tesseractclass.cpp

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// File:        tesseractclass.cpp
// Description: The Tesseract class. It holds/owns everything needed
//              to run Tesseract on a single language, and also a set of
//              sub-Tesseracts to run sub-languages. For thread safety, *every*
//              variable that was previously global or static (except for
//              constant data, and some visual debugging flags) has been moved
//              in here, directly, or indirectly.
//              This makes it safe to run multiple Tesseracts in different
//              threads in parallel, and keeps the different language
//              instances separate.
//              Some global functions remain, but they are isolated re-entrant
//              functions that operate on their arguments. Functions that work
//              on variable data have been moved to an appropriate class based
//              mostly on the directory hierarchy. For more information see
//              slide 6 of "2ArchitectureAndDataStructures" in
// https://drive.google.com/file/d/0B7l10Bj_LprhbUlIUFlCdGtDYkE/edit?usp=sharing
//              Some global data and related functions still exist in the
//              training-related code, but they don't interfere with normal
//              recognition operation.
// Author:      Ray Smith
// Created:     Fri Mar 07 08:17:01 PST 2008
//
// (C) Copyright 2008, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

// Include automatically generated configuration file if running autoconf.
#ifdef HAVE_CONFIG_H
#include "config_auto.h"
#endif

#include "tesseractclass.h"

#include "allheaders.h"
#include "edgblob.h"
#include "equationdetect.h"
#include "globals.h"
#ifndef ANDROID_BUILD
#include "lstmrecognizer.h"
#endif

