mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-25 03:29:05 +08:00
4c6c58e6ea
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@158 d0cd1f9f-072b-0410-8dd7-cf729c803f20
196 lines
8.6 KiB
C
196 lines
8.6 KiB
C
/**********************************************************************
|
|
* File: oldbasel.h (Formerly oldbl.h)
|
|
* Description: A re-implementation of the old baseline algorithm.
|
|
* Author: Ray Smith
|
|
* Created: Wed Oct 6 09:41:48 BST 1993
|
|
*
|
|
* (C) Copyright 1993, Hewlett-Packard Ltd.
|
|
** 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.
|
|
*
|
|
**********************************************************************/
|
|
|
|
#ifndef OLDBASEL_H
|
|
#define OLDBASEL_H
|
|
|
|
#include "varable.h"
|
|
#include "blobbox.h"
|
|
#include "notdll.h"
|
|
extern BOOL_VAR_H (textord_really_old_xheight, FALSE,
|
|
"Use original wiseowl xheight");
|
|
extern BOOL_VAR_H (textord_oldbl_debug, FALSE,
|
|
"Debug old baseline generation");
|
|
extern BOOL_VAR_H (textord_debug_baselines, FALSE,
|
|
"Debug baseline generation");
|
|
extern BOOL_VAR_H (textord_oldbl_paradef, TRUE, "Use para default mechanism");
|
|
extern BOOL_VAR_H (textord_oldbl_split_splines, TRUE,
|
|
"Split stepped splines");
|
|
extern BOOL_VAR_H (textord_oldbl_merge_parts, TRUE,
|
|
"Merge suspect partitions");
|
|
extern BOOL_VAR_H (oldbl_xhfix, FALSE,
|
|
"Fix bug in modes threshold for xheights");
|
|
extern INT_VAR_H (oldbl_holed_losscount, 10,
|
|
"Max lost before fallback line used");
|
|
extern double_VAR_H (oldbl_dot_error_size, 1.26, "Max aspect ratio of a dot");
|
|
extern double_VAR_H (textord_oldbl_jumplimit, 0.15,
|
|
"X fraction for new partition");
|
|
void make_old_baselines( //make splines
|
|
TO_BLOCK *block, //block to do
|
|
BOOL8 testing_on //correct orientation
|
|
);
|
|
void correlate_lines( //cleanup lines
|
|
TO_BLOCK *block //block to do
|
|
);
|
|
void correlate_neighbours( //fix bad rows
|
|
TO_BLOCK *block, /*block rows are in */
|
|
TO_ROW **rows, /*rows of block */
|
|
int rowcount /*no of rows to do */
|
|
);
|
|
int correlate_with_stats( //fix xheights
|
|
TO_ROW **rows, /*rows of block */
|
|
int rowcount /*no of rows to do */
|
|
);
|
|
void find_textlines( //get baseline
|
|
TO_BLOCK *block, //block row is in
|
|
TO_ROW *row, //row to do
|
|
int degree, //required approximation
|
|
QSPLINE *spline //starting spline
|
|
);
|
|
int get_blob_coords( //get boxes
|
|
TO_ROW *row, //row to use
|
|
inT32 lineheight, //block level
|
|
TBOX *blobcoords, //ouput boxes
|
|
BOOL8 &holed_line, //lost a lot of blobs
|
|
int &outcount //no of real blobs
|
|
);
|
|
void make_first_baseline ( //initial approximation
|
|
TBOX blobcoords[], /*blob bounding boxes */
|
|
int blobcount, /*no of blobcoords */
|
|
int xcoords[], /*coords for spline */
|
|
int ycoords[], /*approximator */
|
|
QSPLINE * spline, /*initial spline */
|
|
QSPLINE * baseline, /*output spline */
|
|
float jumplimit /*guess half descenders */
|
|
);
|
|
void make_holed_baseline ( //initial approximation
|
|
TBOX blobcoords[], /*blob bounding boxes */
|
|
int blobcount, /*no of blobcoords */
|
|
QSPLINE * spline, /*initial spline */
|
|
QSPLINE * baseline, /*output spline */
|
|
float gradient //of line
|
|
);
|
|
int partition_line ( //partition blobs
|
|
TBOX blobcoords[], //bounding boxes
|
|
int blobcount, /*no of blobs on row */
|
|
int *numparts, /*number of partitions */
|
|
char partids[], /*partition no of each blob */
|
|
int partsizes[], /*no in each partition */
