mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-12 23:49:06 +08:00
068d43d3d8
* Remove old code for string class (no longer needed) Signed-off-by: Stefan Weil <sw@weilnetz.de> * Add std namespace to string class Signed-off-by: Stefan Weil <sw@weilnetz.de>
85 lines
4.4 KiB
C++
85 lines
4.4 KiB
C++
// Copyright 2017 Google Inc. All Rights Reserved.
|
|
// Author: rays@google.com (Ray Smith)
|
|
// Purpose: Collection of convenience functions to simplify creation of the
|
|
// unicharset, recoder, and dawgs for an LSTM model.
|
|
|
|
// 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.
|
|
#ifndef TESSERACT_TRAINING_LANG_MODEL_HELPERS_H_
|
|
#define TESSERACT_TRAINING_LANG_MODEL_HELPERS_H_
|
|
|
|
#include <string>
|
|
#include "genericvector.h"
|
|
#include "serialis.h"
|
|
#include "strngs.h"
|
|
#include "tessdatamanager.h"
|
|
#include "unicharset.h"
|
|
|
|
namespace tesseract {
|
|
|
|
// Helper makes a filename (<output_dir>/<lang>/<lang><suffix>) and writes data
|
|
// to the file, using writer if not null, otherwise, a default writer.
|
|
// Default writer will overwrite any existing file, but a supplied writer
|
|
// can do its own thing. If lang is empty, returns true but does nothing.
|
|
// NOTE that suffix should contain any required . for the filename.
|
|
bool WriteFile(const std::string& output_dir, const std::string& lang,
|
|
const std::string& suffix, const GenericVector<char>& data,
|
|
FileWriter writer);
|
|
// Helper reads a file with optional reader and returns a STRING.
|
|
// On failure emits a warning message and returns and empty STRING.
|
|
STRING ReadFile(const std::string& filename, FileReader reader);
|
|
|
|
// Helper writes the unicharset to file and to the traineddata.
|
|
bool WriteUnicharset(const UNICHARSET& unicharset, const std::string& output_dir,
|
|
const std::string& lang, FileWriter writer,
|
|
TessdataManager* traineddata);
|
|
// Helper creates the recoder from the unicharset and writes it to the
|
|
// traineddata, with a human-readable form to file at:
|
|
// <output_dir>/<lang>/<lang>.charset_size=<num> for some num being the size
|
|
// of the re-encoded character set. The charset_size file is written using
|
|
// writer if not null, or using a default file writer otherwise, overwriting
|
|
// any existing content.
|
|
// If pass_through is true, then the recoder will be a no-op, passing the
|
|
// unicharset codes through unchanged. Otherwise, the recoder will "compress"
|
|
// the unicharset by encoding Hangul in Jamos, decomposing multi-unicode
|
|
// symbols into sequences of unicodes, and encoding Han using the data in the
|
|
// radical_table_data, which must be the content of the file:
|
|
// langdata/radical-stroke.txt.
|
|
bool WriteRecoder(const UNICHARSET& unicharset, bool pass_through,
|
|
const std::string& output_dir, const std::string& lang,
|
|
FileWriter writer, STRING* radical_table_data,
|
|
TessdataManager* traineddata);
|
|
|
|
// The main function for combine_lang_model.cpp.
|
|
// Returns EXIT_SUCCESS or EXIT_FAILURE for error.
|
|
// unicharset: can be a hand-created file with incomplete fields. Its basic
|
|
// and script properties will be set before it is used.
|
|
// script_dir: should point to the langdata (github repo) directory.
|
|
// version_str: arbitrary version label.
|
|
// Output files will be written to <output_dir>/<lang>/<lang>.*
|
|
// If pass_through_recoder is true, the unicharset will be used unchanged as
|
|
// labels in the classifier, otherwise, the unicharset will be "compressed" to
|
|
// make the recognition task simpler and faster.
|
|
// The words/puncs/numbers lists may be all empty. If any are non-empty then
|
|
// puncs must be non-empty.
|
|
// lang_is_rtl indicates that the language is generally written from right
|
|
// to left (eg Arabic/Hebrew).
|
|
int CombineLangModel(const UNICHARSET& unicharset, const std::string& script_dir,
|
|
const std::string& version_str, const std::string& output_dir,
|
|
const std::string& lang, bool pass_through_recoder,
|
|
const GenericVector<STRING>& words,
|
|
const GenericVector<STRING>& puncs,
|
|
const GenericVector<STRING>& numbers, bool lang_is_rtl,
|
|
FileReader reader, FileWriter writer);
|
|
|
|
} // namespace tesseract
|
|
|
|
#endif // TESSERACT_TRAINING_LANG_MODEL_HELPERS_H_
|