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