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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@289 d0cd1f9f-072b-0410-8dd7-cf729c803f20
558 lines
18 KiB
C++
558 lines
18 KiB
C++
/**********************************************************************
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* File: blobbox.h (Formerly blobnbox.h)
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* Description: Code for the textord blob class.
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* Author: Ray Smith
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* Created: Thu Jul 30 09:08:51 BST 1992
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*
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* (C) Copyright 1992, Hewlett-Packard Ltd.
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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 BLOBBOX_H
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#define BLOBBOX_H
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#include "varable.h"
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#include "clst.h"
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#include "elst2.h"
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#include "werd.h"
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#include "ocrblock.h"
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#include "statistc.h"
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extern double_VAR_H (textord_error_weight, 3,
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"Weighting for error in believability");
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enum PITCH_TYPE
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{
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PITCH_DUNNO, //insufficient data
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PITCH_DEF_FIXED, //definitely fixed
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PITCH_MAYBE_FIXED, //could be
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PITCH_DEF_PROP,
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PITCH_MAYBE_PROP,
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PITCH_CORR_FIXED,
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PITCH_CORR_PROP
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};
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// The possible tab-stop types of each side of a BLOBNBOX.
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enum TabType {
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TT_NONE, // Not a tab.
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TT_DELETED, // Not a tab after detailed analysis.
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TT_UNCONFIRMED, // Initial designation of a tab-stop candidate.
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TT_FAKE, // Added by interpolation.
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TT_CONFIRMED, // Aligned with neighbours.
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TT_VLINE // Detected as a vertical line.
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};
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// The possible region types of a BLOBNBOX.
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// Note: keep all the text types > BRT_UNKNOWN and all the image types less.
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// Keep in sync with kBlobTypes in colpartition.cpp and BoxColor below.
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enum BlobRegionType {
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BRT_NOISE, // Neither text nor image.
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BRT_HLINE, // Horizontal separator line.
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BRT_RECTIMAGE, // Rectangular image.
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BRT_POLYIMAGE, // Non-rectangular image.
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BRT_UNKNOWN, // Not determined yet.
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BRT_VERT_TEXT, // Vertical alignment, not necessarily vertically oriented.
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BRT_TEXT, // Convincing text.
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BRT_COUNT // Number of possibilities.
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};
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namespace tesseract {
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class ColPartition;
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}
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class BLOBNBOX;
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ELISTIZEH (BLOBNBOX)
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class BLOBNBOX:public ELIST_LINK
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{
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public:
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BLOBNBOX() {
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blob_ptr = NULL;
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cblob_ptr = NULL;
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area = 0;
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Init();
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}
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explicit BLOBNBOX(PBLOB *srcblob) {
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blob_ptr = srcblob;
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cblob_ptr = NULL;
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box = srcblob->bounding_box ();
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area = (int) srcblob->area ();
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Init();
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}
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explicit BLOBNBOX(C_BLOB *srcblob) {
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blob_ptr = NULL;
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cblob_ptr = srcblob;
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box = srcblob->bounding_box ();
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area = (int) srcblob->area ();
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Init();
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}
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void rotate_box(FCOORD vec) {
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box.rotate(vec);
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}
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void translate_box(ICOORD v) {
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box.move(v);
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}
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void merge(BLOBNBOX *nextblob);
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void chop( // fake chop blob
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BLOBNBOX_IT *start_it, // location of this
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BLOBNBOX_IT *blob_it, // iterator
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FCOORD rotation, // for landscape
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float xheight); // line height
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// Simple accessors.
