mirror of
https://github.com/tesseract-ocr/tesseract.git
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140 lines
5.1 KiB
C++
140 lines
5.1 KiB
C++
// Copyright 2011 Google Inc. All Rights Reserved.
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// Author: rays@google.com (Ray Smith)
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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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// Filename: classifier_tester.cpp
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// Purpose: Tests a character classifier on data as formatted for training,
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// but doesn't have to be the same as the training data.
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// Author: Ray Smith
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#include <algorithm>
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#include <cstdio>
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#ifdef GOOGLE_TESSERACT
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#include "base/commandlineflags.h"
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#endif // GOOGLE_TESSERACT
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#include "baseapi.h"
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#include "commontraining.h"
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#include "mastertrainer.h"
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#include "params.h"
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#include "strngs.h"
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#include "tessclassifier.h"
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#include "tesseractclass.h"
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STRING_PARAM_FLAG(classifier, "", "Classifier to test");
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STRING_PARAM_FLAG(lang, "eng", "Language to test");
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STRING_PARAM_FLAG(tessdata_dir, "", "Directory of traineddata files");
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DECLARE_INT_PARAM_FLAG(debug_level);
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enum ClassifierName {
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CN_PRUNER,
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CN_FULL,
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CN_COUNT
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};
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static const char* names[] = {"pruner", "full"};
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static tesseract::ShapeClassifier* InitializeClassifier(
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const char* classifer_name, const UNICHARSET& unicharset,
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int argc, char **argv,
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tesseract::TessBaseAPI** api) {
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// Decode the classifier string.
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ClassifierName classifier = CN_COUNT;
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for (int c = 0; c < CN_COUNT; ++c) {
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if (strcmp(classifer_name, names[c]) == 0) {
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classifier = static_cast<ClassifierName>(c);
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break;
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}
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}
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if (classifier == CN_COUNT) {
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fprintf(stderr, "Invalid classifier name:%s\n", FLAGS_classifier.c_str());
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return nullptr;
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}
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// We need to initialize tesseract to test.
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*api = new tesseract::TessBaseAPI;
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tesseract::OcrEngineMode engine_mode = tesseract::OEM_TESSERACT_ONLY;
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tesseract::Tesseract* tesseract = nullptr;
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tesseract::Classify* classify = nullptr;
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if (
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classifier == CN_PRUNER || classifier == CN_FULL) {
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if ((*api)->Init(FLAGS_tessdata_dir.c_str(), FLAGS_lang.c_str(),
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engine_mode) < 0) {
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fprintf(stderr, "Tesseract initialization failed!\n");
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return nullptr;
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}
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tesseract = const_cast<tesseract::Tesseract*>((*api)->tesseract());
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classify = static_cast<tesseract::Classify*>(tesseract);
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if (classify->shape_table() == nullptr) {
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fprintf(stderr, "Tesseract must contain a ShapeTable!\n");
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return nullptr;
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}
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}
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tesseract::ShapeClassifier* shape_classifier = nullptr;
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if (classifier == CN_PRUNER) {
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shape_classifier = new tesseract::TessClassifier(true, classify);
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} else if (classifier == CN_FULL) {
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shape_classifier = new tesseract::TessClassifier(false, classify);
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}
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tprintf("Testing classifier %s:\n", classifer_name);
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return shape_classifier;
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}
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// This program has complex setup requirements, so here is some help:
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// Two different modes, tr files and serialized mastertrainer.
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// From tr files:
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// classifier_tester -U unicharset -F font_properties -X xheights
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// -classifier x -lang lang [-output_trainer trainer] *.tr
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// From a serialized trainer:
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// classifier_tester -input_trainer trainer [-lang lang] -classifier x
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//
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// In the first case, the unicharset must be the unicharset from within
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// the classifier under test, and the font_properties and xheights files must
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// match the files used during training.
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// In the second case, the trainer file must have been prepared from
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// some previous run of shapeclustering, mftraining, or classifier_tester
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// using the same conditions as above, ie matching unicharset/font_properties.
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//
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// Available values of classifier (x above) are:
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// pruner : Tesseract class pruner only.
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// full : Tesseract full classifier.
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// with an input trainer.)
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int main(int argc, char **argv) {
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tesseract::CheckSharedLibraryVersion();
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ParseArguments(&argc, &argv);
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STRING file_prefix;
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tesseract::MasterTrainer* trainer =
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tesseract::LoadTrainingData(argc, argv, false, nullptr, &file_prefix);
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tesseract::TessBaseAPI* api;
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// Decode the classifier string.
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tesseract::ShapeClassifier* shape_classifier = InitializeClassifier(
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FLAGS_classifier.c_str(), trainer->unicharset(), argc, argv, &api);
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if (shape_classifier == nullptr) {
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fprintf(stderr, "Classifier init failed!:%s\n", FLAGS_classifier.c_str());
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return 1;
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}
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// We want to test junk as well if it is available.
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// trainer->IncludeJunk();
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// We want to test with replicated samples too.
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trainer->ReplicateAndRandomizeSamplesIfRequired();
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trainer->TestClassifierOnSamples(tesseract::CT_UNICHAR_TOP1_ERR,
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std::max(3, static_cast<int>(FLAGS_debug_level)), false,
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shape_classifier, nullptr);
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delete shape_classifier;
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delete api;
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delete trainer;
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return 0;
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} /* main */
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