Tesseract 3.02

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Macros | Variables
edgblob.cpp File Reference
`#include "mfcpch.h"`
`#include "scanedg.h"`
`#include "drawedg.h"`
`#include "edgloop.h"`
`#include "edgblob.h"`

Go to the source code of this file.

## Macros
#define | EXTERN

## Functions
extract_edges
Run the edge detector over the block and return a list of blobs.
void | extract_edges (Pix *pix, BLOCK *block)
outlines_to_blobs
Gather together outlines into blobs using the usual bucket sort.
void | outlines_to_blobs (BLOCK *block, ICOORD bleft, ICOORD tright, C_OUTLINE_LIST *outlines)
fill_buckets
Run the edge detector over the block and return a list of blobs.
void | fill_buckets (C_OUTLINE_LIST *outlines, OL_BUCKETS *buckets)
empty_buckets
Run the edge detector over the block and return a list of blobs.
void | empty_buckets (BLOCK *block, OL_BUCKETS *buckets)
capture_children
Find all neighbouring outlines that are children of this outline and either move them to the output list or declare this outline illegal and return FALSE.
BOOL8 | capture_children (OL_BUCKETS *buckets, C_BLOB_IT *reject_it, C_OUTLINE_IT *blob_it)

## Variables
EXTERN bool | edges_use_new_outline_complexity = FALSE
EXTERN int | edges_max_children_per_outline = 10
EXTERN int | edges_max_children_layers = 5
EXTERN bool | edges_debug = FALSE
EXTERN int | edges_children_per_grandchild = 10
EXTERN int | edges_children_count_limit = 45
EXTERN bool | edges_children_fix = FALSE
EXTERN int | edges_min_nonhole = 12
EXTERN int | edges_patharea_ratio = 40
EXTERN double | edges_childarea = 0.5
EXTERN double | edges_boxarea = 0.875

## Macro Definition Documentation

#define EXTERN

Definition at line 31 of file edgblob.cpp.

## Function Documentation

BOOL8 capture_children | ( | OL_BUCKETS * | buckets,
|  | C_BLOB_IT * | reject_it,
|  | C_OUTLINE_IT * | blob_it
| ) |  |

Definition at line 449 of file edgblob.cpp.

{
C_OUTLINE *outline; // master outline
inT32 child_count; // no of children
outline = blob_it->data();
if (edges_use_new_outline_complexity)
child_count = buckets->outline_complexity(outline,
edges_children_count_limit,
0);
else
child_count = buckets->count_children(outline,
edges_children_count_limit);
if (child_count > edges_children_count_limit)
return FALSE;
if (child_count > 0)
buckets->extract_children(outline, blob_it);
return TRUE;
}

void empty_buckets | ( | BLOCK * | block,
|  | OL_BUCKETS * | buckets
| ) |  |

Definition at line 403 of file edgblob.cpp.

{
BOOL8 good_blob; // healthy blob
C_OUTLINE_LIST outlines; // outlines in block
// iterator
C_OUTLINE_IT out_it = &outlines;
C_OUTLINE_IT bucket_it = buckets->start_scan();
C_OUTLINE_IT parent_it; // parent outline
C_BLOB *blob; // new blob
C_BLOB_IT good_blobs = block->blob_list();
C_BLOB_IT junk_blobs = block->reject_blobs();
while (!bucket_it.empty()) {
out_it.set_to_list(&outlines);
do {
parent_it = bucket_it; // find outermost
do {
bucket_it.forward();
} while (!bucket_it.at_first() &&
!(*parent_it.data() < *bucket_it.data()));
} while (!bucket_it.at_first());
// move to new list
out_it.add_after_then_move(parent_it.extract());
good_blob = capture_children(buckets, &junk_blobs, &out_it);
blob = new C_BLOB(&outlines);
if (good_blob)
good_blobs.add_after_then_move(blob);
else
junk_blobs.add_after_then_move(blob);
bucket_it.set_to_list(buckets->scan_next());
}
}

void extract_edges | ( | Pix * | pix,
|  | BLOCK * | block
| ) |  |

Definition at line 335 of file edgblob.cpp.

{ // block to scan
C_OUTLINE_LIST outlines; // outlines in block
C_OUTLINE_IT out_it = &outlines;
// TODO(rays) move the pix all the way down to the bottom.
IMAGE image;
image.FromPix(pix);
block_edges(&image, block, &out_it);
ICOORD bleft; // block box
ICOORD tright;
block->bounding_box(bleft, tright);
// make blobs
outlines_to_blobs(block, bleft, tright, &outlines);
}

void fill_buckets | ( | C_OUTLINE_LIST * | outlines,
|  | OL_BUCKETS * | buckets
| ) |  |

Definition at line 378 of file edgblob.cpp.

{
TBOX ol_box; // outline box
C_OUTLINE_IT out_it = outlines; // iterator
C_OUTLINE_IT bucket_it; // iterator in bucket
C_OUTLINE *outline; // current outline
for (out_it.mark_cycle_pt(); !out_it.cycled_list(); out_it.forward()) {
outline = out_it.extract(); // take off list
// get box
ol_box = outline->bounding_box();
bucket_it.set_to_list((*buckets) (ol_box.left(), ol_box.bottom()));
bucket_it.add_to_end(outline);
}
}

void outlines_to_blobs | ( | BLOCK * | block,
|  | ICOORD | bleft,
|  | ICOORD | tright,
|  | C_OUTLINE_LIST * | outlines
| ) |  |

Definition at line 359 of file edgblob.cpp.

{
// make buckets
OL_BUCKETS buckets(bleft, tright);
fill_buckets(outlines, &buckets);
empty_buckets(block, &buckets);
}

## Variable Documentation

EXTERN double edges_boxarea = 0.875

"Min area fraction of grandchild for box"

Definition at line 61 of file edgblob.cpp.

EXTERN double edges_childarea = 0.5

"Min area fraction of child outline"

Definition at line 59 of file edgblob.cpp.

EXTERN int edges_children_count_limit = 45

"Max holes allowed in blob"

Definition at line 51 of file edgblob.cpp.

EXTERN bool edges_children_fix = FALSE

"Remove boxy parents of char-like children"

Definition at line 53 of file edgblob.cpp.

EXTERN int edges_children_per_grandchild = 10

"Importance ratio for chucking outlines"

Definition at line 49 of file edgblob.cpp.

EXTERN bool edges_debug = FALSE

"turn on debugging for this module"

Definition at line 45 of file edgblob.cpp.

EXTERN int edges_max_children_layers = 5

"Max layers of nested children inside a character outline"

Definition at line 43 of file edgblob.cpp.

EXTERN int edges_max_children_per_outline = 10

"Max number of children inside a character outline"

Definition at line 41 of file edgblob.cpp.

EXTERN int edges_min_nonhole = 12

"Min pixels for potential char in box"

Definition at line 55 of file edgblob.cpp.

EXTERN int edges_patharea_ratio = 40

"Max lensq/area for acceptable child outline"

Definition at line 57 of file edgblob.cpp.

EXTERN bool edges_use_new_outline_complexity = FALSE

"Use the new outline complexity module"

Definition at line 39 of file edgblob.cpp.