tesseract/unittest/applybox_test.cc
Stefan Weil 2b7df59187 Add more unittests from Google
They were provided by Jeff Breidenbach <jbreiden@google.com>.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
2018-08-25 18:16:46 +02:00

123 lines
4.3 KiB
C++

#include <string>
#include "leptonica/include/allheaders.h"
#include "tesseract/api/baseapi.h"
#include "tesseract/ccmain/resultiterator.h"
#include "tesseract/ccstruct/boxread.h"
#include "tesseract/ccstruct/rect.h"
namespace {
using tesseract::ResultIterator;
const char* kTruthTextWords = "To simple burn running of goods lately.\n\n";
const char* kTruthTextLine = "Tosimpleburnrunningofgoodslately.\n\n";
// The fixture for testing Tesseract.
class ApplyBoxTest : public testing::Test {
protected:
string TestDataNameToPath(const string& name) {
return file::JoinPath(FLAGS_test_srcdir,
"testdata/" + name);
}
string TessdataPath() {
return file::JoinPath(FLAGS_test_srcdir,
"tessdata");
}
string OutputNameToPath(const string& name) {
return file::JoinPath(FLAGS_test_tmpdir, name);
}
ApplyBoxTest() {
src_pix_ = NULL;
}
~ApplyBoxTest() {
pixDestroy(&src_pix_);
}
void SetImage(const char* filename) {
pixDestroy(&src_pix_);
src_pix_ = pixRead(TestDataNameToPath(filename).c_str());
api_.Init(TessdataPath().c_str(), "eng", tesseract::OEM_TESSERACT_ONLY);
api_.SetPageSegMode(tesseract::PSM_SINGLE_BLOCK);
api_.SetImage(src_pix_);
api_.SetVariable("tessedit_make_boxes_from_boxes", "1");
api_.SetInputName(TestDataNameToPath(filename).c_str());
}
// 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) {
SetImage(imagefile);
if (line_mode)
api_.SetVariable("tessedit_resegment_from_line_boxes", "1");
else
api_.SetVariable("tessedit_resegment_from_boxes", "1");
api_.Recognize(NULL);
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.
string box_filename = TestDataNameToPath(target_box_file);
FILE* box_file = OpenBoxFile(STRING(box_filename.c_str()));
ASSERT_TRUE(box_file != NULL);
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;
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.string(), symbol_text);
delete [] symbol_text;
} while (it->Next(tesseract::RIL_SYMBOL));
delete it;
}
Pix* src_pix_;
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