tesseract/unittest/applybox_test.cc
Stefan Weil bc69e28de3 Update include statements for external header file allheaders.h
Signed-off-by: Stefan Weil <sw@weilnetz.de>
2021-02-13 10:17:20 +01:00

129 lines
4.7 KiB
C++

// (C) Copyright 2017, 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 <string>
#include <allheaders.h>
#include <tesseract/baseapi.h>
#include "boxread.h"
#include "rect.h"
#include <tesseract/resultiterator.h>
#include "include_gunit.h"
namespace tesseract {
const char* kTruthTextWords = "To simple burn running of goods lately.\n";
const char* kTruthTextLine = "Tosimpleburnrunningofgoodslately.\n";
// The fixture for testing Tesseract.
class ApplyBoxTest : public testing::Test {
protected:
std::string TestDataNameToPath(const std::string& name) {
return file::JoinPath(TESTING_DIR, name);
}
std::string TessdataPath() { return TESSDATA_DIR; }
ApplyBoxTest() { src_pix_ = nullptr; }
~ApplyBoxTest() { pixDestroy(&src_pix_); }
bool SetImage(const char* filename) {
bool found = false;
pixDestroy(&src_pix_);
src_pix_ = pixRead(TestDataNameToPath(filename).c_str());
if (api_.Init(TessdataPath().c_str(), "eng", tesseract::OEM_TESSERACT_ONLY) != -1) {
api_.SetPageSegMode(tesseract::PSM_SINGLE_BLOCK);
api_.SetImage(src_pix_);
api_.SetVariable("tessedit_make_boxes_from_boxes", "1");
api_.SetInputName(TestDataNameToPath(filename).c_str());
found = true;
}
return found;
}
// Runs ApplyBoxes (via setting the appropriate variables and Recognize)
// and checks that the output ocr text matches the truth_str, and that
// the boxes match the given box file well enough.
// If line_mode is true, ApplyBoxes is run in line segmentation mode,
// otherwise the input box file is assumed to have character-level boxes.
void VerifyBoxesAndText(const char* imagefile, const char* truth_str,
const char* target_box_file, bool line_mode) {
if (!SetImage(imagefile)) {
// eng.traineddata not found or other problem during Init.
GTEST_SKIP();
return;
}
if (line_mode)
api_.SetVariable("tessedit_resegment_from_line_boxes", "1");
else
api_.SetVariable("tessedit_resegment_from_boxes", "1");
api_.Recognize(nullptr);
char* ocr_text = api_.GetUTF8Text();
EXPECT_STREQ(truth_str, ocr_text);
delete[] ocr_text;
// Test the boxes by reading the target box file in parallel with the
// bounding boxes in the ocr output.
std::string box_filename = TestDataNameToPath(target_box_file);
FILE* box_file = OpenBoxFile(box_filename.c_str());
ASSERT_TRUE(box_file != nullptr);
int height = pixGetHeight(src_pix_);
ResultIterator* it = api_.GetIterator();
do {
int left, top, right, bottom;
EXPECT_TRUE(
it->BoundingBox(tesseract::RIL_SYMBOL, &left, &top, &right, &bottom));
TBOX ocr_box(ICOORD(left, height - bottom), ICOORD(right, height - top));
int line_number = 0;
TBOX truth_box;
STRING box_text;
EXPECT_TRUE(
ReadNextBox(0, &line_number, box_file, &box_text, &truth_box));
// Testing for major overlap is a bit weak, but if they all
// major overlap successfully, then it has to be fairly close.
EXPECT_TRUE(ocr_box.major_overlap(truth_box));
// Also check that the symbol text matches the box text.
char* symbol_text = it->GetUTF8Text(tesseract::RIL_SYMBOL);
EXPECT_STREQ(box_text.c_str(), symbol_text);
delete[] symbol_text;
} while (it->Next(tesseract::RIL_SYMBOL));
delete it;
}
Pix* src_pix_;
std::string ocr_text_;
tesseract::TessBaseAPI api_;
};
// Tests character-level applyboxes on normal Times New Roman.
TEST_F(ApplyBoxTest, TimesCharLevel) {
VerifyBoxesAndText("trainingtimes.tif", kTruthTextWords, "trainingtimes.box",
false);
}
// Tests character-level applyboxes on italic Times New Roman.
TEST_F(ApplyBoxTest, ItalicCharLevel) {
VerifyBoxesAndText("trainingital.tif", kTruthTextWords, "trainingital.box",
false);
}
// Tests line-level applyboxes on normal Times New Roman.
TEST_F(ApplyBoxTest, TimesLineLevel) {
VerifyBoxesAndText("trainingtimesline.tif", kTruthTextLine,
"trainingtimes.box", true);
}
// Tests line-level applyboxes on italic Times New Roman.
TEST_F(ApplyBoxTest, ItalLineLevel) {
VerifyBoxesAndText("trainingitalline.tif", kTruthTextLine, "trainingital.box",
true);
}
} // namespace