Tesseract 3.02

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Public Member Functions
tesseract::ColPartitionSet Class Reference

`#include <colpartitionset.h>`

Inheritance diagram for tesseract::ColPartitionSet:

List of all members.

## Public Member Functions

| ColPartitionSet ()
| ColPartitionSet (ColPartition_LIST *partitions)
| ColPartitionSet (ColPartition *partition)
| ~ColPartitionSet ()
const TBOX & | bounding_box () const
bool | Empty ()
int | ColumnCount ()
ColPartition * | GetColumnByIndex (int index)
ColPartition * | ColumnContaining (int x, int y)
void | GetColumnBoxes (int y_bottom, int y_top, ColSegment_LIST *segments)
void | RelinquishParts ()
void | ImproveColumnCandidate (WidthCallback *cb, PartSetVector *src_sets)
void | AddToColumnSetsIfUnique (PartSetVector *column_sets, WidthCallback *cb)
bool | CompatibleColumns (bool debug, ColPartitionSet *other, WidthCallback *cb)
int | UnmatchedWidth (ColPartitionSet *part_set)
bool | LegalColumnCandidate ()
ColPartitionSet * | Copy (bool good_only)
void | DisplayColumnEdges (int y_bottom, int y_top, ScrollView *win)
ColumnSpanningType | SpanningType (int resolution, int left, int right, int y, int left_margin, int right_margin, int *first_col, int *last_col, int *first_spanned_col)
void | ChangeWorkColumns (const ICOORD &bleft, const ICOORD &tright, int resolution, ColPartition_LIST *used_parts, WorkingPartSet_LIST *working_set)
void | AccumulateColumnWidthsAndGaps (int *total_width, int *width_samples, int *total_gap, int *gap_samples)
void | Print ()
Public Member Functions inherited from ELIST_LINK
| ELIST_LINK ()
| ELIST_LINK (const ELIST_LINK &)
void | operator= (const ELIST_LINK &)

## Detailed Description

Definition at line 40 of file colpartitionset.h.

## Constructor & Destructor Documentation

tesseract::ColPartitionSet::ColPartitionSet | ( |  | ) |

inline

Definition at line 42 of file colpartitionset.h.

{
}

tesseract::ColPartitionSet::ColPartitionSet | ( | ColPartition_LIST * | partitions | ) |

explicit

Definition at line 33 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
it.add_list_after(partitions);
ComputeCoverage();
}

tesseract::ColPartitionSet::ColPartitionSet | ( | ColPartition * | partition | ) |

explicit

Definition at line 39 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
it.add_after_then_move(part);
ComputeCoverage();
}

tesseract::ColPartitionSet::~ColPartitionSet | ( |  | ) |

Definition at line 45 of file colpartitionset.cpp.

{
}

## Member Function Documentation

void tesseract::ColPartitionSet::AccumulateColumnWidthsAndGaps | ( | int * | total_width,
|  | int * | width_samples,
|  | int * | total_gap,
|  | int * | gap_samples
| ) |  |

Definition at line 557 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
*total_width += part->ColumnWidth();
++*width_samples;
if (!it.at_last()) {
ColPartition* next_part = it.data_relative(1);
int gap = part->KeyWidth(part->right_key(), next_part->left_key());
*total_gap += gap;
++*gap_samples;
}
}
}

void tesseract::ColPartitionSet::AddToColumnSetsIfUnique | ( | PartSetVector * | column_sets,
|  | WidthCallback * | cb
| ) |  |

Definition at line 164 of file colpartitionset.cpp.

{
bool debug = TabFind::WithinTestRegion(2, bounding_box_.left(),
bounding_box_.bottom());
if (debug) {
tprintf("Considering new column candidate:\n");
Print();
}
if (!LegalColumnCandidate()) {
if (debug) {
tprintf("Not a legal column candidate:\n");
Print();
}
delete this;
return;
}
for (int i = 0; i < column_sets->size(); ++i) {
ColPartitionSet* columns = column_sets->get(i);
// In ordering the column set candidates, good_coverage_ is king,
// followed by good_column_count_ and then bad_coverage_.
bool better = good_coverage_ > columns->good_coverage_;
if (good_coverage_ == columns->good_coverage_) {
better = good_column_count_ > columns->good_column_count_;
if (good_column_count_ == columns->good_column_count_) {
better = bad_coverage_ > columns->bad_coverage_;
}
}
if (better) {
// The new one is better so add it.
if (debug)
tprintf("Good one\n");
column_sets->insert(this, i);
return;
}
if (columns->CompatibleColumns(false, this, cb)) {
if (debug)
tprintf("Duplicate\n");
delete this;
return; // It is not unique.
}
}
if (debug)
tprintf("Added to end\n");
column_sets->push_back(this);
}

const TBOX& tesseract::ColPartitionSet::bounding_box | ( |  | ) | const

inline

Definition at line 50 of file colpartitionset.h.

