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