<const TabVector* const*>(v1);
     const TabVector* tv2 = *static_cast<const TabVector* const*>(v2);
     return tv1->sort_key_ - tv2->sort_key_;
   }

◆ startpt()

const ICOORD& tesseract::TabVector::startpt ( ) const

inline

Definition at line 145 of file tabvector.h.

                                 {
     return startpt_;
   }

◆ VerticalTextlinePartner()

TabVector * tesseract::TabVector::VerticalTextlinePartner ( )

Definition at line 876 of file tabvector.cpp.

                                               {
   if (!partners_.singleton())
     return nullptr;
   TabVector_C_IT partner_it(&partners_);
   TabVector* partner = partner_it.data();
   BLOBNBOX_C_IT box_it1(&boxes_);
   BLOBNBOX_C_IT box_it2(&partner->boxes_);
   // Count how many boxes are also in the other list.
   // At the same time, gather the mean width and median vertical gap.
   if (textord_debug_tabfind > 1) {
     Print("Testing for vertical text");
     partner->Print("           partner");
   }
   int num_matched = 0;
   int num_unmatched = 0;
   int total_widths = 0;
   int width = startpt().x() - partner->startpt().x();
   if (width < 0)
     width = -width;
   STATS gaps(0, width * 2);
   BLOBNBOX* prev_bbox = nullptr;
   box_it2.mark_cycle_pt();
   for (box_it1.mark_cycle_pt(); !box_it1.cycled_list(); box_it1.forward()) {
     BLOBNBOX* bbox = box_it1.data();
     TBOX box = bbox->bounding_box();
     if (prev_bbox != nullptr) {
       gaps.add(box.bottom() - prev_bbox->bounding_box().top(), 1);
     }
     while (!box_it2.cycled_list() && box_it2.data() != bbox &&
            box_it2.data()->bounding_box().bottom() < box.bottom()) {
       box_it2.forward();
     }
     if (!box_it2.cycled_list() && box_it2.data() == bbox &&
         bbox->region_type() >= BRT_UNKNOWN &&
         (prev_bbox == nullptr || prev_bbox->region_type() >= BRT_UNKNOWN))
       ++num_matched;
     else
       ++num_unmatched;
     total_widths += box.width();
     prev_bbox = bbox;
   }
   if (num_unmatched + num_matched == 0) return nullptr;
   double avg_width = total_widths * 1.0 / (num_unmatched + num_matched);
   double max_gap = textord_tabvector_vertical_gap_fraction * avg_width;
   int min_box_match = static_cast<int>((num_matched + num_unmatched) *
                                        textord_tabvector_vertical_box_ratio);
   bool is_vertical = (gaps.get_total() > 0 &&
                       num_matched >= min_box_match &&
                       gaps.median() <= max_gap);
   if (textord_debug_tabfind > 1) {
     tprintf("gaps=%d, matched=%d, unmatched=%d, min_match=%d "
             "median gap=%.2f, width=%.2f max_gap=%.2f Vertical=%s\n",
             gaps.get_total(), num_matched, num_unmatched, min_box_match,
             gaps.median(), avg_width, max_gap, is_vertical?"Yes":"No");
   }
   return (is_vertical) ? partner : nullptr;
 }

◆ VOverlap() [1/2]

int tesseract::TabVector::VOverlap ( const TabVector & other ) const

inline

Definition at line 198 of file tabvector.h.

                                              {
     return std::min(other.endpt_.y(), endpt_.y()) -
             std::max(other.startpt_.y(), startpt_.y());
   }

◆ VOverlap() [2/2]

int tesseract::TabVector::VOverlap	(	int	top_y,
		int	bottom_y
	)		const

inline

Definition at line 203 of file tabvector.h.

                                               {
     return std::min(top_y, static_cast<int>(endpt_.y())) - std::max(bottom_y, static_cast<int>(startpt_.y()));
   }

◆ XAtY() [1/2]

int tesseract::TabVector::XAtY ( int y ) const

inline

Definition at line 188 of file tabvector.h.

                         {
     int height = endpt_.y() - startpt_.y();
     if (height != 0)
       return (y - startpt_.y()) * (endpt_.x() - startpt_.x()) / height +
              startpt_.x();
     else
       return startpt_.x();
   }

◆ XAtY() [2/2]

static int tesseract::TabVector::XAtY	(	const ICOORD &	vertical,
		int	sort_key,
		int	y
	)

inlinestatic

Definition at line 285 of file tabvector.h.

                                                                {
     if (vertical.y() != 0)
       return (vertical.x() * y + sort_key) / vertical.y();
     else
       return sort_key;
   }

◆ XYFlip()

void tesseract::TabVector::XYFlip ( )

inline

Definition at line 254 of file tabvector.h.

                 {
     int x = startpt_.y();
     startpt_.set_y(startpt_.x());
     startpt_.set_x(x);
     x = endpt_.y();
     endpt_.set_y(endpt_.x());
     endpt_.set_x(x);
   }

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

src/textord/tabvector.h
src/textord/tabvector.cpp

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ TabVector() [1/2]

◆ ~TabVector()

◆ TabVector() [2/2]

Member Function Documentation

◆ AddPartner()

◆ ApplyConstraints()

◆ BoxCount()

◆ Debug()

◆ Display()

◆ endpt()

◆ Evaluate()

◆ extended_ymax()

◆ extended_ymin()

◆ ExtendedOverlap()

◆ ExtendToBox()

◆ Fit()

◆ FitAndEvaluateIfNeeded()

◆ FitVector()

◆ Freeze()

◆ GetSinglePartner()

◆ intersects_other_lines()

◆ IsAPartner()

◆ IsCenterTab()

◆ IsLeftOf()

◆ IsLeftTab()

◆ IsRagged()

◆ IsRightTab()

◆ IsSeparator()

◆ mean_width()

◆ MergeSimilarTabVectors()

◆ MergeWith()

◆ Partnerless()

◆ partners()

◆ Print()

◆ ReflectInYAxis()

◆ Rotate()

◆ set_bottom_constraints()

◆ set_endpt()

◆ set_intersects_other_lines()

◆ set_startpt()

◆ set_top_constraints()

◆ SetupConstraints()

◆ SetupPartnerConstraints() [1/2]

◆ SetupPartnerConstraints() [2/2]

◆ SetYEnd()

◆ SetYStart()

◆ ShallowCopy()

◆ SimilarTo()

◆ sort_key()

◆ SortKey()

◆ SortVectorsByKey()

◆ startpt()

◆ VerticalTextlinePartner()

◆ VOverlap() [1/2]

◆ VOverlap() [2/2]

◆ XAtY() [1/2]

◆ XAtY() [2/2]

◆ XYFlip()