namespace tesseract {

Tesseract::Tesseract()
    : BOOL_MEMBER(tessedit_resegment_from_boxes, false,
                  "Take segmentation and labeling from box file",
                  this->params()),
      BOOL_MEMBER(tessedit_resegment_from_line_boxes, false,
                  "Conversion of word/line box file to char box file",
                  this->params()),
      BOOL_MEMBER(tessedit_train_from_boxes, false,
                  "Generate training data from boxed chars", this->params()),
      BOOL_MEMBER(tessedit_make_boxes_from_boxes, false,
                  "Generate more boxes from boxed chars", this->params()),
      BOOL_MEMBER(tessedit_train_line_recognizer, false,
                  "Break input into lines and remap boxes if present",
                  this->params()),
      BOOL_MEMBER(tessedit_dump_pageseg_images, false,
                  "Dump intermediate images made during page segmentation",
                  this->params()),
      // The default for pageseg_mode is the old behaviour, so as not to
      // upset anything that relies on that.
      INT_MEMBER(
          tessedit_pageseg_mode, PSM_SINGLE_BLOCK,
          "Page seg mode: 0=osd only, 1=auto+osd, 2=auto, 3=col, 4=block,"
          " 5=line, 6=word, 7=char"
          " (Values from PageSegMode enum in publictypes.h)",
          this->params()),
      INT_INIT_MEMBER(tessedit_ocr_engine_mode, tesseract::OEM_DEFAULT,
                      "Which OCR engine(s) to run (Tesseract, LSTM, both)."
                      " Defaults to loading and running the most accurate"
                      " available.",
                      this->params()),
      STRING_MEMBER(tessedit_char_blacklist, "",
                    "Blacklist of chars not to recognize", this->params()),
      STRING_MEMBER(tessedit_char_whitelist, "",
                    "Whitelist of chars to recognize", this->params()),
      STRING_MEMBER(tessedit_char_unblacklist, "",
                    "List of chars to override tessedit_char_blacklist",
                    this->params()),
      BOOL_MEMBER(tessedit_ambigs_training, false,
                  "Perform training for ambiguities", this->params()),
      INT_MEMBER(pageseg_devanagari_split_strategy,
                 tesseract::ShiroRekhaSplitter::NO_SPLIT,
                 "Whether to use the top-line splitting process for Devanagari "
                 "documents while performing page-segmentation.",
                 this->params()),
      INT_MEMBER(ocr_devanagari_split_strategy,
                 tesseract::ShiroRekhaSplitter::NO_SPLIT,
                 "Whether to use the top-line splitting process for Devanagari "
                 "documents while performing ocr.",
                 this->params()),
      STRING_MEMBER(tessedit_write_params_to_file, "",
                    "Write all parameters to the given file.", this->params()),
      BOOL_MEMBER(tessedit_adaption_debug, false,
                  "Generate and print debug"
                  " information for adaption",
                  this->params()),
      INT_MEMBER(bidi_debug, 0, "Debug level for BiDi", this->params()),
      INT_MEMBER(applybox_debug, 1, "Debug level", this->params()),
      INT_MEMBER(applybox_page, 0, "Page number to apply boxes from",
                 this->params()),
      STRING_MEMBER(applybox_exposure_pattern, ".exp",
                    "Exposure value follows"
                    " this pattern in the image filename. The name of the image"
                    " files are expected to be in the form"
                    " [lang].[fontname].exp[num].tif",
                    this->params()),
      BOOL_MEMBER(applybox_learn_chars_and_char_frags_mode, false,
                  "Learn both character fragments (as is done in the"
                  " special low exposure mode) as well as unfragmented"
                  " characters.",
                  this->params()),
      BOOL_MEMBER(applybox_learn_ngrams_mode, false,
                  "Each bounding box"
                  " is assumed to contain ngrams. Only learn the ngrams"
                  " whose outlines overlap horizontally.",
                  this->params()),
      BOOL_MEMBER(tessedit_display_outwords, false, "Draw output words",
                  this->params()),
      BOOL_MEMBER(tessedit_dump_choices, false, "Dump char choices",
                  this->params()),
      BOOL_MEMBER(tessedit_timing_debug, false, "Print timing stats",
                  this->params()),
      BOOL_MEMBER(tessedit_fix_fuzzy_spaces, true,
                  "Try to improve fuzzy spaces", this->params()),
      BOOL_MEMBER(tessedit_unrej_any_wd, false,
                  "Don't bother with word plausibility", this->params()),
      BOOL_MEMBER(tessedit_fix_hyphens, true, "Crunch double hyphens?",
                  this->params()),
      BOOL_MEMBER(tessedit_redo_xheight, true, "Check/Correct x-height",
                  this->params()),
      BOOL_MEMBER(tessedit_enable_doc_dict, true,
                  "Add words to the document dictionary", this->params()),
      BOOL_MEMBER(tessedit_debug_fonts, false, "Output font info per char",
                  this->params()),
      BOOL_MEMBER(tessedit_debug_block_rejection, false, "Block and Row stats",
                  this->params()),
