1 files changed, 65 insertions, 0 deletions
diff --git a/cpp/recognizer.cpp b/cpp/recognizer.cpp
new file mode 100644
index 0000000..6f19322
--- /dev/null
+++ b/cpp/recognizer.cpp
@@ -0,0 +1,65 @@
+#include <leptonica/allheaders.h>
+#include <tesseract/baseapi.h>
+
+#include "../include/recognizer.h"
+
+void Recognizer::initializeTesseract() {
+  tesseract = new tesseract::TessBaseAPI();
+  tesseract->SetPageSegMode(tesseract::PSM_AUTO);
+
+  if (tesseract->Init(nullptr, "eng", tesseract::OEM_LSTM_ONLY))
+    fail("Could not initialize tesseract.");
+}
+
+void Recognizer::recognize(Pix *image) {
+  if (failed)
+    return;
+
+  tesseract->SetImage(image);
+  tesseract->SetRectangle(x, y, width, height);
+  if (tesseract->Recognize(0) != 0)
+    fail("tesseract recognize failed");
+}
+
+std::vector<OCRMatch> Recognizer::getResults() {
+  std::vector<OCRMatch> results;
+
+  if (failed)
+    return results;
+
+  tesseract::ResultIterator *iterator = tesseract->GetIterator();
+  if (iterator == 0)
+    return results;
+
+  do {
+    auto match = fetchMatch(iterator);
+    if (match != nullptr)
+      results.push_back(*match);
+  } while (iterator->Next(ITER_LEVEL));
+
+  delete iterator;
+
+  return results;
+}
+
+OCRMatch *Recognizer::fetchMatch(tesseract::ResultIterator *iterator) {
+  if (iterator->Confidence(ITER_LEVEL) < CONFIDENCE_THRESHOLD)
+    return nullptr;
+
+  const char *word = iterator->GetUTF8Text(ITER_LEVEL);
+
+  if (word == nullptr || strlen(word) < MIN_CHARACTER_COUNT)
+    return nullptr;
+
+  int x1, y1, x2, y2;
+  iterator->BoundingBox(ITER_LEVEL, &x1, &y1, &x2, &y2);
+
+  return new OCRMatch(
+      {(int)(x1 / image::scaleFactor), (int)(y1 / image::scaleFactor),
+       (int)(x2 / image::scaleFactor), (int)(y2 / image::scaleFactor), word});
+}
+
+void Recognizer::fail(const char *msg) {
+  this->failed = true;
+  std::cerr << msg << std::endl;
+}