Tesseract  3.02
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
blobs.h File Reference
#include "clst.h"
#include "rect.h"
#include "vecfuncs.h"

Go to the source code of this file.

Classes

struct  WIDTH_RECORD
struct  TPOINT
struct  EDGEPT
struct  TESSLINE
struct  TBLOB
struct  TWERD

Macros

#define EDGEPTFLAGS   4 /*concavity,length etc. */
#define free_widths(w)   if (w) memfree (w)

Typedefs

typedef TPOINT VECTOR

Functions

 CLISTIZEH (EDGEPT)
int count_blobs (TBLOB *blobs)
void blob_origin (TBLOB *blob, TPOINT *origin)
WIDTH_RECORDblobs_widths (TBLOB *blobs)
bool divisible_blob (TBLOB *blob, bool italic_blob, TPOINT *location)
void divide_blobs (TBLOB *blob, TBLOB *other_blob, bool italic_blob, const TPOINT &location)

Macro Definition Documentation

#define EDGEPTFLAGS   4 /*concavity,length etc. */

Definition at line 45 of file blobs.h.

#define free_widths (   w)    if (w) memfree (w)

Definition at line 287 of file blobs.h.


Typedef Documentation

typedef TPOINT VECTOR

Definition at line 70 of file blobs.h.


Function Documentation

void blob_origin ( TBLOB blob,
TPOINT origin 
)

Definition at line 537 of file blobs.cpp.

{ /*return value */
TBOX bbox = blob->bounding_box();
*origin = (bbox.topleft() + bbox.botright()) / 2;
}
WIDTH_RECORD* blobs_widths ( TBLOB blobs)

Definition at line 549 of file blobs.cpp.

{ /*blob to compute on */
WIDTH_RECORD *width_record;
TPOINT topleft; /*bounding box */
TPOINT botright;
int i = 0;
int blob_end;
int num_blobs = count_blobs (blobs);
/* Get memory */
width_record = (WIDTH_RECORD *) memalloc (sizeof (int) * num_blobs * 2);
width_record->num_chars = num_blobs;
TBOX bbox = blobs->bounding_box();
width_record->widths[i++] = bbox.width();
/* First width */
blob_end = bbox.right();
for (TBLOB* blob = blobs->next; blob != NULL; blob = blob->next) {
TBOX curbox = blob->bounding_box();
width_record->widths[i++] = curbox.left() - blob_end;
width_record->widths[i++] = curbox.width();
blob_end = curbox.right();
}
return width_record;
}
CLISTIZEH ( EDGEPT  )
int count_blobs ( TBLOB blobs)

Definition at line 581 of file blobs.cpp.

{
int x = 0;
for (TBLOB* b = blobs; b != NULL; b = b->next)
x++;
return x;
}
void divide_blobs ( TBLOB blob,
TBLOB other_blob,
bool  italic_blob,
const TPOINT location 
)

Definition at line 645 of file blobs.cpp.

{
TPOINT vertical = italic_blob ? kDivisibleVerticalItalic
TESSLINE *outline1 = NULL;
TESSLINE *outline2 = NULL;
TESSLINE *outline = blob->outlines;
blob->outlines = NULL;
int location_prod = CROSS(location, vertical);
while (outline != NULL) {
TPOINT mid_pt(
static_cast<inT16>((outline->topleft.x + outline->botright.x) / 2),
static_cast<inT16>((outline->topleft.y + outline->botright.y) / 2));
int mid_prod = CROSS(mid_pt, vertical);
if (mid_prod < location_prod) {
// Outline is in left blob.
if (outline1)
outline1->next = outline;
else
blob->outlines = outline;
outline1 = outline;
} else {
// Outline is in right blob.
if (outline2)
outline2->next = outline;
else
other_blob->outlines = outline;
outline2 = outline;
}
outline = outline->next;
}
if (outline1)
outline1->next = NULL;
if (outline2)
outline2->next = NULL;
}
bool divisible_blob ( TBLOB blob,
bool  italic_blob,
TPOINT location 
)

Definition at line 596 of file blobs.cpp.

{
if (blob->outlines == NULL || blob->outlines->next == NULL)
return false; // Need at least 2 outlines for it to be possible.
int max_gap = 0;
TPOINT vertical = italic_blob ? kDivisibleVerticalItalic
for (TESSLINE* outline1 = blob->outlines; outline1 != NULL;
outline1 = outline1->next) {
if (outline1->is_hole)
continue; // Holes do not count as separable.
TPOINT mid_pt1(
static_cast<inT16>((outline1->topleft.x + outline1->botright.x) / 2),
static_cast<inT16>((outline1->topleft.y + outline1->botright.y) / 2));
int mid_prod1 = CROSS(mid_pt1, vertical);
int min_prod1, max_prod1;
outline1->MinMaxCrossProduct(vertical, &min_prod1, &max_prod1);
for (TESSLINE* outline2 = outline1->next; outline2 != NULL;
outline2 = outline2->next) {
if (outline2->is_hole)
continue; // Holes do not count as separable.
TPOINT mid_pt2(
static_cast<inT16>((outline2->topleft.x + outline2->botright.x) / 2),
static_cast<inT16>((outline2->topleft.y + outline2->botright.y) / 2));
int mid_prod2 = CROSS(mid_pt2, vertical);
int min_prod2, max_prod2;
outline2->MinMaxCrossProduct(vertical, &min_prod2, &max_prod2);
int mid_gap = abs(mid_prod2 - mid_prod1);
int overlap = MIN(max_prod1, max_prod2) - MAX(min_prod1, min_prod2);
if (mid_gap - overlap / 4 > max_gap) {
max_gap = mid_gap - overlap / 4;
*location = mid_pt1;
*location += mid_pt2;
*location /= 2;
}
}
}
// Use the y component of the vertical vector as an approximation to its
// length.
return max_gap > vertical.y;
}