{
return bounding_box_;
}

void tesseract::ColPartitionSet::ChangeWorkColumns | ( | const ICOORD & | bleft,
|  | const ICOORD & | tright,
|  | int | resolution,
|  | ColPartition_LIST * | used_parts,
|  | WorkingPartSet_LIST * | working_set
| ) |  |

Definition at line 485 of file colpartitionset.cpp.

{
// Move the input list to a temporary location so we can delete its elements
// as we add them to the output working_set.
WorkingPartSet_LIST work_src;
WorkingPartSet_IT src_it(&work_src);
src_it.add_list_after(working_set_list);
src_it.move_to_first();
WorkingPartSet_IT dest_it(working_set_list);
// Completed blocks and to_blocks are accumulated and given to the first new
// one whenever we keep a column, or at the end.
BLOCK_LIST completed_blocks;
TO_BLOCK_LIST to_blocks;
WorkingPartSet* first_new_set = NULL;
WorkingPartSet* working_set = NULL;
ColPartition_IT col_it(&parts_);
for (col_it.mark_cycle_pt(); !col_it.cycled_list(); col_it.forward()) {
ColPartition* column = col_it.data();
// Any existing column to the left of column is completed.
while (!src_it.empty() &&
((working_set = src_it.data())->column() == NULL ||
working_set->column()->right_key() <= column->left_key())) {
src_it.extract();
working_set->ExtractCompletedBlocks(bleft, tright, resolution,
used_parts, &completed_blocks,
&to_blocks);
delete working_set;
src_it.forward();
}
// Make a new between-column WorkingSet for before the current column.
working_set = new WorkingPartSet(NULL);
dest_it.add_after_then_move(working_set);
if (first_new_set == NULL)
first_new_set = working_set;
// A matching column gets to stay, and first_new_set gets all the
// completed_sets.
working_set = src_it.empty() ? NULL : src_it.data();
if (working_set != NULL &&
working_set->column()->MatchingColumns(*column)) {
working_set->set_column(column);
dest_it.add_after_then_move(src_it.extract());
src_it.forward();
first_new_set->InsertCompletedBlocks(&completed_blocks, &to_blocks);
first_new_set = NULL;
} else {
// Just make a new working set for the current column.
working_set = new WorkingPartSet(column);
dest_it.add_after_then_move(working_set);
}
}
// Complete any remaining src working sets.
while (!src_it.empty()) {
working_set = src_it.extract();
working_set->ExtractCompletedBlocks(bleft, tright, resolution,
used_parts, &completed_blocks,
&to_blocks);
delete working_set;
src_it.forward();
}
// Make a new between-column WorkingSet for after the last column.
working_set = new WorkingPartSet(NULL);
dest_it.add_after_then_move(working_set);
if (first_new_set == NULL)
first_new_set = working_set;
// The first_new_set now gets any accumulated completed_parts/blocks.
first_new_set->InsertCompletedBlocks(&completed_blocks, &to_blocks);
}

ColPartition * tesseract::ColPartitionSet::ColumnContaining | ( | int | x,
|  | int | y
| ) |  |

Definition at line 59 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
if (part->ColumnContains(x, y))
return part;
}
return NULL;
}

int tesseract::ColPartitionSet::ColumnCount | ( |  | ) |

inline

Definition at line 56 of file colpartitionset.h.

{
return parts_.length();
}

bool tesseract::ColPartitionSet::CompatibleColumns | ( | bool | debug,
|  | ColPartitionSet * | other,
|  | WidthCallback * | cb
| ) |  |

Definition at line 212 of file colpartitionset.cpp.

