osd_test.cc

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// File:        osd_test.cc
// Description: OSD Tests for Tesseract.
// Author:      ShreeDevi Kumar
//
// 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.

//based on https://gist.github.com/amitdo/7c7a522004dd79b398340c9595b377e1 

// expects clones of tessdata, tessdata_fast and tessdata_best repos

#include "log.h"
#include "include_gunit.h"
#include "baseapi.h"
#include "leptonica/allheaders.h"
#include <iostream>
#include <string>

namespace {

class TestClass : public testing::Test {
 protected:
  };
  
  void OSDTester( int expected_deg, const char* imgname, const char* tessdatadir) {
    log.info() << tessdatadir << " for image: " << imgname << std::endl;
    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    ASSERT_FALSE(api->Init(tessdatadir, "osd")) << "Could not initialize tesseract.";
    Pix *image = pixRead(imgname);
    ASSERT_TRUE(image != nullptr) << "Failed to read test image.";
    api->SetImage(image);
    int orient_deg;
    float orient_conf;
    const char* script_name;
    float script_conf;
    bool detected = api->DetectOrientationScript(&orient_deg, &orient_conf, &script_name, &script_conf);
    ASSERT_FALSE(!detected) << "Failed to detect OSD.";
    printf("************ Orientation in degrees: %d, Orientation confidence: %.2f\n"
           "             Script: %s, Script confidence: %.2f\n",
           orient_deg, orient_conf,
           script_name, script_conf);
    EXPECT_EQ(expected_deg, orient_deg);
    api->End();
    pixDestroy(&image);
  }

  class OSDTest : public TestClass ,
      public ::testing::WithParamInterface<std::tuple<int, const char*, const char*>> {};
  
  TEST_P(OSDTest, MatchOrientationDegrees) {
  OSDTester(std::get<0>(GetParam()), std::get<1>(GetParam()), std::get<2>(GetParam()));
  }
  
  INSTANTIATE_TEST_CASE_P( TessdataEngEuroHebrew, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(0),
                        ::testing::Values(TESTING_DIR "/phototest.tif",
                                          TESTING_DIR "/eurotext.tif",
                                          TESTING_DIR "/hebrew.png"),
                        ::testing::Values(TESSDATA_DIR)));
                        
  INSTANTIATE_TEST_CASE_P( TessdataBestEngEuroHebrew, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(0),
                        ::testing::Values(TESTING_DIR "/phototest.tif",
                                          TESTING_DIR "/eurotext.tif",
                                          TESTING_DIR "/hebrew.png"),
                        ::testing::Values(TESSDATA_DIR "_best")));
                        
  INSTANTIATE_TEST_CASE_P( TessdataFastEngEuroHebrew, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(0),
                        ::testing::Values(TESTING_DIR "/phototest.tif",
                                          TESTING_DIR "/eurotext.tif",
                                          TESTING_DIR "/hebrew.png"),
                        ::testing::Values(TESSDATA_DIR "_fast")));
                        
  INSTANTIATE_TEST_CASE_P( TessdataFastRotated90, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(90),
                        ::testing::Values(TESTING_DIR "/phototest-rotated-R.png"),
                        ::testing::Values(TESSDATA_DIR "_fast")));
                        
  INSTANTIATE_TEST_CASE_P( TessdataFastRotated180, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(180),
                        ::testing::Values(TESTING_DIR "/phototest-rotated-180.png"),
                        ::testing::Values(TESSDATA_DIR "_fast")));
                        
  INSTANTIATE_TEST_CASE_P( TessdataFastRotated270, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(270),
                        ::testing::Values(TESTING_DIR "/phototest-rotated-L.png"),
                        ::testing::Values(TESSDATA_DIR "_fast")));
                        
  INSTANTIATE_TEST_CASE_P( TessdataFastDevaRotated270, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(270),
                        ::testing::Values(TESTING_DIR "/devatest-rotated-270.png"),
                        ::testing::Values(TESSDATA_DIR "_fast")));
                        
  INSTANTIATE_TEST_CASE_P( TessdataFastDeva, OSDTest, 
                        ::testing::Combine(
                        ::testing::Values(0),
                        ::testing::Values(TESTING_DIR "/devatest.png"),
                        ::testing::Values(TESSDATA_DIR "_fast")));
                        
}  // namespace