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https://github.com/tesseract-ocr/tesseract.git
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0e868ef377
Tha, Vie, Kan, Tel etc. There is a new overlap detector that detects when diacritics cause a big increase in textline overlap. In such cases, diacritics from overlap regions are kept separate from layout analysis completely, allowing textline formation to happen without them. The diacritics are then assigned to 0, 1 or 2 close words at the end of layout analysis, using and modifying an old noise detection data path. The stored diacritics are used or not during recognition according to the character classifier's liking for them.
627 lines
23 KiB
C++
627 lines
23 KiB
C++
///////////////////////////////////////////////////////////////////////
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// File: pageiterator.cpp
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// Description: Iterator for tesseract page structure that avoids using
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// tesseract internal data structures.
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// Author: Ray Smith
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// Created: Fri Feb 26 14:32:09 PST 2010
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//
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// (C) Copyright 2010, Google Inc.
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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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#include "pageiterator.h"
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#include "allheaders.h"
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#include "helpers.h"
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#include "pageres.h"
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#include "tesseractclass.h"
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namespace tesseract {
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PageIterator::PageIterator(PAGE_RES* page_res, Tesseract* tesseract, int scale,
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int scaled_yres, int rect_left, int rect_top,
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int rect_width, int rect_height)
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: page_res_(page_res),
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tesseract_(tesseract),
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word_(NULL),
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word_length_(0),
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blob_index_(0),
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cblob_it_(NULL),
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include_upper_dots_(false),
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include_lower_dots_(false),
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scale_(scale),
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scaled_yres_(scaled_yres),
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rect_left_(rect_left),
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rect_top_(rect_top),
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rect_width_(rect_width),
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rect_height_(rect_height) {
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it_ = new PAGE_RES_IT(page_res);
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PageIterator::Begin();
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}
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PageIterator::~PageIterator() {
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delete it_;
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delete cblob_it_;
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}
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/**
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* PageIterators may be copied! This makes it possible to iterate over
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* all the objects at a lower level, while maintaining an iterator to
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* objects at a higher level.
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*/
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PageIterator::PageIterator(const PageIterator& src)
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: page_res_(src.page_res_),
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tesseract_(src.tesseract_),
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word_(NULL),
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word_length_(src.word_length_),
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blob_index_(src.blob_index_),
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cblob_it_(NULL),
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include_upper_dots_(src.include_upper_dots_),
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include_lower_dots_(src.include_lower_dots_),
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scale_(src.scale_),
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scaled_yres_(src.scaled_yres_),
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rect_left_(src.rect_left_),
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rect_top_(src.rect_top_),
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rect_width_(src.rect_width_),
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rect_height_(src.rect_height_) {
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it_ = new PAGE_RES_IT(*src.it_);
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BeginWord(src.blob_index_);
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}
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const PageIterator& PageIterator::operator=(const PageIterator& src) {
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page_res_ = src.page_res_;
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tesseract_ = src.tesseract_;
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include_upper_dots_ = src.include_upper_dots_;
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include_lower_dots_ = src.include_lower_dots_;
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scale_ = src.scale_;
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scaled_yres_ = src.scaled_yres_;
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rect_left_ = src.rect_left_;
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rect_top_ = src.rect_top_;
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rect_width_ = src.rect_width_;
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rect_height_ = src.rect_height_;
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if (it_ != NULL) delete it_;
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it_ = new PAGE_RES_IT(*src.it_);
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BeginWord(src.blob_index_);
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return *this;
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}
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bool PageIterator::PositionedAtSameWord(const PAGE_RES_IT* other) const {
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return (it_ == NULL && it_ == other) ||
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((other != NULL) && (it_ != NULL) && (*it_ == *other));
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}
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// ============= Moving around within the page ============.
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/** Resets the iterator to point to the start of the page. */
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void PageIterator::Begin() {
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it_->restart_page_with_empties();
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BeginWord(0);
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}
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void PageIterator::RestartParagraph() {
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if (it_->block() == NULL) return; // At end of the document.
