Add more unittests from Google

They were provided by Jeff Breidenbach <[email protected]>.

Signed-off-by: Stefan Weil <[email protected]>

unittest/applybox_test.cc

@@ -0,0 +1,122 @@
+
+#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