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425d593ebe
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk/trunk@2 d0cd1f9f-072b-0410-8dd7-cf729c803f20
149 lines
5.5 KiB
C
149 lines
5.5 KiB
C
/* -*-C-*-
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********************************************************************************
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*
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* File: outlines.h (Formerly outlines.h)
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* Description: Combinatorial Splitter
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* Author: Mark Seaman, OCR Technology
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* Created: Thu Jul 27 11:27:55 1989
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* Modified: Wed May 15 17:28:47 1991 (Mark Seaman) marks@hpgrlt
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* Language: C
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* Package: N/A
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* Status: Experimental (Do Not Distribute)
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*
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* (c) Copyright 1989, Hewlett-Packard Company.
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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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#ifndef OUTLINES_H
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#define OUTLINES_H
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#include "blobs.h"
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#include "chop.h"
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#include <math.h>
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/*----------------------------------------------------------------------
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C o n s t a n t s
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----------------------------------------------------------------------*/
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#define LARGE_DISTANCE 100000 /* Used for closest dist */
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#define MIN_BLOB_SIZE 10 /* Big units */
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#define MAX_ASPECT_RATIO 2.5 /* Widest character */
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/*----------------------------------------------------------------------
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M a c r o s
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----------------------------------------------------------------------*/
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/**********************************************************************
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* same_point
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*
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* Return TRUE if the point values are the same. The parameters must
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* be of type POINT.
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**********************************************************************/
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#define same_point(p1,p2) \
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((abs (p1.x - p2.x) < same_distance) && \
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(abs (p1.y - p2.y) < same_distance))
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/**********************************************************************
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* dist_square
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*
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* Return the square of the distance between these two points. The
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* parameters must be of type POINT.
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**********************************************************************/
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#define dist_square(p1,p2) \
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((p2.x - p1.x) * (p2.x - p1.x) + \
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(p2.y - p1.y) * (p2.y - p1.y))
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/**********************************************************************
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* closest
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*
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* The expression provides the EDGEPT that is closest to the point in
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* question. All three parameters must be of type EDGEPT.
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**********************************************************************/
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#define closest(test_p,p1,p2) \
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(p1 ? \
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(p2 ? \
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((dist_square (test_p->pos, p1->pos) < \
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dist_square (test_p->pos, p2->pos)) ? \
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p1 : \
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p2) : \
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p1) : \
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p2)
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/**********************************************************************
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* edgept_dist
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*
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* Return the distance (squared) between the two edge points.
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**********************************************************************/
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#define edgept_dist(p1,p2) \
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(dist_square ((p1)->pos, (p2)->pos))
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/**********************************************************************
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* is_exterior_point
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*
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* Return TRUE if the point supplied is an exterior projection from the
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* outline.
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**********************************************************************/
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#define is_exterior_point(edge,point) \
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(same_point (edge->prev->pos, point->pos) || \
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same_point (edge->next->pos, point->pos) || \
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(angle_change (edge->prev, edge, edge->next) - \
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angle_change (edge->prev, edge, point) > 20))
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/**********************************************************************
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* is_equal
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*
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* Return TRUE if the POINTs are equal.
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**********************************************************************/
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#define is_equal(p1,p2) \
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(((p1).x == (p2).x) && ((p1).y == (p2).y))
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/**********************************************************************
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* is_on_line
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*
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* Return TRUE if the point is on the line segment between the two end
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* points. The two end points are included as part of the line. The
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* parameters must be of type POINT.
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**********************************************************************/
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#define is_on_line(p,p0,p1) \
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(within_range ((p).x, (p0).x, (p1).x) && \
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within_range ((p).y, (p0).y, (p1).y))
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/**********************************************************************
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* within_range
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*
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* Return TRUE if the first number is in between the second two numbers.
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* Return FALSE otherwise.
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**********************************************************************/
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#define within_range(x,x0,x1) \
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(((x0 <= x) && (x <= x1)) || ((x1 <= x) && (x <= x0)))
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/*----------------------------------------------------------------------
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F u n c t i o n s
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----------------------------------------------------------------------*/
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int crosses_outline(EDGEPT *p0, /* Start of line */
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EDGEPT *p1, /* End of line */
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EDGEPT *outline);
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int is_crossed(TPOINT a0, TPOINT a1, TPOINT b0, TPOINT b1);
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int is_same_edgept(EDGEPT *p1, EDGEPT *p2);
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EDGEPT *near_point(EDGEPT *point, EDGEPT *line_pt_0, EDGEPT *line_pt_1);
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void reverse_outline(EDGEPT *outline);
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#endif
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