|
|
QSPLINE * spline, /*curve to fit to */
|
|
float jumplimit, /*allowed delta change */
|
|
float ydiffs[] /*diff from spline */
|
|
);
|
|
void merge_oldbl_parts ( //partition blobs
|
|
TBOX blobcoords[], //bounding boxes
|
|
int blobcount, /*no of blobs on row */
|
|
char partids[], /*partition no of each blob */
|
|
int partsizes[], /*no in each partition */
|
|
int biggestpart, //major partition
|
|
float jumplimit /*allowed delta change */
|
|
);
|
|
int get_ydiffs ( //evaluate differences
|
|
TBOX blobcoords[], //bounding boxes
|
|
int blobcount, /*no of blobs */
|
|
QSPLINE * spline, /*approximating spline */
|
|
float ydiffs[] /*output */
|
|
);
|
|
int choose_partition ( //select partition
|
|
register float diff, /*diff from spline */
|
|
float partdiffs[], /*diff on all parts */
|
|
int lastpart, /*last assigned partition */
|
|
float jumplimit, /*new part threshold */
|
|
int *partcount /*no of partitions */
|
|
);
|
|
int partition_coords ( //find relevant coords
|
|
TBOX blobcoords[], //bounding boxes
|
|
int blobcount, /*no of blobs in row */
|
|
char partids[], /*partition no of each blob */
|
|
int bestpart, /*best new partition */
|
|
int xcoords[], /*points to work on */
|
|
int ycoords[] /*points to work on */
|
|
);
|
|
int segment_spline ( //make xstarts
|
|
TBOX blobcoords[], //boundign boxes
|
|
int blobcount, /*no of blobs in row */
|
|
int xcoords[], /*points to work on */
|
|
int ycoords[], /*points to work on */
|
|
int degree, int pointcount, /*no of points */
|
|
int xstarts[] //result
|
|
);
|
|
BOOL8 split_stepped_spline ( //make xstarts
|
|
QSPLINE * baseline, //current shot
|
|
float jumplimit, //max step fuction
|
|
int xcoords[], /*points to work on */
|
|
int xstarts[], //result
|
|
int &segments //no of segments
|
|
);
|
|
void insert_spline_point ( //get descenders
|
|
int xstarts[], //starts to shuffle
|
|
int segment, //insertion pt
|
|
int coord1, //coords to add
|
|
int coord2, int &segments //total segments
|
|
);
|
|
void find_lesser_parts ( //get descenders
|
|
TO_ROW * row, //row to process
|
|
TBOX blobcoords[], //bounding boxes
|
|
int blobcount, /*no of blobs */
|
|
char partids[], /*partition of each blob */
|
|
int partsizes[], /*size of each part */
|
|
int partcount, /*no of partitions */
|
|
int bestpart /*biggest partition */
|
|
);
|
|
|
|
void old_first_xheight ( //the wiseowl way
|
|
TO_ROW * row, /*current row */
|
|
TBOX blobcoords[], /*blob bounding boxes */
|
|
int initialheight, //initial guess
|
|
int blobcount, /*blobs in blobcoords */
|
|
QSPLINE * baseline, /*established */
|
|
float jumplimit /*min ascender height */
|
|
);
|
|
|
|
void make_first_xheight ( //find xheight
|
|
TO_ROW * row, /*current row */
|
|
TBOX blobcoords[], /*blob bounding boxes */
|
|
int lineheight, //initial guess
|
|
int init_lineheight, //block level guess
|
|
int blobcount, /*blobs in blobcoords */
|
|
QSPLINE * baseline, /*established */
|
|
float jumplimit /*min ascender height */
|
|
);
|
|
|
|
int *make_height_array ( //get array of heights
|
|
TBOX blobcoords[], /*blob bounding boxes */
|
|
int blobcount, /*blobs in blobcoords */
|
|
QSPLINE * baseline /*established */
|
|
);
|
|
|
|
void find_top_modes ( //get modes
|
|
STATS * stats, //stats to hack
|
|
int statnum, //no of piles
|
|
int modelist[], int modenum //no of modes to get
|
|
);
|
|
|
|
void pick_x_height(TO_ROW * row, //row to do
|
|
int modelist[],
|
|
int lefts[], int rights[],
|
|
STATS * heightstat,
|
|
int mode_threshold);
|
|
#endif
|