{
if (debug) {
tprintf("CompatibleColumns testing compatibility\n");
Print();
other->Print();
}
if (other->parts_.empty()) {
if (debug)
tprintf("CompatibleColumns true due to empty other\n");
return true;
}
ColPartition_IT it(&other->parts_);
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
if (part->blob_type() < BRT_UNKNOWN) {
if (debug) {
tprintf("CompatibleColumns ignoring image partition\n");
part->Print();
}
continue; // Image partitions are irrelevant to column compatibility.
}
int y = part->MidY();
int left = part->bounding_box().left();
int right = part->bounding_box().right();
ColPartition* left_col = ColumnContaining(left, y);
ColPartition* right_col = ColumnContaining(right, y);
if (right_col == NULL || left_col == NULL) {
if (debug) {
tprintf("CompatibleColumns false due to partition edge outside\n");
part->Print();
}
return false; // A partition edge lies outside of all columns
}
if (right_col != left_col && cb->Run(right - left)) {
if (debug) {
tprintf("CompatibleColumns false due to good width in multiple cols\n");
part->Print();
}
return false; // Partition with a good width must be in a single column.
}
ColPartition_IT it2= it;
while (!it2.at_last()) {
it2.forward();
ColPartition* next_part = it2.data();
if (!BLOBNBOX::IsTextType(next_part->blob_type()))
continue; // Non-text partitions are irrelevant.
int next_left = next_part->bounding_box().left();
if (next_left == right) {
break; // They share the same edge, so one must be a pull-out.
}
// Search to see if right and next_left fall within a single column.
ColPartition* next_left_col = ColumnContaining(next_left, y);
if (right_col == next_left_col) {
// There is a column break in this column.
// This can be due to a figure caption within a column, a pull-out
// block, or a simple broken textline that remains to be merged:
// all allowed, or a change in column layout: not allowed.
// If both partitions are of good width, then it is likely
// a change in column layout, otherwise probably an allowed situation.
if (part->good_width() && next_part->good_width()) {
if (debug) {
int next_right = next_part->bounding_box().right();
tprintf("CompatibleColumns false due to 2 parts of good width\n");
tprintf("part1 %d-%d, part2 %d-%d\n",
left, right, next_left, next_right);
right_col->Print();
}
return false;
}
}
break;
}
}
if (debug)
tprintf("CompatibleColumns true!\n");
return true;
}

ColPartitionSet * tesseract::ColPartitionSet::Copy | ( | bool | good_only | ) |

Definition at line 343 of file colpartitionset.cpp.

{
ColPartition_LIST copy_parts;
ColPartition_IT src_it(&parts_);
ColPartition_IT dest_it(&copy_parts);
for (src_it.mark_cycle_pt(); !src_it.cycled_list(); src_it.forward()) {
ColPartition* part = src_it.data();
if (BLOBNBOX::IsTextType(part->blob_type()) &&
(!good_only || part->good_width() || part->good_column()))
dest_it.add_after_then_move(part->ShallowCopy());
}
if (dest_it.empty())
return NULL;
return new ColPartitionSet(&copy_parts);
}

void tesseract::ColPartitionSet::DisplayColumnEdges | ( | int | y_bottom,
|  | int | y_top,
|  | ScrollView * | win
| ) |  |

Definition at line 375 of file colpartitionset.cpp.

{
#ifndef GRAPHICS_DISABLED
ColPartition_IT it(&parts_);
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
win->Line(part->LeftAtY(y_top), y_top, part->LeftAtY(y_bottom), y_bottom);
win->Line(part->RightAtY(y_top), y_top, part->RightAtY(y_bottom), y_bottom);
}
#endif // GRAPHICS_DISABLED
}

bool tesseract::ColPartitionSet::Empty | ( |  | ) |

inline

Definition at line 53 of file colpartitionset.h.

{
return parts_.empty();
}

void tesseract::ColPartitionSet::GetColumnBoxes | ( | int | y_bottom,
|  | int | y_top,
|  | ColSegment_LIST * | segments
| ) |  |

Definition at line 359 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
ColSegment_IT col_it(segments);
col_it.move_to_last();
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
ICOORD bot_left(part->LeftAtY(y_top), y_bottom);
ICOORD top_right(part->RightAtY(y_bottom), y_top);
ColSegment *col_seg = new ColSegment();
col_seg->InsertBox(TBOX(bot_left, top_right));
col_it.add_after_then_move(col_seg);
}
}

ColPartition * tesseract::ColPartitionSet::GetColumnByIndex | ( | int | index | ) |

Definition at line 49 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
it.mark_cycle_pt();
for (int i = 0; i < index && !it.cycled_list(); ++i, it.forward());
if (it.cycled_list())
return NULL;
return it.data();
}

void tesseract::ColPartitionSet::ImproveColumnCandidate | ( | WidthCallback * | cb,
|  | PartSetVector * | src_sets
| ) |  |

Definition at line 79 of file colpartitionset.cpp.