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PAGE_RES_IT para(page_res_);
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PAGE_RES_IT next_para(para);
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next_para.forward_paragraph();
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while (next_para.cmp(*it_) <= 0) {
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para = next_para;
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next_para.forward_paragraph();
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}
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*it_ = para;
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BeginWord(0);
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}
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bool PageIterator::IsWithinFirstTextlineOfParagraph() const {
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PageIterator p_start(*this);
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p_start.RestartParagraph();
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return p_start.it_->row() == it_->row();
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}
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void PageIterator::RestartRow() {
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it_->restart_row();
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BeginWord(0);
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}
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/**
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* Moves to the start of the next object at the given level in the
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* page hierarchy, and returns false if the end of the page was reached.
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* NOTE (CHANGED!) that ALL PageIteratorLevel level values will visit each
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* non-text block at least once.
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* Think of non text blocks as containing a single para, with at least one
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* line, with a single imaginary word, containing a single symbol.
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* The bounding boxes mark out any polygonal nature of the block, and
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* PTIsTextType(BLockType()) is false for non-text blocks.
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* Calls to Next with different levels may be freely intermixed.
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* This function iterates words in right-to-left scripts correctly, if
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* the appropriate language has been loaded into Tesseract.
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*/
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bool PageIterator::Next(PageIteratorLevel level) {
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if (it_->block() == NULL) return false; // Already at the end!
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if (it_->word() == NULL)
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level = RIL_BLOCK;
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switch (level) {
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case RIL_BLOCK:
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it_->forward_block();
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break;
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case RIL_PARA:
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it_->forward_paragraph();
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break;
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case RIL_TEXTLINE:
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for (it_->forward_with_empties(); it_->row() == it_->prev_row();
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it_->forward_with_empties());
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break;
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case RIL_WORD:
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it_->forward_with_empties();
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break;
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case RIL_SYMBOL:
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if (cblob_it_ != NULL)
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cblob_it_->forward();
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++blob_index_;
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if (blob_index_ >= word_length_)
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it_->forward_with_empties();
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else
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return true;
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break;
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}
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BeginWord(0);
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return it_->block() != NULL;
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}
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/**
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* Returns true if the iterator is at the start of an object at the given
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* level. Possible uses include determining if a call to Next(RIL_WORD)
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* moved to the start of a RIL_PARA.
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*/
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bool PageIterator::IsAtBeginningOf(PageIteratorLevel level) const {
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if (it_->block() == NULL) return false; // Already at the end!
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if (it_->word() == NULL) return true; // In an image block.
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switch (level) {
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case RIL_BLOCK:
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return blob_index_ == 0 && it_->block() != it_->prev_block();
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case RIL_PARA:
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return blob_index_ == 0 &&
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(it_->block() != it_->prev_block() ||
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it_->row()->row->para() != it_->prev_row()->row->para());
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case RIL_TEXTLINE:
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return blob_index_ == 0 && it_->row() != it_->prev_row();
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case RIL_WORD:
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return blob_index_ == 0;
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case RIL_SYMBOL:
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return true;
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}
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return false;
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}
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/**
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* Returns whether the iterator is positioned at the last element in a
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* given level. (e.g. the last word in a line, the last line in a block)
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*/
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bool PageIterator::IsAtFinalElement(PageIteratorLevel level,
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PageIteratorLevel element) const {
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if (Empty(element)) return true; // Already at the end!
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// The result is true if we step forward by element and find we are
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// at the the end of the page or at beginning of *all* levels in:
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// [level, element).
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// When there is more than one level difference between element and level,
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// we could for instance move forward one symbol and still be at the first
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// word on a line, so we also have to be at the first symbol in a word.
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PageIterator next(*this);
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next.Next(element);
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if (next.Empty(element)) return true; // Reached the end of the page.
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while (element > level) {
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element = static_cast<PageIteratorLevel>(element - 1);
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if (!next.IsAtBeginningOf(element))
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return false;
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}
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return true;
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}
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/**
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* Returns whether this iterator is positioned
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* before other: -1
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* equal to other: 0
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* after other: 1
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*/
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int PageIterator::Cmp(const PageIterator &other) const {
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int word_cmp = it_->cmp(*other.it_);
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if (word_cmp != 0)
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return word_cmp;
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if (blob_index_ < other.blob_index_)
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return -1;
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if (blob_index_ == other.blob_index_)
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return 0;
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return 1;
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}
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// ============= Accessing data ==============.
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// Coordinate system:
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// Integer coordinates are at the cracks between the pixels.
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// The top-left corner of the top-left pixel in the image is at (0,0).
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// The bottom-right corner of the bottom-right pixel in the image is at
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// (width, height).
