blkocc.cpp File Reference

#include <cctype>
#include <cmath>
#include "errcode.h"
#include "drawtord.h"
#include "blkocc.h"
#include <tesseract/helpers.h>

Go to the source code of this file.

Functions
bool	test_underline (bool testing_on, C_BLOB *blob, int16_t baseline, int16_t xheight)

Variables
double	textord_underline_threshold = 0.5

Function Documentation

test_underline()

bool test_underline	(	bool	testing_on,
		C_BLOB *	blob,
		int16_t	baseline,
		int16_t	xheight
	)

test_underline

Check to see if the blob is an underline. Return true if it is.

Parameters

testing_on	drawing blob
blob	blob to test
baseline	coords of baseline
xheight	height of line

Definition at line 48 of file blkocc.cpp.

  {
  int16_t occ;
  int16_t blob_width;             //width of blob
  TBOX blob_box;                  //bounding box
  int32_t desc_occ;
  int32_t x_occ;
  int32_t asc_occ;
  STATS projection;
 
  blob_box = blob->bounding_box ();
  blob_width = blob->bounding_box ().width ();
  projection.set_range (blob_box.bottom (), blob_box.top () + 1);
  if (testing_on) {
    //              blob->plot(to_win,GOLDENROD,GOLDENROD);
    //              line_color_index(to_win,GOLDENROD);
    //              move2d(to_win,blob_box.left(),baseline);
    //              draw2d(to_win,blob_box.right(),baseline);
    //              move2d(to_win,blob_box.left(),baseline+xheight);
    //              draw2d(to_win,blob_box.right(),baseline+xheight);
    tprintf
      ("Testing underline on blob at (%d,%d)->(%d,%d), base=%d\nOccs:",
      blob->bounding_box ().left (), blob->bounding_box ().bottom (),
      blob->bounding_box ().right (), blob->bounding_box ().top (),
      baseline);
  }
  horizontal_cblob_projection(blob, &projection);
  desc_occ = 0;
  for (occ = blob_box.bottom (); occ < baseline; occ++)
    if (occ <= blob_box.top () && projection.pile_count (occ) > desc_occ)
                                 //max in region
      desc_occ = projection.pile_count (occ);
  x_occ = 0;
  for (occ = baseline; occ <= baseline + xheight; occ++)
    if (occ >= blob_box.bottom () && occ <= blob_box.top ()
    && projection.pile_count (occ) > x_occ)
                                 //max in region
      x_occ = projection.pile_count (occ);
  asc_occ = 0;
  for (occ = baseline + xheight + 1; occ <= blob_box.top (); occ++)
    if (occ >= blob_box.bottom () && projection.pile_count (occ) > asc_occ)
      asc_occ = projection.pile_count (occ);
  if (testing_on) {
    tprintf ("%d %d %d\n", desc_occ, x_occ, asc_occ);
  }
  if (desc_occ == 0 && x_occ == 0 && asc_occ == 0) {
    tprintf ("Bottom=%d, top=%d, base=%d, x=%d\n",
      blob_box.bottom (), blob_box.top (), baseline, xheight);
    projection.print();
  }
  if (desc_occ > x_occ + x_occ
    && desc_occ > blob_width * textord_underline_threshold)
    return true;                 //real underline
  return asc_occ > x_occ + x_occ &&
         asc_occ > blob_width * textord_underline_threshold;                 //overline
  //neither
}

Variable Documentation

textord_underline_threshold

double textord_underline_threshold = 0.5

"Fraction of width occupied"

Definition at line 33 of file blkocc.cpp.