{
int set_size = src_sets->size();
// Iterate over the provided column sets, as each one may have something
// to improve this.
for (int i = 0; i < set_size; ++i) {
ColPartitionSet* column_set = src_sets->get(i);
if (column_set == NULL)
continue;
// Iterate over the parts in this and column_set, adding bigger or
// new parts in column_set to this.
ColPartition_IT part_it(&parts_);
ASSERT_HOST(!part_it.empty());
int prev_right = MIN_INT32;
part_it.mark_cycle_pt();
ColPartition_IT col_it(&column_set->parts_);
for (col_it.mark_cycle_pt(); !col_it.cycled_list(); col_it.forward()) {
ColPartition* col_part = col_it.data();
if (col_part->blob_type() < BRT_UNKNOWN)
continue; // Ignore image partitions.
int col_left = col_part->left_key();
int col_right = col_part->right_key();
// Sync-up part_it (in this) so it matches the col_part in column_set.
ColPartition* part = part_it.data();
while (!part_it.at_last() && part->right_key() < col_left) {
prev_right = part->right_key();
part_it.forward();
part = part_it.data();
}
int part_left = part->left_key();
int part_right = part->right_key();
if (part_right < col_left || col_right < part_left) {
// There is no overlap so this is a new partition.
AddPartition(col_part->ShallowCopy(), &part_it);
continue;
}
// Check the edges of col_part to see if they can improve part.
bool part_width_ok = cb->Run(part->KeyWidth(part_left, part_right));
if (col_left < part_left && col_left > prev_right) {
// The left edge of the column is better and it doesn't overlap,
// so we can potentially expand it.
int col_box_left = col_part->BoxLeftKey();
bool tab_width_ok = cb->Run(part->KeyWidth(col_left, part_right));
bool box_width_ok = cb->Run(part->KeyWidth(col_box_left, part_right));
if (tab_width_ok || (!part_width_ok )) {
// The tab is leaving the good column metric at least as good as
// it was before, so use the tab.
part->CopyLeftTab(*col_part, false);
part->SetColumnGoodness(cb);
} else if (col_box_left < part_left &&
(box_width_ok || !part_width_ok)) {
// The box is leaving the good column metric at least as good as
// it was before, so use the box.
part->CopyLeftTab(*col_part, true);
part->SetColumnGoodness(cb);
}
part_left = part->left_key();
}
if (col_right > part_right &&
(part_it.at_last() ||
part_it.data_relative(1)->left_key() > col_right)) {
// The right edge is better, so we can possibly expand it.
int col_box_right = col_part->BoxRightKey();
bool tab_width_ok = cb->Run(part->KeyWidth(part_left, col_right));
bool box_width_ok = cb->Run(part->KeyWidth(part_left, col_box_right));
if (tab_width_ok || (!part_width_ok )) {
// The tab is leaving the good column metric at least as good as
// it was before, so use the tab.
part->CopyRightTab(*col_part, false);
part->SetColumnGoodness(cb);
} else if (col_box_right > part_right &&
(box_width_ok || !part_width_ok)) {
// The box is leaving the good column metric at least as good as
// it was before, so use the box.
part->CopyRightTab(*col_part, true);
part->SetColumnGoodness(cb);
}
}
}
}
ComputeCoverage();
}

bool tesseract::ColPartitionSet::LegalColumnCandidate | ( |  | ) |

Definition at line 320 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
if (it.empty())
return false;
bool any_text_parts = false;
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
if (BLOBNBOX::IsTextType(part->blob_type())) {
if (!part->IsLegal())
return false; // Individual partition is illegal.
any_text_parts = true;
}
if (!it.at_last()) {
ColPartition* next_part = it.data_relative(1);
if (next_part->left_key() < part->right_key()) {
return false;
}
}
}
return any_text_parts;
}

void tesseract::ColPartitionSet::Print | ( |  | ) |

Definition at line 576 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
tprintf("Partition set of %d parts, %d good, coverage=%d+%d"
" (%d,%d)->(%d,%d)\n",
it.length(), good_column_count_, good_coverage_, bad_coverage_,
bounding_box_.left(), bounding_box_.bottom(),
bounding_box_.right(), bounding_box_.top());
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
part->Print();
}
}

void tesseract::ColPartitionSet::RelinquishParts | ( |  | ) |

Definition at line 70 of file colpartitionset.cpp.