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// Every bounding box goes from the top-left of the top-left contained
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// pixel to the bottom-right of the bottom-right contained pixel, so
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// the bounding box of the single top-left pixel in the image is:
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// (0,0)->(1,1).
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// If an image rectangle has been set in the API, then returned coordinates
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// relate to the original (full) image, rather than the rectangle.
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/**
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* Returns the bounding rectangle of the current object at the given level in
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* the coordinates of the working image that is pix_binary().
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* See comment on coordinate system above.
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* Returns false if there is no such object at the current position.
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*/
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bool PageIterator::BoundingBoxInternal(PageIteratorLevel level,
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int* left, int* top,
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int* right, int* bottom) const {
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if (Empty(level))
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return false;
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TBOX box;
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PARA *para = NULL;
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switch (level) {
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case RIL_BLOCK:
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box = it_->block()->block->restricted_bounding_box(include_upper_dots_,
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include_lower_dots_);
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break;
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case RIL_PARA:
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para = it_->row()->row->para();
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// explicit fall-through.
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case RIL_TEXTLINE:
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box = it_->row()->row->restricted_bounding_box(include_upper_dots_,
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include_lower_dots_);
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break;
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case RIL_WORD:
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box = it_->word()->word->restricted_bounding_box(include_upper_dots_,
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include_lower_dots_);
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break;
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case RIL_SYMBOL:
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if (cblob_it_ == NULL)
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box = it_->word()->box_word->BlobBox(blob_index_);
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else
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box = cblob_it_->data()->bounding_box();
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}
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if (level == RIL_PARA) {
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PageIterator other = *this;
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other.Begin();
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do {
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if (other.it_->block() &&
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other.it_->block()->block == it_->block()->block &&
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other.it_->row() && other.it_->row()->row &&
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other.it_->row()->row->para() == para) {
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box = box.bounding_union(other.it_->row()->row->bounding_box());
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}
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} while (other.Next(RIL_TEXTLINE));
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}
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if (level != RIL_SYMBOL || cblob_it_ != NULL)
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box.rotate(it_->block()->block->re_rotation());
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// Now we have a box in tesseract coordinates relative to the image rectangle,
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// we have to convert the coords to a top-down system.
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const int pix_height = pixGetHeight(tesseract_->pix_binary());
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const int pix_width = pixGetWidth(tesseract_->pix_binary());
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*left = ClipToRange(static_cast<int>(box.left()), 0, pix_width);
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*top = ClipToRange(pix_height - box.top(), 0, pix_height);
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*right = ClipToRange(static_cast<int>(box.right()), *left, pix_width);
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*bottom = ClipToRange(pix_height - box.bottom(), *top, pix_height);
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return true;
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}
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/**
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* Returns the bounding rectangle of the current object at the given level in
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* coordinates of the original image.
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* See comment on coordinate system above.
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* Returns false if there is no such object at the current position.
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*/
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bool PageIterator::BoundingBox(PageIteratorLevel level,
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int* left, int* top,
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int* right, int* bottom) const {
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return BoundingBox(level, 0, left, top, right, bottom);
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}
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bool PageIterator::BoundingBox(PageIteratorLevel level, const int padding,
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int* left, int* top,
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int* right, int* bottom) const {
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if (!BoundingBoxInternal(level, left, top, right, bottom))
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return false;
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// Convert to the coordinate system of the original image.
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*left = ClipToRange(*left / scale_ + rect_left_ - padding,
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rect_left_, rect_left_ + rect_width_);
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*top = ClipToRange(*top / scale_ + rect_top_ - padding,
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rect_top_, rect_top_ + rect_height_);
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*right = ClipToRange((*right + scale_ - 1) / scale_ + rect_left_ + padding,
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*left, rect_left_ + rect_width_);
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*bottom = ClipToRange((*bottom + scale_ - 1) / scale_ + rect_top_ + padding,
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*top, rect_top_ + rect_height_);
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return true;
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}
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/** Return that there is no such object at a given level. */
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bool PageIterator::Empty(PageIteratorLevel level) const {
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if (it_->block() == NULL) return true; // Already at the end!
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if (it_->word() == NULL && level != RIL_BLOCK) return true; // image block
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if (level == RIL_SYMBOL && blob_index_ >= word_length_)
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return true; // Zero length word, or already at the end of it.