      BOOL_MEMBER(tessedit_enable_bigram_correction, true,
                  "Enable correction based on the word bigram dictionary.",
                  this->params()),
      BOOL_MEMBER(tessedit_enable_dict_correction, false,
                  "Enable single word correction based on the dictionary.",
                  this->params()),
      INT_MEMBER(tessedit_bigram_debug, 0,
                 "Amount of debug output for bigram correction.",
                 this->params()),
      BOOL_MEMBER(enable_noise_removal, true,
                  "Remove and conditionally reassign small outlines when they"
                  " confuse layout analysis, determining diacritics vs noise",
                  this->params()),
      INT_MEMBER(debug_noise_removal, 0, "Debug reassignment of small outlines",
                 this->params()),
      // Worst (min) certainty, for which a diacritic is allowed to make the
      // base
      // character worse and still be included.
      double_MEMBER(noise_cert_basechar, -8.0,
                    "Hingepoint for base char certainty", this->params()),
      // Worst (min) certainty, for which a non-overlapping diacritic is allowed
      // to make the base character worse and still be included.
      double_MEMBER(noise_cert_disjoint, -1.0,
                    "Hingepoint for disjoint certainty", this->params()),
      // Worst (min) certainty, for which a diacritic is allowed to make a new
      // stand-alone blob.
      double_MEMBER(noise_cert_punc, -3.0,
                    "Threshold for new punc char certainty", this->params()),
      // Factor of certainty margin for adding diacritics to not count as worse.
      double_MEMBER(noise_cert_factor, 0.375,
                    "Scaling on certainty diff from Hingepoint",
                    this->params()),
      INT_MEMBER(noise_maxperblob, 8, "Max diacritics to apply to a blob",
                 this->params()),
      INT_MEMBER(noise_maxperword, 16, "Max diacritics to apply to a word",
                 this->params()),
      INT_MEMBER(debug_x_ht_level, 0, "Reestimate debug", this->params()),
      BOOL_MEMBER(debug_acceptable_wds, false, "Dump word pass/fail chk",
                  this->params()),
      STRING_MEMBER(chs_leading_punct, "('`\"", "Leading punctuation",
                    this->params()),
      STRING_MEMBER(chs_trailing_punct1, ").,;:?!", "1st Trailing punctuation",
                    this->params()),
      STRING_MEMBER(chs_trailing_punct2, ")'`\"", "2nd Trailing punctuation",
                    this->params()),
      double_MEMBER(quality_rej_pc, 0.08,
                    "good_quality_doc lte rejection limit", this->params()),
      double_MEMBER(quality_blob_pc, 0.0,
                    "good_quality_doc gte good blobs limit", this->params()),
      double_MEMBER(quality_outline_pc, 1.0,
                    "good_quality_doc lte outline error limit", this->params()),
      double_MEMBER(quality_char_pc, 0.95,
                    "good_quality_doc gte good char limit", this->params()),
      INT_MEMBER(quality_min_initial_alphas_reqd, 2, "alphas in a good word",
                 this->params()),
      INT_MEMBER(tessedit_tess_adaption_mode, 0x27,
                 "Adaptation decision algorithm for tess", this->params()),
      BOOL_MEMBER(tessedit_minimal_rej_pass1, false,
                  "Do minimal rejection on pass 1 output", this->params()),
      BOOL_MEMBER(tessedit_test_adaption, false, "Test adaption criteria",
                  this->params()),
      BOOL_MEMBER(tessedit_matcher_log, false, "Log matcher activity",
                  this->params()),
      INT_MEMBER(tessedit_test_adaption_mode, 3,
                 "Adaptation decision algorithm for tess", this->params()),
      BOOL_MEMBER(test_pt, false, "Test for point", this->params()),
      double_MEMBER(test_pt_x, 99999.99, "xcoord", this->params()),
      double_MEMBER(test_pt_y, 99999.99, "ycoord", this->params()),
      INT_MEMBER(multilang_debug_level, 0, "Print multilang debug info.",
                 this->params()),
      INT_MEMBER(paragraph_debug_level, 0, "Print paragraph debug info.",
                 this->params()),
      BOOL_MEMBER(paragraph_text_based, true,
                  "Run paragraph detection on the post-text-recognition "
                  "(more accurate)",
                  this->params()),
      BOOL_MEMBER(lstm_use_matrix, 1,
                  "Use ratings matrix/beam search with lstm", this->params()),
      STRING_MEMBER(outlines_odd, "%| ", "Non standard number of outlines",
                    this->params()),
      STRING_MEMBER(outlines_2, "ij!?%\":;", "Non standard number of outlines",
                    this->params()),
      BOOL_MEMBER(docqual_excuse_outline_errs, false,
                  "Allow outline errs in unrejection?", this->params()),
      BOOL_MEMBER(tessedit_good_quality_unrej, true,
                  "Reduce rejection on good docs", this->params()),
      BOOL_MEMBER(tessedit_use_reject_spaces, true, "Reject spaces?",
                  this->params()),
      double_MEMBER(tessedit_reject_doc_percent, 65.00,
                    "%rej allowed before rej whole doc", this->params()),
      double_MEMBER(tessedit_reject_block_percent, 45.00,
                    "%rej allowed before rej whole block", this->params()),