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const TBOX& bounding_box() const {
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return box;
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}
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void compute_bounding_box() {
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box = cblob_ptr != NULL ? cblob_ptr->bounding_box()
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: blob_ptr->bounding_box();
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}
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const TBOX& reduced_box() const {
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return red_box;
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}
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void set_reduced_box(TBOX new_box) {
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red_box = new_box;
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reduced = TRUE;
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}
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inT32 enclosed_area() const {
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return area;
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}
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bool joined_to_prev() const {
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return joined != 0;
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}
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bool red_box_set() const {
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return reduced != 0;
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}
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int repeated_set() const {
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return repeated_set_;
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}
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void set_repeated_set(int set_id) {
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repeated_set_ = set_id;
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}
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PBLOB *blob() const {
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return blob_ptr;
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}
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C_BLOB *cblob() const {
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return cblob_ptr;
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}
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TabType left_tab_type() const {
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return left_tab_type_;
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}
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void set_left_tab_type(TabType new_type) {
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left_tab_type_ = new_type;
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}
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TabType right_tab_type() const {
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return right_tab_type_;
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}
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void set_right_tab_type(TabType new_type) {
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right_tab_type_ = new_type;
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}
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BlobRegionType region_type() const {
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return region_type_;
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}
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void set_region_type(BlobRegionType new_type) {
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region_type_ = new_type;
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}
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int left_rule() const {
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return left_rule_;
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}
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void set_left_rule(int new_left) {
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left_rule_ = new_left;
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}
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int right_rule() const {
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return right_rule_;
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}
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void set_right_rule(int new_right) {
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right_rule_ = new_right;
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}
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int left_crossing_rule() const {
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return left_crossing_rule_;
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}
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void set_left_crossing_rule(int new_left) {
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left_crossing_rule_ = new_left;
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}
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int right_crossing_rule() const {
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return right_crossing_rule_;
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}
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void set_right_crossing_rule(int new_right) {
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right_crossing_rule_ = new_right;
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}
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float horz_stroke_width() const {
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return horz_stroke_width_;
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}
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void set_horz_stroke_width(float width) {
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horz_stroke_width_ = width;
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}
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float vert_stroke_width() const {
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return vert_stroke_width_;
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}
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void set_vert_stroke_width(float width) {
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vert_stroke_width_ = width;
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}
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tesseract::ColPartition* owner() const {
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return owner_;
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}
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void set_owner(tesseract::ColPartition* new_owner) {
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owner_ = new_owner;
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}
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void set_noise_flag(bool flag) {
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noise_flag_ = flag;
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}
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bool noise_flag() const {
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return noise_flag_;
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}
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#ifndef GRAPHICS_DISABLED
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// Keep in sync with BlobRegionType.
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ScrollView::Color BoxColor() const {
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switch (region_type_) {
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case BRT_HLINE:
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return ScrollView::YELLOW;
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case BRT_RECTIMAGE:
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return ScrollView::RED;
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case BRT_POLYIMAGE:
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return ScrollView::ORANGE;
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case BRT_UNKNOWN:
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return ScrollView::CYAN;
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case BRT_VERT_TEXT:
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return ScrollView::GREEN;
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case BRT_TEXT:
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return ScrollView::BLUE;
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case BRT_NOISE:
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default:
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return ScrollView::GREY;
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}
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}
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void plot(ScrollView* window, // window to draw in
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ScrollView::Color blob_colour, // for outer bits
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ScrollView::Color child_colour) { // for holes
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if (blob_ptr != NULL)
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blob_ptr->plot(window, blob_colour, child_colour);
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if (cblob_ptr != NULL)
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cblob_ptr->plot(window, blob_colour, child_colour);
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}
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#endif
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NEWDELETE2(BLOBNBOX)
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private:
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// Initializes the bulk of the members to default values.
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void Init() {
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joined = false;
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reduced = false;
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repeated_set_ = 0;
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left_tab_type_ = TT_NONE;
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right_tab_type_ = TT_NONE;
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region_type_ = BRT_UNKNOWN;
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left_rule_ = 0;
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right_rule_ = 0;
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left_crossing_rule_ = 0;
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right_crossing_rule_ = 0;
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horz_stroke_width_ = 0.0f;
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vert_stroke_width_ = 0.0f;
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owner_ = NULL;
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noise_flag_ = false;
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}
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PBLOB *blob_ptr; // poly blob
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C_BLOB *cblob_ptr; // edgestep blob
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TBOX box; // bounding box
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TBOX red_box; // bounding box
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int area:30; // enclosed area
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int joined:1; // joined to prev
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int reduced:1; // reduced box set
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int repeated_set_; // id of the set of repeated blobs
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TabType left_tab_type_; // Indicates tab-stop assessment
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TabType right_tab_type_; // Indicates tab-stop assessment
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BlobRegionType region_type_; // Type of region this blob belongs to
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inT16 left_rule_; // x-coord of nearest but not crossing rule line
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inT16 right_rule_; // x-coord of nearest but not crossing rule line
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inT16 left_crossing_rule_; // x-coord of nearest or crossing rule line
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inT16 right_crossing_rule_; // x-coord of nearest or crossing rule line
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float horz_stroke_width_; // Median horizontal stroke width