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return false;
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}
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/** Returns the type of the current block. See apitypes.h for PolyBlockType. */
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PolyBlockType PageIterator::BlockType() const {
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if (it_->block() == NULL || it_->block()->block == NULL)
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return PT_UNKNOWN; // Already at the end!
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if (it_->block()->block->poly_block() == NULL)
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return PT_FLOWING_TEXT; // No layout analysis used - assume text.
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return it_->block()->block->poly_block()->isA();
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}
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/** Returns the polygon outline of the current block. The returned Pta must
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* be ptaDestroy-ed after use. */
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Pta* PageIterator::BlockPolygon() const {
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if (it_->block() == NULL || it_->block()->block == NULL)
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return NULL; // Already at the end!
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if (it_->block()->block->poly_block() == NULL)
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return NULL; // No layout analysis used - no polygon.
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ICOORDELT_IT it(it_->block()->block->poly_block()->points());
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Pta* pta = ptaCreate(it.length());
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int num_pts = 0;
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for (it.mark_cycle_pt(); !it.cycled_list(); it.forward(), ++num_pts) {
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ICOORD* pt = it.data();
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// Convert to top-down coords within the input image.
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float x = static_cast<float>(pt->x()) / scale_ + rect_left_;
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float y = rect_top_ + rect_height_ - static_cast<float>(pt->y()) / scale_;
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ptaAddPt(pta, x, y);
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}
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return pta;
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}
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/**
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* Returns a binary image of the current object at the given level.
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* The position and size match the return from BoundingBoxInternal, and so this
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* could be upscaled with respect to the original input image.
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* Use pixDestroy to delete the image after use.
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* The following methods are used to generate the images:
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* RIL_BLOCK: mask the page image with the block polygon.
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* RIL_TEXTLINE: Clip the rectangle of the line box from the page image.
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* TODO(rays) fix this to generate and use a line polygon.
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* RIL_WORD: Clip the rectangle of the word box from the page image.
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* RIL_SYMBOL: Render the symbol outline to an image for cblobs (prior
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* to recognition) or the bounding box otherwise.
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* A reconstruction of the original image (using xor to check for double
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* representation) should be reasonably accurate,
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* apart from removed noise, at the block level. Below the block level, the
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* reconstruction will be missing images and line separators.
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* At the symbol level, kerned characters will be invade the bounding box
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* if rendered after recognition, making an xor reconstruction inaccurate, but
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* an or construction better. Before recognition, symbol-level reconstruction
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* should be good, even with xor, since the images come from the connected
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* components.
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*/
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Pix* PageIterator::GetBinaryImage(PageIteratorLevel level) const {
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int left, top, right, bottom;
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if (!BoundingBoxInternal(level, &left, &top, &right, &bottom))
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return NULL;
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if (level == RIL_SYMBOL && cblob_it_ != NULL &&
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cblob_it_->data()->area() != 0)
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return cblob_it_->data()->render();
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Box* box = boxCreate(left, top, right - left, bottom - top);
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Pix* pix = pixClipRectangle(tesseract_->pix_binary(), box, NULL);
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boxDestroy(&box);
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if (level == RIL_BLOCK || level == RIL_PARA) {
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// Clip to the block polygon as well.
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TBOX mask_box;
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Pix* mask = it_->block()->block->render_mask(&mask_box);
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int mask_x = left - mask_box.left();
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int mask_y = top - (tesseract_->ImageHeight() - mask_box.top());
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// AND the mask and pix, putting the result in pix.
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pixRasterop(pix, MAX(0, -mask_x), MAX(0, -mask_y), pixGetWidth(pix),
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pixGetHeight(pix), PIX_SRC & PIX_DST, mask, MAX(0, mask_x),
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MAX(0, mask_y));
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pixDestroy(&mask);
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}
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return pix;
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}
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/**
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* Returns an image of the current object at the given level in greyscale
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* if available in the input. To guarantee a binary image use BinaryImage.
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* NOTE that in order to give the best possible image, the bounds are
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* expanded slightly over the binary connected component, by the supplied
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* padding, so the top-left position of the returned image is returned
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* in (left,top). These will most likely not match the coordinates
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* returned by BoundingBox.
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* If you do not supply an original image, you will get a binary one.
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* Use pixDestroy to delete the image after use.
