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tesseract/ccmain/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, true,
"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 punctation 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()),
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()),
BOOL_MEMBER(include_page_breaks, FALSE,
"Include page separator string in output text after each "
"image/page.",
this->params()),
STRING_MEMBER(page_separator, "\f",
"Page separator (default is form feed control character)",
this->params()),
// The following parameters were deprecated and removed from their
// original
// locations. The parameters are temporarily kept here to give Tesseract
// users a chance to updated their [lang].traineddata and config files
// without introducing failures during Tesseract initialization.
// TODO(ocr-team): remove these parameters from the code once we are
// reasonably sure that Tesseract users have updated their data files.
//
// BEGIN DEPRECATED PARAMETERS
BOOL_MEMBER(textord_tabfind_vertical_horizontal_mix, true,
"find horizontal lines such as headers in vertical page mode",
this->params()),
INT_MEMBER(tessedit_ok_mode, 5, "Acceptance decision algorithm",
this->params()),
BOOL_INIT_MEMBER(load_fixed_length_dawgs, true,
"Load fixed length dawgs"
" (e.g. for non-space delimited languages)",
this->params()),
INT_MEMBER(segment_debug, 0, "Debug the whole segmentation process",
this->params()),
BOOL_MEMBER(permute_debug, 0, "Debug char permutation process",
this->params()),
double_MEMBER(bestrate_pruning_factor, 2.0,
"Multiplying factor of"
" current best rate to prune other hypotheses",
this->params()),
BOOL_MEMBER(permute_script_word, 0,
"Turn on word script consistency permuter", this->params()),
BOOL_MEMBER(segment_segcost_rating, 0,
"incorporate segmentation cost in word rating?",
this->params()),
double_MEMBER(segment_reward_script, 0.95,
"Score multipler for script consistency within a word. "
"Being a 'reward' factor, it should be <= 1. "
"Smaller value implies bigger reward.",
this->params()),
BOOL_MEMBER(permute_fixed_length_dawg, 0,
"Turn on fixed-length phrasebook search permuter",
this->params()),
BOOL_MEMBER(permute_chartype_word, 0,
"Turn on character type (property) consistency permuter",
this->params()),
double_MEMBER(segment_reward_chartype, 0.97,
"Score multipler for char type consistency within a word. ",
this->params()),
double_MEMBER(segment_reward_ngram_best_choice, 0.99,
"Score multipler for ngram permuter's best choice"
" (only used in the Han script path).",
this->params()),
BOOL_MEMBER(ngram_permuter_activated, false,
"Activate character-level n-gram-based permuter",
this->params()),
BOOL_MEMBER(permute_only_top, false, "Run only the top choice permuter",
this->params()),
INT_MEMBER(language_model_fixed_length_choices_depth, 3,
"Depth of blob choice lists to explore"
" when fixed length dawgs are on",
this->params()),
BOOL_MEMBER(use_new_state_cost, FALSE,
"use new state cost heuristics for segmentation state"
" evaluation",
this->params()),
double_MEMBER(heuristic_segcost_rating_base, 1.25,
"base factor for adding segmentation cost into word rating."
"It's a multiplying factor, the larger the value above 1, "
"the bigger the effect of segmentation cost.",
this->params()),
double_MEMBER(heuristic_weight_rating, 1.0,
"weight associated with char rating in combined cost of"
"state",
this->params()),
double_MEMBER(heuristic_weight_width, 1000.0,
"weight associated with width evidence in combined cost of"
" state",
this->params()),
double_MEMBER(heuristic_weight_seamcut, 0.0,
"weight associated with seam cut in combined cost of state",
this->params()),
double_MEMBER(heuristic_max_char_wh_ratio, 2.0,
"max char width-to-height ratio allowed in segmentation",
this->params()),
BOOL_MEMBER(enable_new_segsearch, true,
"Enable new segmentation search path.", this->params()),
double_MEMBER(segsearch_max_fixed_pitch_char_wh_ratio, 2.0,
"Maximum character width-to-height ratio for"
" fixed-pitch fonts",
this->params()),
// END DEPRECATED PARAMETERS
backup_config_file_(NULL),
pix_binary_(NULL),
pix_grey_(NULL),
pix_original_(NULL),
pix_thresholds_(NULL),
source_resolution_(0),
textord_(this),
right_to_left_(false),
scaled_color_(NULL),
scaled_factor_(-1),
deskew_(1.0f, 0.0f),
reskew_(1.0f, 0.0f),
most_recently_used_(this),
font_table_size_(0),
equ_detect_(NULL),
#ifndef ANDROID_BUILD
lstm_recognizer_(NULL),
#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_ = NULL;
#endif
}
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();
}
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();
}
}
// 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>(pageseg_devanagari_split_strategy));
for (int i = 0; i < sub_langs_.size(); ++i) {
ShiroRekhaSplitter::SplitStrategy pageseg_strategy =
static_cast<ShiroRekhaSplitter::SplitStrategy>(
static_cast<inT32>(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 splitted 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>(ocr_devanagari_split_strategy));
for (int i = 0; i < sub_langs_.size(); ++i) {
ShiroRekhaSplitter::SplitStrategy ocr_strategy =
static_cast<ShiroRekhaSplitter::SplitStrategy>(
static_cast<inT32>(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
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