      double_MEMBER(tessedit_reject_row_percent, 40.00,
                    "%rej allowed before rej whole row", this->params()),
      double_MEMBER(tessedit_whole_wd_rej_row_percent, 70.00,
                    "Number of row rejects in whole word rejects"
                    " which prevents whole row rejection",
                    this->params()),
      BOOL_MEMBER(tessedit_preserve_blk_rej_perfect_wds, true,
                  "Only rej partially rejected words in block rejection",
                  this->params()),
      BOOL_MEMBER(tessedit_preserve_row_rej_perfect_wds, true,
                  "Only rej partially rejected words in row rejection",
                  this->params()),
      BOOL_MEMBER(tessedit_dont_blkrej_good_wds, false,
                  "Use word segmentation quality metric", this->params()),
      BOOL_MEMBER(tessedit_dont_rowrej_good_wds, false,
                  "Use word segmentation quality metric", this->params()),
      INT_MEMBER(tessedit_preserve_min_wd_len, 2,
                 "Only preserve wds longer than this", this->params()),
      BOOL_MEMBER(tessedit_row_rej_good_docs, true,
                  "Apply row rejection to good docs", this->params()),
      double_MEMBER(tessedit_good_doc_still_rowrej_wd, 1.1,
                    "rej good doc wd if more than this fraction rejected",
                    this->params()),
      BOOL_MEMBER(tessedit_reject_bad_qual_wds, true,
                  "Reject all bad quality wds", this->params()),
      BOOL_MEMBER(tessedit_debug_doc_rejection, false, "Page stats",
                  this->params()),
      BOOL_MEMBER(tessedit_debug_quality_metrics, false,
                  "Output data to debug file", this->params()),
      BOOL_MEMBER(bland_unrej, false, "unrej potential with no checks",
                  this->params()),
      double_MEMBER(quality_rowrej_pc, 1.1,
                    "good_quality_doc gte good char limit", this->params()),
      BOOL_MEMBER(unlv_tilde_crunching, false,
                  "Mark v.bad words for tilde crunch", this->params()),
      BOOL_MEMBER(hocr_font_info, false, "Add font info to hocr output",
                  this->params()),
      BOOL_MEMBER(crunch_early_merge_tess_fails, true, "Before word crunch?",
                  this->params()),
      BOOL_MEMBER(crunch_early_convert_bad_unlv_chs, false,
                  "Take out ~^ early?", this->params()),
      double_MEMBER(crunch_terrible_rating, 80.0, "crunch rating lt this",
                    this->params()),
      BOOL_MEMBER(crunch_terrible_garbage, true, "As it says", this->params()),
      double_MEMBER(crunch_poor_garbage_cert, -9.0,
                    "crunch garbage cert lt this", this->params()),
      double_MEMBER(crunch_poor_garbage_rate, 60,
                    "crunch garbage rating lt this", this->params()),
      double_MEMBER(crunch_pot_poor_rate, 40, "POTENTIAL crunch rating lt this",
                    this->params()),
      double_MEMBER(crunch_pot_poor_cert, -8.0, "POTENTIAL crunch cert lt this",
                    this->params()),
      BOOL_MEMBER(crunch_pot_garbage, true, "POTENTIAL crunch garbage",
                  this->params()),
      double_MEMBER(crunch_del_rating, 60, "POTENTIAL crunch rating lt this",
                    this->params()),
      double_MEMBER(crunch_del_cert, -10.0, "POTENTIAL crunch cert lt this",
                    this->params()),
      double_MEMBER(crunch_del_min_ht, 0.7, "Del if word ht lt xht x this",
                    this->params()),
      double_MEMBER(crunch_del_max_ht, 3.0, "Del if word ht gt xht x this",
                    this->params()),
      double_MEMBER(crunch_del_min_width, 3.0,
                    "Del if word width lt xht x this", this->params()),
      double_MEMBER(crunch_del_high_word, 1.5,
                    "Del if word gt xht x this above bl", this->params()),
      double_MEMBER(crunch_del_low_word, 0.5,
                    "Del if word gt xht x this below bl", this->params()),
      double_MEMBER(crunch_small_outlines_size, 0.6, "Small if lt xht x this",
                    this->params()),
      INT_MEMBER(crunch_rating_max, 10, "For adj length in rating per ch",
                 this->params()),
      INT_MEMBER(crunch_pot_indicators, 1,
                 "How many potential indicators needed", this->params()),
      BOOL_MEMBER(crunch_leave_ok_strings, true, "Don't touch sensible strings",
                  this->params()),
      BOOL_MEMBER(crunch_accept_ok, true, "Use acceptability in okstring",
                  this->params()),
      BOOL_MEMBER(crunch_leave_accept_strings, false,
                  "Don't pot crunch sensible strings", this->params()),
      BOOL_MEMBER(crunch_include_numerals, false, "Fiddle alpha figures",
                  this->params()),
      INT_MEMBER(crunch_leave_lc_strings, 4,
                 "Don't crunch words with long lower case strings",
                 this->params()),
      INT_MEMBER(crunch_leave_uc_strings, 4,
                 "Don't crunch words with long lower case strings",
                 this->params()),
      INT_MEMBER(crunch_long_repetitions, 3,
                 "Crunch words with long repetitions", this->params()),
      INT_MEMBER(crunch_debug, 0, "As it says", this->params()),
