mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-18 11:28:51 +08:00
570af48b8b
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@87 d0cd1f9f-072b-0410-8dd7-cf729c803f20
128 lines
4.9 KiB
C++
128 lines
4.9 KiB
C++
/******************************************************************************
|
|
** 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 "debug.h"
|
|
#include "blobs.h"
|
|
|
|
/**----------------------------------------------------------------------------
|
|
Global Data Definitions and Declarations
|
|
----------------------------------------------------------------------------**/
|
|
/* define control knobs for adjusting definition of speckle*/
|
|
make_float_var (MaxLargeSpeckleSize, 0.30, MakeMaxLargeSpeckleSize,
|
|
16, 2, SetMaxLargeSpeckleSize, "Max Large Speckle Size ...");
|
|
|
|
make_float_var (SmallSpecklePenalty, 10.0, MakeSmallSpecklePenalty,
|
|
16, 3, SetSmallSpecklePenalty, "Small Speckle Penalty ...");
|
|
|
|
make_float_var (LargeSpecklePenalty, 10.0, MakeLargeSpecklePenalty,
|
|
16, 4, SetLargeSpecklePenalty, "Large Speckle Penalty ...");
|
|
|
|
make_float_var (SmallSpeckleCertainty, -1.0, MakeSmallSpeckleCertainty,
|
|
16, 5, SetSmallSpeckleCertainty,
|
|
"Small Speckle Certainty ...");
|
|
|
|
/**----------------------------------------------------------------------------
|
|
Public Code
|
|
----------------------------------------------------------------------------**/
|
|
/*---------------------------------------------------------------------------*/
|
|
LIST AddLargeSpeckleTo(LIST Choices) {
|
|
/*
|
|
** Parameters:
|
|
** Choices choices to add a speckle choice to
|
|
** Globals:
|
|
** SmallSpecklePenalty rating for a small speckle
|
|
** LargeSpecklePenalty rating penalty for a large speckle
|
|
** SmallSpeckleCertainty 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.
|
|
*/
|
|
LIST WorstChoice;
|
|
char empty_lengths[] = {0};
|
|
|
|
/* if there are no other choices, use the small speckle penalty plus
|
|
the large speckle penalty */
|
|
if (Choices == NIL)
|
|
return (append_choice (NIL, "", empty_lengths, SmallSpecklePenalty + LargeSpecklePenalty,
|
|
SmallSpeckleCertainty, -1));
|
|
|
|
/* if there are other choices, add a null choice that is slightly worse
|
|
than the worst choice so far */
|
|
WorstChoice = last (Choices);
|
|
return (append_choice (Choices, "", empty_lengths,
|
|
best_probability (WorstChoice) + LargeSpecklePenalty,
|
|
best_certainty (WorstChoice), -1));
|
|
|
|
} /* AddLargeSpeckleTo */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
void InitSpeckleVars() {
|
|
/*
|
|
** Parameters: none
|
|
** Globals: none
|
|
** Operation: Install the control variables needed for the speckle
|
|
** filters.
|
|
** Return: none
|
|
** Exceptions: none
|
|
** History: Mon Mar 11 12:04:59 1991, DSJ, Created.
|
|
*/
|
|
MakeMaxLargeSpeckleSize();
|
|
MakeSmallSpecklePenalty();
|
|
MakeLargeSpecklePenalty();
|
|
MakeSmallSpeckleCertainty();
|
|
} /* InitSpeckleVars */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
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.
|
|
*/
|
|
FLOAT32 SpeckleSize;
|
|
TPOINT TopLeft;
|
|
TPOINT BottomRight;
|
|
|
|
SpeckleSize = RowHeight (Row) * MaxLargeSpeckleSize;
|
|
blob_bounding_box(Blob, &TopLeft, &BottomRight);
|
|
|
|
if (TopLeft.y - BottomRight.y < SpeckleSize &&
|
|
BottomRight.x - TopLeft.x < SpeckleSize)
|
|
return (TRUE);
|
|
else
|
|
return (FALSE);
|
|
|
|
} /* LargeSpeckle */
|