tesseract 4.1.1
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scanedg.h
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1/**********************************************************************
2 * File: scanedg.h (Formerly scanedge.h)
3 * Description: Raster scanning crack based edge extractor.
4 * Author: Ray Smith
5 *
6 * (C) Copyright 1991, Hewlett-Packard Ltd.
7 ** Licensed under the Apache License, Version 2.0 (the "License");
8 ** you may not use this file except in compliance with the License.
9 ** You may obtain a copy of the License at
10 ** http://www.apache.org/licenses/LICENSE-2.0
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 *
17 **********************************************************************/
18
19#ifndef SCANEDG_H
20#define SCANEDG_H
21
22#include "params.h"
23#include "scrollview.h"
24#include "pdblock.h"
25#include "crakedge.h"
26
27class C_OUTLINE_IT;
28
29struct CrackPos {
30 CRACKEDGE** free_cracks; // Freelist for fast allocation.
31 int x; // Position of new edge.
32 int y;
33};
34
35struct Pix;
36
37void block_edges(Pix *t_image, // thresholded image
38 PDBLK *block, // block in image
39 C_OUTLINE_IT* outline_it);
40void make_margins(PDBLK *block, // block in image
41 BLOCK_LINE_IT *line_it, // for old style
42 uint8_t *pixels, // pixels to strip
43 uint8_t margin, // white-out pixel
44 int16_t left, // block edges
45 int16_t right,
46 int16_t y); // line coord );
47void line_edges(int16_t x, // coord of line start
48 int16_t y, // coord of line
49 int16_t xext, // width of line
50 uint8_t uppercolour, // start of prev line
51 uint8_t * bwpos, // thresholded line
52 CRACKEDGE ** prevline, // edges in progress
53 CRACKEDGE **free_cracks,
54 C_OUTLINE_IT* outline_it);
55CRACKEDGE *h_edge(int sign, // sign of edge
56 CRACKEDGE * join, // edge to join to
57 CrackPos* pos);
58CRACKEDGE *v_edge(int sign, // sign of edge
59 CRACKEDGE * join, // edge to join to
60 CrackPos* pos);
61void join_edges(CRACKEDGE *edge1, // edges to join
62 CRACKEDGE *edge2, // no specific order
63 CRACKEDGE **free_cracks,
64 C_OUTLINE_IT* outline_it);
65void free_crackedges(CRACKEDGE *start);
66
67#endif
CRACKEDGE * v_edge(int sign, CRACKEDGE *join, CrackPos *pos)
Definition: scanedg.cpp:276
void free_crackedges(CRACKEDGE *start)
Definition: scanedg.cpp:361
void make_margins(PDBLK *block, BLOCK_LINE_IT *line_it, uint8_t *pixels, uint8_t margin, int16_t left, int16_t right, int16_t y)
Definition: scanedg.cpp:87
void join_edges(CRACKEDGE *edge1, CRACKEDGE *edge2, CRACKEDGE **free_cracks, C_OUTLINE_IT *outline_it)
Definition: scanedg.cpp:328
void line_edges(int16_t x, int16_t y, int16_t xext, uint8_t uppercolour, uint8_t *bwpos, CRACKEDGE **prevline, CRACKEDGE **free_cracks, C_OUTLINE_IT *outline_it)
Definition: scanedg.cpp:142
void block_edges(Pix *t_image, PDBLK *block, C_OUTLINE_IT *outline_it)
Definition: scanedg.cpp:37
CRACKEDGE * h_edge(int sign, CRACKEDGE *join, CrackPos *pos)
Definition: scanedg.cpp:225
page block
Definition: pdblock.h:31
rectangle iterator
Definition: pdblock.h:145
int x
Definition: scanedg.h:31
int y
Definition: scanedg.h:32
CRACKEDGE ** free_cracks
Definition: scanedg.h:30