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*/
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Pix* PageIterator::GetImage(PageIteratorLevel level, int padding,
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Pix* original_img,
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int* left, int* top) const {
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int right, bottom;
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if (!BoundingBox(level, left, top, &right, &bottom))
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return NULL;
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if (original_img == NULL)
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return GetBinaryImage(level);
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// Expand the box.
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*left = MAX(*left - padding, 0);
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*top = MAX(*top - padding, 0);
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right = MIN(right + padding, rect_width_);
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bottom = MIN(bottom + padding, rect_height_);
|
|
Box* box = boxCreate(*left, *top, right - *left, bottom - *top);
|
|
Pix* grey_pix = pixClipRectangle(original_img, box, NULL);
|
|
boxDestroy(&box);
|
|
if (level == RIL_BLOCK || level == RIL_PARA) {
|
|
// Clip to the block polygon as well.
|
|
TBOX mask_box;
|
|
Pix* mask = it_->block()->block->render_mask(&mask_box);
|
|
// Copy the mask registered correctly into an image the size of grey_pix.
|
|
int mask_x = *left - mask_box.left();
|
|
int mask_y = *top - (pixGetHeight(original_img) - mask_box.top());
|
|
int width = pixGetWidth(grey_pix);
|
|
int height = pixGetHeight(grey_pix);
|
|
Pix* resized_mask = pixCreate(width, height, 1);
|
|
pixRasterop(resized_mask, MAX(0, -mask_x), MAX(0, -mask_y), width, height,
|
|
PIX_SRC, mask, MAX(0, mask_x), MAX(0, mask_y));
|
|
pixDestroy(&mask);
|
|
pixDilateBrick(resized_mask, resized_mask, 2 * padding + 1,
|
|
2 * padding + 1);
|
|
pixInvert(resized_mask, resized_mask);
|
|
pixSetMasked(grey_pix, resized_mask, MAX_UINT32);
|
|
pixDestroy(&resized_mask);
|
|
}
|
|
return grey_pix;
|
|
}
|
|
|
|
/**
|
|
* Returns the baseline of the current object at the given level.
|
|
* The baseline is the line that passes through (x1, y1) and (x2, y2).
|
|
* WARNING: with vertical text, baselines may be vertical!
|
|
*/
|
|
bool PageIterator::Baseline(PageIteratorLevel level,
|
|
int* x1, int* y1, int* x2, int* y2) const {
|
|
if (it_->word() == NULL) return false; // Already at the end!
|
|
ROW* row = it_->row()->row;
|
|
WERD* word = it_->word()->word;
|
|
TBOX box = (level == RIL_WORD || level == RIL_SYMBOL)
|
|
? word->bounding_box()
|
|
: row->bounding_box();
|
|
int left = box.left();
|
|
ICOORD startpt(left, static_cast<inT16>(row->base_line(left) + 0.5));
|
|
int right = box.right();
|
|
ICOORD endpt(right, static_cast<inT16>(row->base_line(right) + 0.5));
|
|
// Rotate to image coordinates and convert to global image coords.
|
|
startpt.rotate(it_->block()->block->re_rotation());
|
|
endpt.rotate(it_->block()->block->re_rotation());
|
|
*x1 = startpt.x() / scale_ + rect_left_;
|
|
*y1 = (rect_height_ - startpt.y()) / scale_ + rect_top_;
|
|
*x2 = endpt.x() / scale_ + rect_left_;
|
|
*y2 = (rect_height_ - endpt.y()) / scale_ + rect_top_;
|
|
return true;
|
|
}
|
|
|
|
void PageIterator::Orientation(tesseract::Orientation *orientation,
|
|
tesseract::WritingDirection *writing_direction,
|
|
tesseract::TextlineOrder *textline_order,
|
|