      INT_MEMBER(fixsp_non_noise_limit, 1,
                 "How many non-noise blbs either side?", this->params()),
      double_MEMBER(fixsp_small_outlines_size, 0.28, "Small if lt xht x this",
                    this->params()),
      BOOL_MEMBER(tessedit_prefer_joined_punct, false,
                  "Reward punctuation joins", this->params()),
      INT_MEMBER(fixsp_done_mode, 1, "What constitues done for spacing",
                 this->params()),
      INT_MEMBER(debug_fix_space_level, 0, "Contextual fixspace debug",
                 this->params()),
      STRING_MEMBER(numeric_punctuation, ".,",
                    "Punct. chs expected WITHIN numbers", this->params()),
      INT_MEMBER(x_ht_acceptance_tolerance, 8,
                 "Max allowed deviation of blob top outside of font data",
                 this->params()),
      INT_MEMBER(x_ht_min_change, 8,
                 "Min change in xht before actually trying it", this->params()),
      INT_MEMBER(superscript_debug, 0,
                 "Debug level for sub & superscript fixer", this->params()),
      double_MEMBER(
          superscript_worse_certainty, 2.0,
          "How many times worse "
          "certainty does a superscript position glyph need to be for "
          "us to try classifying it as a char with a different "
          "baseline?",
          this->params()),
      double_MEMBER(
          superscript_bettered_certainty, 0.97,
          "What reduction in "
          "badness do we think sufficient to choose a superscript "
          "over what we'd thought.  For example, a value of 0.6 means "
          "we want to reduce badness of certainty by at least 40%",
          this->params()),
      double_MEMBER(superscript_scaledown_ratio, 0.4,
                    "A superscript scaled down more than this is unbelievably "
                    "small.  For example, 0.3 means we expect the font size to "
                    "be no smaller than 30% of the text line font size.",
                    this->params()),
      double_MEMBER(subscript_max_y_top, 0.5,
                    "Maximum top of a character measured as a multiple of "
                    "x-height above the baseline for us to reconsider whether "
                    "it's a subscript.",
                    this->params()),
      double_MEMBER(superscript_min_y_bottom, 0.3,
                    "Minimum bottom of a character measured as a multiple of "
                    "x-height above the baseline for us to reconsider whether "
                    "it's a superscript.",
                    this->params()),
      BOOL_MEMBER(tessedit_write_block_separators, false,
                  "Write block separators in output", this->params()),
      BOOL_MEMBER(tessedit_write_rep_codes, false, "Write repetition char code",
                  this->params()),
      BOOL_MEMBER(tessedit_write_unlv, false, "Write .unlv output file",
                  this->params()),
      BOOL_MEMBER(tessedit_create_txt, false, "Write .txt output file",
                  this->params()),
      BOOL_MEMBER(tessedit_create_hocr, false, "Write .html hOCR output file",
                  this->params()),
      BOOL_MEMBER(tessedit_create_tsv, false, "Write .tsv output file",
                  this->params()),
      BOOL_MEMBER(tessedit_create_pdf, false, "Write .pdf output file",
                  this->params()),
      BOOL_MEMBER(textonly_pdf, false,
                  "Create PDF with only one invisible text layer",
                  this->params()),
      INT_MEMBER(jpg_quality, 85, "Set JPEG quality level", this->params()),
      INT_MEMBER(user_defined_dpi, 0, "Specify DPI for input image",
                 this->params()),
      INT_MEMBER(min_characters_to_try, 50,
                 "Specify minimum characters to try during OSD",
                 this->params()),
      STRING_MEMBER(unrecognised_char, "|",
                    "Output char for unidentified blobs", this->params()),
      INT_MEMBER(suspect_level, 99, "Suspect marker level", this->params()),
      INT_MEMBER(suspect_space_level, 100,
                 "Min suspect level for rejecting spaces", this->params()),
      INT_MEMBER(suspect_short_words, 2,
                 "Don't suspect dict wds longer than this", this->params()),
      BOOL_MEMBER(suspect_constrain_1Il, false, "UNLV keep 1Il chars rejected",
                  this->params()),
      double_MEMBER(suspect_rating_per_ch, 999.9,
                    "Don't touch bad rating limit", this->params()),
      double_MEMBER(suspect_accept_rating, -999.9, "Accept good rating limit",
                    this->params()),
      BOOL_MEMBER(tessedit_minimal_rejection, false,
                  "Only reject tess failures", this->params()),
      BOOL_MEMBER(tessedit_zero_rejection, false, "Don't reject ANYTHING",
                  this->params()),
      BOOL_MEMBER(tessedit_word_for_word, false,
                  "Make output have exactly one word per WERD", this->params()),
      BOOL_MEMBER(tessedit_zero_kelvin_rejection, false,
                  "Don't reject ANYTHING AT ALL", this->params()),
      BOOL_MEMBER(tessedit_consistent_reps, true,
                  "Force all rep chars the same", this->params()),
      INT_MEMBER(tessedit_reject_mode, 0, "Rejection algorithm",
