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// (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.
#if defined(_WIN32)
#include <io.h> // for _access
#else
#include <unistd.h> // for access
#endif
#include <string>
#include "allheaders.h"
#include <tesseract/baseapi.h>
#include "helpers.h"
#include "log.h"
#include "include_gunit.h"
namespace tesseract {
// Replacement for std::filesystem::exists (C++-17)
static bool file_exists(const char* filename) {
#if defined(_WIN32)
return _access(filename, 0) == 0;
#else
return access(filename, 0) == 0;
#endif
}
// The fixture for testing Tesseract.
class PageSegModeTest : public testing::Test {
protected:
PageSegModeTest() = default;
~PageSegModeTest() {
pixDestroy(&src_pix_);
}
void SetUp() override {
static std::locale system_locale("");
std::locale::global(system_locale);
}
void SetImage(const char* filename) {
pixDestroy(&src_pix_);
src_pix_ = pixRead(filename);
api_.Init(TESSDATA_DIR, "eng", tesseract::OEM_TESSERACT_ONLY);
api_.SetImage(src_pix_);
}
// Tests that the given rectangle produces exactly the given text in the
// given segmentation mode (after chopping off the last 2 newlines.)
void VerifyRectText(tesseract::PageSegMode mode, const char* str,
int left, int top, int width, int height) {
api_.SetPageSegMode(mode);
api_.SetRectangle(left, top, width, height);
char* result = api_.GetUTF8Text();
chomp_string(result);
chomp_string(result);
EXPECT_STREQ(str, result);
delete[] result;
}
// Tests that the given rectangle does NOT produce the given text in the
// given segmentation mode.
void NotRectText(tesseract::PageSegMode mode, const char* str,
int left, int top, int width, int height) {
api_.SetPageSegMode(mode);
api_.SetRectangle(left, top, width, height);
char* result = api_.GetUTF8Text();
EXPECT_STRNE(str, result);
delete[] result;
}
Pix* src_pix_ = nullptr;
std::string ocr_text_;
tesseract::TessBaseAPI api_;
};
// Tests the single-word segmentation mode, and that it performs correctly
// and differently to line and block mode.
TEST_F(PageSegModeTest, WordTest) {
std::string filename = file::JoinPath(TESTING_DIR, "segmodeimg.tif");
if (!file_exists(filename.c_str())) {
LOG(INFO) << "Skip test because of missing " << filename << '\n';
GTEST_SKIP();
} else {
SetImage(filename.c_str());
// Test various rectangles around the inverse page number.
VerifyRectText(tesseract::PSM_SINGLE_WORD, "183", 1419, 264, 69, 34);
VerifyRectText(tesseract::PSM_SINGLE_WORD, "183", 1411, 252, 78, 62);
VerifyRectText(tesseract::PSM_SINGLE_WORD, "183", 1396, 218, 114, 102);
// Test a random pair of words as a line
VerifyRectText(tesseract::PSM_SINGLE_LINE,
"What should", 237, 393, 256, 36);
// Test a random pair of words as a word
VerifyRectText(tesseract::PSM_SINGLE_WORD,
"Whatshould", 237, 393, 256, 36);
// Test single block mode.
VerifyRectText(tesseract::PSM_SINGLE_BLOCK,
"both the\nfrom the", 237, 450, 172, 94);
// But doesn't work in line or word mode.
NotRectText(tesseract::PSM_SINGLE_LINE,
"both the\nfrom the", 237, 450, 172, 94);
NotRectText(tesseract::PSM_SINGLE_WORD,
"both the\nfrom the", 237, 450, 172, 94);
}
}
} // namespace
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