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https://github.com/tesseract-ocr/tesseract.git
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425d593ebe
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk/trunk@2 d0cd1f9f-072b-0410-8dd7-cf729c803f20
127 lines
4.9 KiB
C++
127 lines
4.9 KiB
C++
/******************************************************************************
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** Filename: speckle.c
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** Purpose: Routines used by classifier to filter out speckle.
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** Author: Dan Johnson
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** History: Mon Mar 11 10:06:14 1991, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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******************************************************************************/
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/**----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------**/
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#include "speckle.h"
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#include "debug.h"
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#include "blobs.h"
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/**----------------------------------------------------------------------------
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Global Data Definitions and Declarations
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----------------------------------------------------------------------------**/
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/* define control knobs for adjusting definition of speckle*/
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make_float_var (MaxLargeSpeckleSize, 0.30, MakeMaxLargeSpeckleSize,
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16, 2, SetMaxLargeSpeckleSize, "Max Large Speckle Size ...");
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make_float_var (SmallSpecklePenalty, 10.0, MakeSmallSpecklePenalty,
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16, 3, SetSmallSpecklePenalty, "Small Speckle Penalty ...");
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make_float_var (LargeSpecklePenalty, 10.0, MakeLargeSpecklePenalty,
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16, 4, SetLargeSpecklePenalty, "Large Speckle Penalty ...");
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make_float_var (SmallSpeckleCertainty, -1.0, MakeSmallSpeckleCertainty,
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16, 5, SetSmallSpeckleCertainty,
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"Small Speckle Certainty ...");
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/**----------------------------------------------------------------------------
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Public Code
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----------------------------------------------------------------------------**/
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/*---------------------------------------------------------------------------*/
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LIST AddLargeSpeckleTo(LIST Choices) {
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/*
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** Parameters:
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** Choices choices to add a speckle choice to
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** Globals:
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** SmallSpecklePenalty rating for a small speckle
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** LargeSpecklePenalty rating penalty for a large speckle
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** SmallSpeckleCertainty certainty for a small speckle
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** Operation: This routine adds a null choice to Choices with a
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** rating equal to the worst rating in Choices plus a pad.
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** The certainty of the new choice is the same as the
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** certainty of the worst choice in Choices. The new choice
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** is added to the end of Choices.
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** Return: New Choices list with null choice added to end.
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** Exceptions: none
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** History: Mon Mar 11 11:08:11 1991, DSJ, Created.
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*/
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LIST WorstChoice;
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/* if there are no other choices, use the small speckle penalty plus
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the large speckle penalty */
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if (Choices == NIL)
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return (append_choice (NIL, "", SmallSpecklePenalty + LargeSpecklePenalty,
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SmallSpeckleCertainty, -1));
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/* if there are other choices, add a null choice that is slightly worse
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than the worst choice so far */
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WorstChoice = last (Choices);
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return (append_choice (Choices, "",
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best_probability (WorstChoice) + LargeSpecklePenalty,
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best_certainty (WorstChoice), -1));
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} /* AddLargeSpeckleTo */
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/*---------------------------------------------------------------------------*/
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void InitSpeckleVars() {
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/*
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** Parameters: none
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** Globals: none
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** Operation: Install the control variables needed for the speckle
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** filters.
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** Return: none
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** Exceptions: none
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** History: Mon Mar 11 12:04:59 1991, DSJ, Created.
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*/
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MakeMaxLargeSpeckleSize();
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MakeSmallSpecklePenalty();
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MakeLargeSpecklePenalty();
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MakeSmallSpeckleCertainty();
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} /* InitSpeckleVars */
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/*---------------------------------------------------------------------------*/
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BOOL8 LargeSpeckle(TBLOB *Blob, TEXTROW *Row) {
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/*
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** Parameters:
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** Blob blob to test against speckle criteria
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** Row text row that blob is in
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** Globals:
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** MaxLargeSpeckleSize largest allowed speckle
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** Operation: This routine returns TRUE if both the width of height
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** of Blob are less than the MaxLargeSpeckleSize.
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** Return: TRUE if Blob is speckle, FALSE otherwise.
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** Exceptions: none
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** History: Mon Mar 11 10:06:49 1991, DSJ, Created.
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*/
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FLOAT32 SpeckleSize;
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TPOINT TopLeft;
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TPOINT BottomRight;
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SpeckleSize = RowHeight (Row) * MaxLargeSpeckleSize;
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blob_bounding_box(Blob, &TopLeft, &BottomRight);
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if (TopLeft.y - BottomRight.y < SpeckleSize &&
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BottomRight.x - TopLeft.x < SpeckleSize)
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return (TRUE);
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else
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return (FALSE);
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} /* LargeSpeckle */
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