                 this->params()),
      BOOL_MEMBER(tessedit_rejection_debug, false, "Adaption debug",
                  this->params()),
      BOOL_MEMBER(tessedit_flip_0O, true, "Contextual 0O O0 flips",
                  this->params()),
      double_MEMBER(tessedit_lower_flip_hyphen, 1.5,
                    "Aspect ratio dot/hyphen test", this->params()),
      double_MEMBER(tessedit_upper_flip_hyphen, 1.8,
                    "Aspect ratio dot/hyphen test", this->params()),
      BOOL_MEMBER(rej_trust_doc_dawg, false,
                  "Use DOC dawg in 11l conf. detector", this->params()),
      BOOL_MEMBER(rej_1Il_use_dict_word, false, "Use dictword test",
                  this->params()),
      BOOL_MEMBER(rej_1Il_trust_permuter_type, true, "Don't double check",
                  this->params()),
      BOOL_MEMBER(rej_use_tess_accepted, true, "Individual rejection control",
                  this->params()),
      BOOL_MEMBER(rej_use_tess_blanks, true, "Individual rejection control",
                  this->params()),
      BOOL_MEMBER(rej_use_good_perm, true, "Individual rejection control",
                  this->params()),
      BOOL_MEMBER(rej_use_sensible_wd, false, "Extend permuter check",
                  this->params()),
      BOOL_MEMBER(rej_alphas_in_number_perm, false, "Extend permuter check",
                  this->params()),
      double_MEMBER(rej_whole_of_mostly_reject_word_fract, 0.85,
                    "if >this fract", this->params()),
      INT_MEMBER(tessedit_image_border, 2, "Rej blbs near image edge limit",
                 this->params()),
      STRING_MEMBER(ok_repeated_ch_non_alphanum_wds, "-?*\075",
                    "Allow NN to unrej", this->params()),
      STRING_MEMBER(conflict_set_I_l_1, "Il1[]", "Il1 conflict set",
                    this->params()),
      INT_MEMBER(min_sane_x_ht_pixels, 8, "Reject any x-ht lt or eq than this",
                 this->params()),
      BOOL_MEMBER(tessedit_create_boxfile, false, "Output text with boxes",
                  this->params()),
      INT_MEMBER(tessedit_page_number, -1,
                 "-1 -> All pages"
                 " , else specific page to process",
                 this->params()),
      BOOL_MEMBER(tessedit_write_images, false,
                  "Capture the image from the IPE", this->params()),
      BOOL_MEMBER(interactive_display_mode, false, "Run interactively?",
                  this->params()),
      STRING_MEMBER(file_type, ".tif", "Filename extension", this->params()),
      BOOL_MEMBER(tessedit_override_permuter, true, "According to dict_word",
                  this->params()),
      STRING_MEMBER(tessedit_load_sublangs, "",
                    "List of languages to load with this one", this->params()),
      BOOL_MEMBER(tessedit_use_primary_params_model, false,
                  "In multilingual mode use params model of the"
                  " primary language",
                  this->params()),
      double_MEMBER(min_orientation_margin, 7.0,
                    "Min acceptable orientation margin", this->params()),
      BOOL_MEMBER(textord_tabfind_show_vlines, false, "Debug line finding",
                  this->params()),
      BOOL_MEMBER(textord_use_cjk_fp_model, FALSE, "Use CJK fixed pitch model",
                  this->params()),
      BOOL_MEMBER(poly_allow_detailed_fx, false,
                  "Allow feature extractors to see the original outline",
                  this->params()),
      BOOL_INIT_MEMBER(tessedit_init_config_only, false,
                       "Only initialize with the config file. Useful if the "
                       "instance is not going to be used for OCR but say only "
                       "for layout analysis.",
                       this->params()),
      BOOL_MEMBER(textord_equation_detect, false, "Turn on equation detector",
                  this->params()),
      BOOL_MEMBER(textord_tabfind_vertical_text, true,
                  "Enable vertical detection", this->params()),
      BOOL_MEMBER(textord_tabfind_force_vertical_text, false,
                  "Force using vertical text page mode", this->params()),
      double_MEMBER(
          textord_tabfind_vertical_text_ratio, 0.5,
          "Fraction of textlines deemed vertical to use vertical page "
          "mode",
          this->params()),
      double_MEMBER(
          textord_tabfind_aligned_gap_fraction, 0.75,
          "Fraction of height used as a minimum gap for aligned blobs.",
          this->params()),
      INT_MEMBER(tessedit_parallelize, 0, "Run in parallel where possible",
                 this->params()),
      BOOL_MEMBER(preserve_interword_spaces, false,
                  "Preserve multiple interword spaces", this->params()),
      STRING_MEMBER(page_separator, "\f",
                    "Page separator (default is form feed control character)",
                    this->params()),
      INT_MEMBER(lstm_choice_mode, 0,
          "Allows to include alternative symbols choices in the hOCR output. "
          "Valid input values are 0, 1 and 2. 0 is the default value. "
          "With 1 the alternative symbol choices per timestep are included. "
          "With 2 the alternative symbol choices are accumulated per character.",
          this->params()),