float *deskew_angle) const {
|
|
BLOCK* block = it_->block()->block;
|
|
|
|
// Orientation
|
|
FCOORD up_in_image(0.0, 1.0);
|
|
up_in_image.unrotate(block->classify_rotation());
|
|
up_in_image.rotate(block->re_rotation());
|
|
|
|
if (up_in_image.x() == 0.0F) {
|
|
if (up_in_image.y() > 0.0F) {
|
|
*orientation = ORIENTATION_PAGE_UP;
|
|
} else {
|
|
*orientation = ORIENTATION_PAGE_DOWN;
|
|
}
|
|
} else if (up_in_image.x() > 0.0F) {
|
|
*orientation = ORIENTATION_PAGE_RIGHT;
|
|
} else {
|
|
*orientation = ORIENTATION_PAGE_LEFT;
|
|
}
|
|
|
|
// Writing direction
|
|
bool is_vertical_text = (block->classify_rotation().x() == 0.0);
|
|
bool right_to_left = block->right_to_left();
|
|
*writing_direction =
|
|
is_vertical_text
|
|
? WRITING_DIRECTION_TOP_TO_BOTTOM
|
|
: (right_to_left
|
|
? WRITING_DIRECTION_RIGHT_TO_LEFT
|
|
: WRITING_DIRECTION_LEFT_TO_RIGHT);
|
|
|
|
// Textline Order
|
|
bool is_mongolian = false; // TODO(eger): fix me
|
|
*textline_order = is_vertical_text
|
|
? (is_mongolian
|
|
? TEXTLINE_ORDER_LEFT_TO_RIGHT
|
|
: TEXTLINE_ORDER_RIGHT_TO_LEFT)
|
|
: TEXTLINE_ORDER_TOP_TO_BOTTOM;
|
|
|
|
// Deskew angle
|
|
FCOORD skew = block->skew(); // true horizontal for textlines
|
|
*deskew_angle = -skew.angle();
|
|
}
|
|
|
|
void PageIterator::ParagraphInfo(tesseract::ParagraphJustification *just,
|
|
bool *is_list_item,
|
|
bool *is_crown,
|
|
int *first_line_indent) const {
|
|
*just = tesseract::JUSTIFICATION_UNKNOWN;
|
|
if (!it_->row() || !it_->row()->row || !it_->row()->row->para() ||
|
|
!it_->row()->row->para()->model)
|
|
return;
|
|
|
|
PARA *para = it_->row()->row->para();
|
|
*is_list_item = para->is_list_item;
|
|
*is_crown = para->is_very_first_or_continuation;
|
|
*first_line_indent = para->model->first_indent() -
|
|
para->model->body_indent();
|
|
}
|
|
|
|
/**
|
|
* Sets up the internal data for iterating the blobs of a new word, then
|
|
* moves the iterator to the given offset.
|
|
*/
|
|
void PageIterator::BeginWord(int offset) {
|
|
WERD_RES* word_res = it_->word();
|
|
if (word_res == NULL) {
|
|
// This is a non-text block, so there is no word.
|
|
word_length_ = 0;
|
|
blob_index_ = 0;
|
|
word_ = NULL;
|
|
return;
|
|
}
|
|
if (word_res->best_choice != NULL) {
|
|
// Recognition has been done, so we are using the box_word, which
|
|
// is already baseline denormalized.
|
|
word_length_ = word_res->best_choice->length();
|
|
if (word_res->box_word != NULL) {
|
|
if (word_res->box_word->length() != word_length_) {
|
|
tprintf("Corrupted word! best_choice[len=%d] = %s, box_word[len=%d]: ",
|
|
word_length_, word_res->best_choice->unichar_string().string(),
|
|
word_res->box_word->length());
|
|
word_res->box_word->bounding_box().print();
|
|
}
|
|
ASSERT_HOST(word_res->box_word->length() == word_length_);
|
|
}
|
|
word_ = NULL;
|
|
// We will be iterating the box_word.
|
|
if (cblob_it_ != NULL) {
|
|
delete cblob_it_;
|
|
cblob_it_ = NULL;
|
|
}
|
|
} else {
|
|
// No recognition yet, so a "symbol" is a cblob.
|
|
word_ = word_res->word;
|
|
ASSERT_HOST(word_->cblob_list() != NULL);
|
|
word_length_ = word_->cblob_list()->length();
|
|
if (cblob_it_ == NULL) cblob_it_ = new C_BLOB_IT;
|
|
cblob_it_->set_to_list(word_->cblob_list());
|
|
}
|
|
for (blob_index_ = 0; blob_index_ < offset; ++blob_index_) {
|
|
if (cblob_it_ != NULL)
|
|
cblob_it_->forward();
|
|
}
|
|
}
|
|
|
|
bool PageIterator::SetWordBlamerBundle(BlamerBundle *blamer_bundle) {
|
|
if (it_->word() != NULL) {
|
|
it_->word()->blamer_bundle = blamer_bundle;
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
} // namespace tesseract.
|