tesseract/classify/speckle.cpp

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/******************************************************************************
** Filename: speckle.c
** Purpose: Routines used by classifier to filter out speckle.
** Author: Dan Johnson
** History: Mon Mar 11 10:06:14 1991, DSJ, Created.
**
** (c) Copyright Hewlett-Packard Company, 1988.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
******************************************************************************/
/**----------------------------------------------------------------------------
Include Files and Type Defines
----------------------------------------------------------------------------**/
#include "speckle.h"
#include "blobs.h"
#include "ratngs.h"
#include "varable.h"
/**----------------------------------------------------------------------------
Global Data Definitions and Declarations
----------------------------------------------------------------------------**/
/* define control knobs for adjusting definition of speckle*/
double_VAR(speckle_large_max_size, 0.30, "Max large speckle size");
double_VAR(speckle_small_penalty, 10.0, "Small speckle penalty");
double_VAR(speckle_large_penalty, 10.0, "Large speckle penalty");
double_VAR(speckle_small_certainty, -1.0, "Small speckle certainty");
/**----------------------------------------------------------------------------
Public Code
----------------------------------------------------------------------------**/
/*---------------------------------------------------------------------------*/
void AddLargeSpeckleTo(BLOB_CHOICE_LIST *Choices) {
/*
** Parameters:
** Choices choices to add a speckle choice to
** Globals:
** speckle_small_penalty rating for a small speckle
** speckle_large_penalty rating penalty for a large speckle
** speckle_small_certainty certainty for a small speckle
** Operation: This routine adds a null choice to Choices with a
** rating equal to the worst rating in Choices plus a pad.
** The certainty of the new choice is the same as the
** certainty of the worst choice in Choices. The new choice
** is added to the end of Choices.
** Return: New Choices list with null choice added to end.
** Exceptions: none
** History: Mon Mar 11 11:08:11 1991, DSJ, Created.
*/
assert(Choices != NULL);
BLOB_CHOICE *blob_choice;
BLOB_CHOICE_IT temp_it;
temp_it.set_to_list(Choices);
// If there are no other choices, use the small speckle penalty plus
// the large speckle penalty.
if (Choices->length() == 0) {
blob_choice =
new BLOB_CHOICE(0, speckle_small_certainty + speckle_large_penalty,
speckle_small_certainty, -1, NULL);
temp_it.add_to_end(blob_choice);
return;
}
// If there are other choices, add a null choice that is slightly worse
// than the worst choice so far.
temp_it.move_to_last();
blob_choice = temp_it.data(); // pick the worst choice
temp_it.add_to_end(
new BLOB_CHOICE(0, blob_choice->rating() + speckle_large_penalty,
blob_choice->certainty(), -1, NULL));
} /* AddLargeSpeckleTo */
/*---------------------------------------------------------------------------*/
BOOL8 LargeSpeckle(TBLOB *Blob, TEXTROW *Row) {
/*
** Parameters:
** Blob blob to test against speckle criteria
** Row text row that blob is in
** Globals:
** MaxLargeSpeckleSize largest allowed speckle
** Operation: This routine returns TRUE if both the width of height
** of Blob are less than the MaxLargeSpeckleSize.
** Return: TRUE if Blob is speckle, FALSE otherwise.
** Exceptions: none
** History: Mon Mar 11 10:06:49 1991, DSJ, Created.
*/
double speckle_size;
TPOINT TopLeft;
TPOINT BottomRight;
speckle_size = RowHeight (Row) * speckle_large_max_size;
blob_bounding_box(Blob, &TopLeft, &BottomRight);
if (TopLeft.y - BottomRight.y < speckle_size &&
BottomRight.x - TopLeft.x < speckle_size)
return (TRUE);
else
return (FALSE);
} /* LargeSpeckle */