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float vert_stroke_width_; // Median vertical stroke width
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tesseract::ColPartition* owner_; // Who will delete me when I am not needed
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// Was the blob flagged as noise in the initial filtering step
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bool noise_flag_;
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};
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class TO_ROW:public ELIST2_LINK
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{
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public:
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TO_ROW() {
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num_repeated_sets_ = -1;
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} //empty
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TO_ROW( //constructor
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BLOBNBOX *blob, //from first blob
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float top, //of row //target height
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float bottom,
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float row_size);
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float max_y() const { //access function
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return y_max;
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}
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float min_y() const {
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return y_min;
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}
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float mean_y() const {
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return (y_min + y_max) / 2.0f;
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}
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float initial_min_y() const {
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return initial_y_min;
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}
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float line_m() const { //access to line fit
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return m;
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}
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float line_c() const {
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return c;
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}
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float line_error() const {
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return error;
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}
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float parallel_c() const {
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return para_c;
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}
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float parallel_error() const {
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return para_error;
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}
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float believability() const { //baseline goodness
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return credibility;
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}
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float intercept() const { //real parallel_c
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return y_origin;
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}
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void add_blob( //put in row
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BLOBNBOX *blob, //blob to add
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float top, //of row //target height
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float bottom,
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float row_size);
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void insert_blob( //put in row in order
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BLOBNBOX *blob);
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BLOBNBOX_LIST *blob_list() { //get list
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return &blobs;
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}
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void set_line( //set line spec
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float new_m, //line to set
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float new_c,
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float new_error) {
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m = new_m;
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c = new_c;
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error = new_error;
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}
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void set_parallel_line( //set fixed gradient line
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float gradient, //page gradient
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float new_c,
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float new_error) {
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para_c = new_c;
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para_error = new_error;
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credibility =
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(float) (blobs.length () - textord_error_weight * new_error);
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y_origin = (float) (new_c / sqrt (1 + gradient * gradient));
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//real intercept
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}
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void set_limits( //set min,max
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float new_min, //bottom and
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float new_max) { //top of row
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y_min = new_min;
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y_max = new_max;
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}
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void compute_vertical_projection();
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//get projection
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bool rep_chars_marked() const {
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return num_repeated_sets_ != -1;
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}
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void clear_rep_chars_marked() {
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num_repeated_sets_ = -1;
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}
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int num_repeated_sets() const {
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return num_repeated_sets_;
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}
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void set_num_repeated_sets(int num_sets) {
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num_repeated_sets_ = num_sets;
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}
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// true when dead
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NEWDELETE2 (TO_ROW) BOOL8 merged;
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BOOL8 all_caps; // had no ascenders
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BOOL8 used_dm_model; // in guessing pitch
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inT16 projection_left; // start of projection
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inT16 projection_right; // start of projection
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PITCH_TYPE pitch_decision; // how strong is decision
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float fixed_pitch; // pitch or 0
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float fp_space; // sp if fixed pitch
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float fp_nonsp; // nonsp if fixed pitch
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float pr_space; // sp if prop
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float pr_nonsp; // non sp if prop
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float spacing; // to "next" row
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float xheight; // of line
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int xheight_evidence; // number of blobs of height xheight
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float ascrise; // ascenders
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float descdrop; // descenders
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inT32 min_space; // min size for real space
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inT32 max_nonspace; // max size of non-space
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inT32 space_threshold; // space vs nonspace
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float kern_size; // average non-space
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float space_size; // average space
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WERD_LIST rep_words; // repeated chars
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ICOORDELT_LIST char_cells; // fixed pitch cells
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QSPLINE baseline; // curved baseline
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STATS projection; // vertical projection
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private:
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BLOBNBOX_LIST blobs; //blobs in row
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float y_min; //coords
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float y_max;
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float initial_y_min;
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float m, c; //line spec
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float error; //line error
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float para_c; //constrained fit
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float para_error;
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float y_origin; //rotated para_c;
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float credibility; //baseline believability
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int num_repeated_sets_; // number of sets of repeated blobs
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// set to -1 if we have not searched
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// for repeated blobs in this row yet
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};
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ELIST2IZEH (TO_ROW)
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class TO_BLOCK:public ELIST_LINK
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{
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public:
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TO_BLOCK() {
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} //empty
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TO_BLOCK( //constructor
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BLOCK *src_block); //real block
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~TO_BLOCK();
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TO_ROW_LIST *get_rows() { //access function
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return &row_list;
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}
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void print_rows() { //debug info
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TO_ROW_IT row_it = &row_list;
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TO_ROW *row;
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for (row_it.mark_cycle_pt (); !row_it.cycled_list ();
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row_it.forward ()) {
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row = row_it.data ();
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printf ("Row range (%g,%g), para_c=%g, blobcount=" INT32FORMAT
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"\n", row->min_y (), row->max_y (), row->parallel_c (),
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row->blob_list ()->length ());
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}
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}
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// Draw the blobs on on the various lists in the block in different colors.
