L_OcrEngine

LEADTOOLS has defined the following data types for referencing an OCR engine handle:

Data Type Definition and Usage
L_OcrEngine Defined as Handle, used as a handle of the OCR engine.

Example

L_INT EXT_CALLBACK MyOcrProgressCallback(L_OcrProgressData* data, L_VOID* /*userData*/) 
{ 
   if (data->Percentage == 0) 
      std::cout << "--------------------------\n"; 
 
   std::wcout << L"Page:" << data->CurrentPageIndex  << L"(" << data->FirstPageIndex << L":" << data->LastPageIndex << L") "  
             << data->Percentage  << L"% Operation: ";  
    
   switch (data->Operation) 
   { 
   case L_OcrProgressOperation_LoadImage: 
      std::wcout << L"L_OcrProgressOperation_LoadImage" << std::endl; 
      break; 
   case L_OcrProgressOperation_SaveImage: 
            std::wcout << L"L_OcrProgressOperation_SaveImage" << std::endl; 
      break; 
   case L_OcrProgressOperation_PreprocessImage: 
            std::wcout << L"L_OcrProgressOperation_PreprocessImage" << std::endl; 
      break; 
   case L_OcrProgressOperation_AutoZone: 
            std::wcout << L"L_OcrProgressOperation_AutoZone" << std::endl; 
      break; 
   case L_OcrProgressOperation_Recognize: 
            std::wcout << L"L_OcrProgressOperation_Recognize" << std::endl; 
      break; 
   case L_OcrProgressOperation_SaveDocumentPrepare: 
            std::wcout << L"L_OcrProgressOperation_SaveDocumentPrepare" << std::endl; 
      break; 
   case L_OcrProgressOperation_SaveDocument: 
            std::wcout << L"L_OcrProgressOperation_SaveDocument" << std::endl; 
      break; 
   case L_OcrProgressOperation_SaveDocumentConvertImage: 
            std::wcout << L"L_OcrProgressOperation_SaveDocumentConvertImage" << std::endl; 
      break; 
   case L_OcrProgressOperation_Formatting: 
            std::wcout << L"L_OcrProgressOperation_Formatting" << std::endl; 
      break; 
   case L_OcrProgressOperation_RecognizeOMR: 
            std::wcout << L"L_OcrProgressOperation_RecognizeOMR" << std::endl; 
      break; 
   } 
 
   return SUCCESS; 
} 
 
L_INT L_OcrEngineExample() 
{ 
   BITMAPHANDLE bitmap = { 0 }; 
   L_OcrEngine ocrEngine = NULL; 
   L_OcrPage ocrPage = NULL; 
   L_OcrDocumentManager ocrDocumentManager = NULL; 
   L_OcrDocument ocrDocument = NULL; 
    
 
   // Create an instance of the engine 
   L_INT retCode = L_OcrEngineManager_CreateEngine(L_OcrEngineType_Advantage, &ocrEngine); 
   if(retCode != SUCCESS) 
      return retCode; 
 
   // Start the engine using default parameters 
   retCode = L_OcrEngine_Startup(ocrEngine, NULL, OCR_ADVANTAGE_RUNTIME_DIR); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // Load an image to process 
   retCode = L_LoadBitmap(MAKE_IMAGE_PATH(L_TEXT("Ocr1.tif")), &bitmap, sizeof(BITMAPHANDLE), 0, ORDER_RGB, NULL, NULL); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // Add an image to OCR page. Transfer ownership of the bitmap to the page 
   retCode = L_OcrPage_FromBitmap(ocrEngine, &ocrPage, &bitmap, L_OcrBitmapSharingMode_AutoFree, MyOcrProgressCallback, NULL); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // We have a valid page and bitmap ownership has transfered. So, we do not need to free the bitmap anymore. 
   // Bitmap will be freed when ocrPage is destroyed. 
   bitmap.Flags.Allocated = 0; 
 
   // Automatically find areas/zones on the page where text is located 
   retCode = L_OcrPage_AutoZone(ocrPage, MyOcrProgressCallback, NULL); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // Recognize the page 
   // Note: Recognize can be called without calling AutoZone or manually adding zones.  
   // The engine will check and automatically auto-zones the page 
   retCode = L_OcrPage_Recognize(ocrPage, MyOcrProgressCallback, NULL); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   retCode = L_OcrEngine_GetDocumentManager(ocrEngine, &ocrDocumentManager); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // Create an OCR document 
   retCode = L_OcrDocumentManager_CreateDocument(ocrDocumentManager, &ocrDocument, L_OcrCreateDocumentOptions_AutoDeleteFile, NULL); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // In Document File Mode, add OcrPage to OcrDocument after recognition 
   retCode = L_OcrDocument_AddPage(ocrDocument, ocrPage); 
   if(retCode != SUCCESS) 
      goto CLEANUP; 
 
   // Adding the page to a file based document will take a snap shot of the recognition data and store it in the document. At this 
   // point, the page is no longer needed. So destroy it to free up memory not used anymore 
   L_OcrPage_Destroy(ocrPage); 
   // Set the handle to NULL so we do not free it in our clean-up code 
   ocrPage = NULL; 
 
   // Save the document we have as PDF 
   retCode = L_OcrDocument_Save(ocrDocument, MAKE_IMAGE_PATH(L_TEXT("Ocr1.pdf")), DOCUMENTFORMAT_PDF, MyOcrProgressCallback, NULL); 
 
CLEANUP: 
   if(bitmap.Flags.Allocated) 
      L_FreeBitmap(&bitmap); 
 
   if(ocrPage != NULL) 
      L_OcrPage_Destroy(ocrPage); 
 
   if(ocrDocument != NULL) 
      L_OcrDocument_Destroy(ocrDocument); 
 
   if(ocrEngine != NULL) 
      L_OcrEngine_Destroy(ocrEngine); 
 
   return retCode; 
} 

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LEADTOOLS OCR Module - LEAD Engine C API Help