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https://github.com/tesseract-ocr/tesseract.git
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a18816f839
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@441 d0cd1f9f-072b-0410-8dd7-cf729c803f20
119 lines
4.4 KiB
C++
119 lines
4.4 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 "blobs.h"
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#include "ratngs.h"
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#include "varable.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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double_VAR(speckle_large_max_size, 0.30, "Max large speckle size");
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double_VAR(speckle_small_penalty, 10.0, "Small speckle penalty");
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double_VAR(speckle_large_penalty, 10.0, "Large speckle penalty");
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double_VAR(speckle_small_certainty, -1.0, "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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/**
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* 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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*
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* Globals:
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* - #speckle_small_penalty rating for a small speckle
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* - #speckle_large_penalty rating penalty for a large speckle
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* - #speckle_small_certainty certainty for a small speckle
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*
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* @param Choices choices to add a speckle choice to
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*
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* @return New Choices list with null choice added to end.
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*
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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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void AddLargeSpeckleTo(BLOB_CHOICE_LIST *Choices) {
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assert(Choices != NULL);
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BLOB_CHOICE *blob_choice;
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BLOB_CHOICE_IT temp_it;
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temp_it.set_to_list(Choices);
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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->length() == 0) {
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blob_choice =
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new BLOB_CHOICE(0, speckle_small_certainty + speckle_large_penalty,
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speckle_small_certainty, -1, NULL);
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temp_it.add_to_end(blob_choice);
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return;
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}
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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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temp_it.move_to_last();
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blob_choice = temp_it.data(); // pick the worst choice
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temp_it.add_to_end(
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new BLOB_CHOICE(0, blob_choice->rating() + speckle_large_penalty,
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blob_choice->certainty(), -1, NULL));
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} /* AddLargeSpeckleTo */
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/*---------------------------------------------------------------------------*/
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/**
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* 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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*
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* Globals:
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* - #speckle_large_max_size largest allowed speckle
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*
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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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* @param Blob blob to test against speckle criteria
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* @param Row text row that blob is in
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*
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* @return TRUE if Blob is speckle, FALSE otherwise.
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*/
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BOOL8 LargeSpeckle(TBLOB *Blob, TEXTROW *Row) {
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double speckle_size;
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TPOINT TopLeft;
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TPOINT BottomRight;
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speckle_size = RowHeight (Row) * speckle_large_max_size;
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blob_bounding_box(Blob, &TopLeft, &BottomRight);
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if (TopLeft.y - BottomRight.y < speckle_size &&
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BottomRight.x - TopLeft.x < speckle_size)
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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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