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void plot_graded_blobs(ScrollView* to_win);
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BLOBNBOX_LIST blobs; //medium size
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BLOBNBOX_LIST underlines; //underline blobs
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BLOBNBOX_LIST noise_blobs; //very small
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BLOBNBOX_LIST small_blobs; //fairly small
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BLOBNBOX_LIST large_blobs; //big blobs
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BLOCK *block; //real block
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PITCH_TYPE pitch_decision; //how strong is decision
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float line_spacing; //estimate
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float line_size; //estimate
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float max_blob_size; //line assignment limit
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float baseline_offset; //phase shift
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float xheight; //median blob size
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float fixed_pitch; //pitch or 0
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float kern_size; //average non-space
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float space_size; //average space
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inT32 min_space; //min definite space
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inT32 max_nonspace; //max definite
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float fp_space; //sp if fixed pitch
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float fp_nonsp; //nonsp if fixed pitch
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float pr_space; //sp if prop
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float pr_nonsp; //non sp if prop
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TO_ROW *key_row; //starting row
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NEWDELETE2 (TO_BLOCK) private:
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TO_ROW_LIST row_list; //temporary rows
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};
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ELISTIZEH (TO_BLOCK)
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extern double_VAR_H (textord_error_weight, 3,
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"Weighting for error in believability");
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void find_blob_limits( //get y limits
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PBLOB *blob, //blob to search
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float leftx, //x limits
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float rightx,
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FCOORD rotation, //for landscape
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float &ymin, //output y limits
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float &ymax);
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void find_cblob_limits( //get y limits
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C_BLOB *blob, //blob to search
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float leftx, //x limits
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float rightx,
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FCOORD rotation, //for landscape
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float &ymin, //output y limits
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float &ymax);
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void find_cblob_vlimits( //get y limits
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C_BLOB *blob, //blob to search
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float leftx, //x limits
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float rightx,
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float &ymin, //output y limits
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float &ymax);
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void find_cblob_hlimits( //get x limits
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C_BLOB *blob, //blob to search
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float bottomy, //y limits
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float topy,
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float &xmin, //output x limits
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float &xymax);
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PBLOB *rotate_blob( //get y limits
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PBLOB *blob, //blob to search
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FCOORD rotation //vector to rotate by
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);
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PBLOB *rotate_cblob( //rotate it
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C_BLOB *blob, //blob to search
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float xheight, //for poly approx
|
|
FCOORD rotation //for landscape
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|
);
|
|
C_BLOB *crotate_cblob( //rotate it
|
|
C_BLOB *blob, //blob to search
|
|
FCOORD rotation //for landscape
|
|
);
|
|
TBOX box_next( //get bounding box
|
|
BLOBNBOX_IT *it //iterator to blobds
|
|
);
|
|
TBOX box_next_pre_chopped( //get bounding box
|
|
BLOBNBOX_IT *it //iterator to blobds
|
|
);
|
|
void vertical_blob_projection( //project outlines
|
|
PBLOB *blob, //blob to project
|
|
STATS *stats //output
|
|
);
|
|
//project outlines
|
|
void vertical_outline_projection(OUTLINE *outline, //outline to project
|
|
STATS *stats //output
|
|
);
|
|
void vertical_cblob_projection( //project outlines
|
|
C_BLOB *blob, //blob to project
|
|
STATS *stats //output
|
|
);
|
|
void vertical_coutline_projection( //project outlines
|
|
C_OUTLINE *outline, //outline to project
|
|
STATS *stats //output
|
|
);
|
|
void plot_blob_list(ScrollView* win, // window to draw in
|
|
BLOBNBOX_LIST *list, // blob list
|
|
ScrollView::Color body_colour, // colour to draw
|
|
ScrollView::Color child_colour); // colour of child
|
|
|
|
#endif
|