      backup_config_file_(nullptr),
      pix_binary_(nullptr),
      pix_grey_(nullptr),
      pix_original_(nullptr),
      pix_thresholds_(nullptr),
      source_resolution_(0),
      textord_(this),
      right_to_left_(false),
      scaled_color_(nullptr),
      scaled_factor_(-1),
      deskew_(1.0f, 0.0f),
      reskew_(1.0f, 0.0f),
      most_recently_used_(this),
      font_table_size_(0),
      equ_detect_(nullptr),
#ifndef ANDROID_BUILD
      lstm_recognizer_(nullptr),
#endif
      train_line_page_num_(0) {
}

Tesseract::~Tesseract() {
  Clear();
  pixDestroy(&pix_original_);
  end_tesseract();
  sub_langs_.delete_data_pointers();
#ifndef ANDROID_BUILD
  delete lstm_recognizer_;
  lstm_recognizer_ = nullptr;
#endif
}

Dict& Tesseract::getDict()
{
    if (0 == Classify::getDict().NumDawgs() && AnyLSTMLang())
    {
        if (lstm_recognizer_ && lstm_recognizer_->GetDict())
        {
            return *const_cast<Dict*>(lstm_recognizer_->GetDict());
        }
    }
    return Classify::getDict();
  }


void Tesseract::Clear() {
  STRING debug_name = imagebasename + "_debug.pdf";
  pixa_debug_.WritePDF(debug_name.string());
  pixDestroy(&pix_binary_);
  pixDestroy(&pix_grey_);
  pixDestroy(&pix_thresholds_);
  pixDestroy(&scaled_color_);
  deskew_ = FCOORD(1.0f, 0.0f);
  reskew_ = FCOORD(1.0f, 0.0f);
  splitter_.Clear();
  scaled_factor_ = -1;
  for (int i = 0; i < sub_langs_.size(); ++i)
    sub_langs_[i]->Clear();
}

#ifndef DISABLED_LEGACY_ENGINE

void Tesseract::SetEquationDetect(EquationDetect* detector) {
  equ_detect_ = detector;
  equ_detect_->SetLangTesseract(this);
}

// Clear all memory of adaption for this and all subclassifiers.
void Tesseract::ResetAdaptiveClassifier() {
  ResetAdaptiveClassifierInternal();
  for (int i = 0; i < sub_langs_.size(); ++i) {
    sub_langs_[i]->ResetAdaptiveClassifierInternal();
  }
}

#endif  //ndef DISABLED_LEGACY_ENGINE

// Clear the document dictionary for this and all subclassifiers.
void Tesseract::ResetDocumentDictionary() {
  getDict().ResetDocumentDictionary();
  for (int i = 0; i < sub_langs_.size(); ++i) {
    sub_langs_[i]->getDict().ResetDocumentDictionary();
  }
}

void Tesseract::SetBlackAndWhitelist() {
  // Set the white and blacklists (if any)
  unicharset.set_black_and_whitelist(tessedit_char_blacklist.string(),
                                     tessedit_char_whitelist.string(),
                                     tessedit_char_unblacklist.string());
  // Black and white lists should apply to all loaded classifiers.
  for (int i = 0; i < sub_langs_.size(); ++i) {
    sub_langs_[i]->unicharset.set_black_and_whitelist(
        tessedit_char_blacklist.string(), tessedit_char_whitelist.string(),
        tessedit_char_unblacklist.string());
  }
}

