mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-18 11:28:51 +08:00
425d593ebe
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk/trunk@2 d0cd1f9f-072b-0410-8dd7-cf729c803f20
133 lines
5.0 KiB
C++
133 lines
5.0 KiB
C++
/******************************************************************************
|
|
** Filename: normfeat.c
|
|
** Purpose: Definition of char normalization features.
|
|
** Author: Dan Johnson
|
|
** History: 12/14/90, 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 "normfeat.h"
|
|
#include "mfoutline.h"
|
|
#include "intfx.h"
|
|
|
|
#include "ocrfeatures.h" //Debug
|
|
#include <stdio.h> //Debug
|
|
#include "efio.h" //Debug
|
|
//#include "christydbg.h"
|
|
|
|
/**----------------------------------------------------------------------------
|
|
Global Data Definitions and Declarations
|
|
----------------------------------------------------------------------------**/
|
|
/**----------------------------------------------------------------------------
|
|
Public Code
|
|
----------------------------------------------------------------------------**/
|
|
/*---------------------------------------------------------------------------*/
|
|
FLOAT32 ActualOutlineLength(FEATURE Feature) {
|
|
/*
|
|
** Parameters:
|
|
** Feature normalization feature
|
|
** Globals: none
|
|
** Operation: This routine returns the length that the outline
|
|
** would have been if it were baseline normalized instead
|
|
** of character normalized.
|
|
** Return: Baseline normalized length of outline.
|
|
** Exceptions: none
|
|
** History: Thu Dec 20 14:50:57 1990, DSJ, Created.
|
|
*/
|
|
return (ParamOf (Feature, CharNormLength) * LENGTH_COMPRESSION);
|
|
|
|
} /* ActualOutlineLength */
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
FEATURE_SET ExtractCharNormFeatures(TBLOB *Blob, LINE_STATS *LineStats) {
|
|
/*
|
|
** Parameters:
|
|
** Blob blob to extract char norm feature from
|
|
** LineStats statistics on text row blob is in
|
|
** Globals: none
|
|
** Operation: Compute a feature whose parameters describe how a
|
|
** character will be affected by the character normalization
|
|
** algorithm. The feature parameters are:
|
|
** y position of center of mass in baseline coordinates
|
|
** total length of outlines in baseline coordinates
|
|
** divided by a scale factor
|
|
** radii of gyration about the center of mass in
|
|
** baseline coordinates
|
|
** Return: Character normalization feature for Blob.
|
|
** Exceptions: none
|
|
** History: Wed May 23 18:06:38 1990, DSJ, Created.
|
|
*/
|
|
FEATURE_SET FeatureSet;
|
|
FEATURE Feature;
|
|
FLOAT32 Scale;
|
|
FLOAT32 Baseline;
|
|
LIST Outlines;
|
|
INT_FEATURE_ARRAY blfeatures;
|
|
INT_FEATURE_ARRAY cnfeatures;
|
|
INT_FX_RESULT_STRUCT FXInfo;
|
|
|
|
/* allocate the feature and feature set - note that there is always one
|
|
and only one char normalization feature for any blob */
|
|
FeatureSet = NewFeatureSet (1);
|
|
Feature = NewFeature (&CharNormDesc);
|
|
AddFeature(FeatureSet, Feature);
|
|
|
|
/* compute the normalization statistics for this blob */
|
|
Outlines = ConvertBlob (Blob);
|
|
/*---------Debug--------------------------------------------------*
|
|
OFile = fopen ("f:/ims/debug/nfOutline.logCPP", "r");
|
|
if (OFile == NULL)
|
|
{
|
|
OFile = Efopen ("f:/ims/debug/nfOutline.logCPP", "w");
|
|
WriteOutlines(OFile, Outlines);
|
|
}
|
|
else
|
|
{
|
|
fclose (OFile);
|
|
OFile = Efopen ("f:/ims/debug/nfOutline.logCPP", "a");
|
|
}
|
|
WriteOutlines(OFile, Outlines);
|
|
fclose (OFile);
|
|
*--------------------------------------------------------------------*/
|
|
|
|
ExtractIntFeat(Blob, blfeatures, cnfeatures, &FXInfo);
|
|
Baseline = BaselineAt (LineStats, FXInfo.Xmean);
|
|
Scale = ComputeScaleFactor (LineStats);
|
|
ParamOf (Feature, CharNormY) = (FXInfo.Ymean - Baseline) * Scale;
|
|
ParamOf (Feature, CharNormLength) =
|
|
FXInfo.Length * Scale / LENGTH_COMPRESSION;
|
|
ParamOf (Feature, CharNormRx) = FXInfo.Rx * Scale;
|
|
ParamOf (Feature, CharNormRy) = FXInfo.Ry * Scale;
|
|
|
|
/*---------Debug--------------------------------------------------*
|
|
File = fopen ("f:/ims/debug/nfFeatSet.logCPP", "r");
|
|
if (File == NULL)
|
|
{
|
|
File = Efopen ("f:/ims/debug/nfFeatSet.logCPP", "w");
|
|
WriteFeatureSet(File, FeatureSet);
|
|
}
|
|
else
|
|
{
|
|
fclose (File);
|
|
File = Efopen ("f:/ims/debug/nfFeatSet.logCPP", "a");
|
|
}
|
|
WriteFeatureSet(File, FeatureSet);
|
|
fclose (File);
|
|
*--------------------------------------------------------------------*/
|
|
FreeOutlines(Outlines);
|
|
return (FeatureSet);
|
|
} /* ExtractCharNormFeatures */
|