{
ColPartition_IT it(&parts_);
while (!it.empty()) {
it.extract();
it.forward();
}
}

ColumnSpanningType tesseract::ColPartitionSet::SpanningType | ( | int | resolution,
|  | int | left,
|  | int | right,
|  | int | y,
|  | int | left_margin,
|  | int | right_margin,
|  | int * | first_col,
|  | int * | last_col,
|  | int * | first_spanned_col
| ) |  |

Definition at line 394 of file colpartitionset.cpp.

{
*first_col = -1;
*last_col = -1;
*first_spanned_col = -1;
int margin_columns = 0;
ColPartition_IT it(&parts_);
int col_index = 1;
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward(), col_index += 2) {
ColPartition* part = it.data();
if (part->ColumnContains(left, y)) {
// In the default case, first_col is set, but columns_spanned remains
// zero, so first_col will get reset in the first column genuinely
// spanned, but we can tell the difference from a noise partition
// that touches no column.
*first_col = col_index;
if (part->ColumnContains(right, y)) {
// Both within a single column.
*last_col = col_index;
return CST_FLOWING;
}
if (left_margin <= part->LeftAtY(y)) {
// It completely spans this column.
*first_spanned_col = col_index;
margin_columns = 1;
}
} else if (part->ColumnContains(right, y)) {
if (*first_col < 0) {
// It started in-between.
*first_col = col_index - 1;
}
if (right_margin >= part->RightAtY(y)) {
// It completely spans this column.
if (margin_columns == 0)
*first_spanned_col = col_index;
++margin_columns;
}
*last_col = col_index;
break;
} else if (left < part->LeftAtY(y) && right > part->RightAtY(y)) {
// Neither left nor right are contained within, so it spans this
// column.
if (*first_col < 0) {
// It started in between the previous column and the current column.
*first_col = col_index - 1;
}
if (margin_columns == 0)
*first_spanned_col = col_index;
*last_col = col_index;
} else if (right < part->LeftAtY(y)) {
// We have gone past the end.
*last_col = col_index - 1;
if (*first_col < 0) {
// It must lie completely between columns =>noise.
*first_col = col_index - 1;
}
break;
}
}
if (*first_col < 0)
*first_col = col_index - 1; // The last in-between.
if (*last_col < 0)
*last_col = col_index - 1; // The last in-between.
ASSERT_HOST(*first_col >= 0 && *last_col >= 0);
ASSERT_HOST(*first_col <= *last_col);
if (*first_col == *last_col && right - left < kMinColumnWidth * resolution) {
// Neither end was in a column, and it didn't span any, so it lies
// entirely between columns, therefore noise.
return CST_NOISE;
} else if (margin_columns <= 1) {
// An exception for headings that stick outside of single-column text.
if (margin_columns == 1 && parts_.singleton()) {
return CST_HEADING;
}
// It is a pullout, as left and right were not in the same column, but
// it doesn't go to the edge of its start and end.
return CST_PULLOUT;
}
// Its margins went to the edges of first and last columns => heading.
return CST_HEADING;
}

int tesseract::ColPartitionSet::UnmatchedWidth | ( | ColPartitionSet * | part_set | ) |

Definition at line 295 of file colpartitionset.cpp.

{
int total_width = 0;
ColPartition_IT it(&part_set->parts_);
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
ColPartition* part = it.data();
if (!BLOBNBOX::IsTextType(part->blob_type())) {
continue; // Non-text partitions are irrelevant to column compatibility.
}
int y = part->MidY();
BLOBNBOX_C_IT box_it(part->boxes());
for (box_it.mark_cycle_pt(); !box_it.cycled_list(); box_it.forward()) {
const TBOX& box = it.data()->bounding_box();
// Assume that the whole blob is outside any column iff its x-middle
// is outside.
int x = (box.left() + box.right()) / 2;
ColPartition* col = ColumnContaining(x, y);
if (col == NULL)
total_width += box.width();
}
}
return total_width;
}

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

- /mnt/data/src/tesseract-ocr/textord/colpartitionset.h
- /mnt/data/src/tesseract-ocr/textord/colpartitionset.cpp