// Perform steps to prepare underlying binary image/other data structures for
// page segmentation.
void Tesseract::PrepareForPageseg() {
  textord_.set_use_cjk_fp_model(textord_use_cjk_fp_model);
  // Find the max splitter strategy over all langs.
  ShiroRekhaSplitter::SplitStrategy max_pageseg_strategy =
      static_cast<ShiroRekhaSplitter::SplitStrategy>(
      static_cast<int32_t>(pageseg_devanagari_split_strategy));
  for (int i = 0; i < sub_langs_.size(); ++i) {
    ShiroRekhaSplitter::SplitStrategy pageseg_strategy =
        static_cast<ShiroRekhaSplitter::SplitStrategy>(
        static_cast<int32_t>(sub_langs_[i]->pageseg_devanagari_split_strategy));
    if (pageseg_strategy > max_pageseg_strategy)
      max_pageseg_strategy = pageseg_strategy;
    pixDestroy(&sub_langs_[i]->pix_binary_);
    sub_langs_[i]->pix_binary_ = pixClone(pix_binary());
  }
  // Perform shiro-rekha (top-line) splitting and replace the current image by
  // the newly split image.
  splitter_.set_orig_pix(pix_binary());
  splitter_.set_pageseg_split_strategy(max_pageseg_strategy);
  if (splitter_.Split(true, &pixa_debug_)) {
    ASSERT_HOST(splitter_.splitted_image());
    pixDestroy(&pix_binary_);
    pix_binary_ = pixClone(splitter_.splitted_image());
  }
}

// Perform steps to prepare underlying binary image/other data structures for
// OCR. The current segmentation is required by this method.
// Note that this method resets pix_binary_ to the original binarized image,
// which may be different from the image actually used for OCR depending on the
// value of devanagari_ocr_split_strategy.
void Tesseract::PrepareForTessOCR(BLOCK_LIST* block_list,
                                  Tesseract* osd_tess, OSResults* osr) {
  // Find the max splitter strategy over all langs.
  ShiroRekhaSplitter::SplitStrategy max_ocr_strategy =
      static_cast<ShiroRekhaSplitter::SplitStrategy>(
      static_cast<int32_t>(ocr_devanagari_split_strategy));
  for (int i = 0; i < sub_langs_.size(); ++i) {
    ShiroRekhaSplitter::SplitStrategy ocr_strategy =
        static_cast<ShiroRekhaSplitter::SplitStrategy>(
        static_cast<int32_t>(sub_langs_[i]->ocr_devanagari_split_strategy));
    if (ocr_strategy > max_ocr_strategy)
      max_ocr_strategy = ocr_strategy;
  }
  // Utilize the segmentation information available.
  splitter_.set_segmentation_block_list(block_list);
  splitter_.set_ocr_split_strategy(max_ocr_strategy);
  // Run the splitter for OCR
  bool split_for_ocr = splitter_.Split(false, &pixa_debug_);
  // Restore pix_binary to the binarized original pix for future reference.
  ASSERT_HOST(splitter_.orig_pix());
  pixDestroy(&pix_binary_);
  pix_binary_ = pixClone(splitter_.orig_pix());
  // If the pageseg and ocr strategies are different, refresh the block list
  // (from the last SegmentImage call) with blobs from the real image to be used
  // for OCR.
  if (splitter_.HasDifferentSplitStrategies()) {
    BLOCK block("", TRUE, 0, 0, 0, 0, pixGetWidth(pix_binary_),
                pixGetHeight(pix_binary_));
    Pix* pix_for_ocr = split_for_ocr ? splitter_.splitted_image() :
        splitter_.orig_pix();
    extract_edges(pix_for_ocr, &block);
    splitter_.RefreshSegmentationWithNewBlobs(block.blob_list());
  }
  // The splitter isn't needed any more after this, so save memory by clearing.
  splitter_.Clear();
}

}  // namespace tesseract