There are known issues with TIFF files and limited support for PDF OCR. Leptonica has good general image compatibility but throws many console warnings and errors. PIX objects are not managed memory - and failure to handle them with care in C# results in memory leaks. Only accepts Leptonica PIX image format which is an IntPtr C++ object in C#. IronOcr.OcrResult Result = Ocr.Read(Input) Ĭopy code to clipboard VB C# Image Compatibility Google Tesseract in. there are dozens more filters, but most users wont need them Input.Deskew() //fixes rotation and perspective Using (var Input = new //fixes digital noise Users often achieve 99.8-100% accuracy with minimal configuration. Generally, this needs to be developed on a case-by-case basis for each type of document you are trying to deal with and can take weeks of development. This is normally done with Photoshop batch scripts or advanced ImageMagick usage. To use Tesseract when we are using scanned or photographed documents where the images are not digitally perfect like screenshots, we need to perform image preprocessing. Tesseract is a free library optimal for reading straight and perfect text of standardized typefaces. In addition, Tesseract will also take a very long time to process that document before giving you back nonsense information.Ī simple document that is very easy to read by the eye cannot be read by Tesseract well. If Tesseract encounters an image that is rotated, skewed, is of a low DPI, scanned, or has background noise, it becomes almost impossible for Tesseract to get data from that image. The problem is that in the real world, that is not what we have. That is why Tesseract is good at reading perfect documents. Tesseract as a library was designed for perfect documents where a machine printed out a high-resolution text to a screen and then read it. Using (var Input = new Result = Ocr.Read(Input) Ĭopy code to clipboard VB C# Accuracy Google Tesseract in. Var Ocr = new IronTesseract() // nothing to configure To date: IronTesseract is the only known implementation of Tesseract5 for. There is little else to say other than it has been done right. Runs Tesseract 5 ( as well as 4 and 3) out of the box on Windows, macOS, Linux, Azure, AWS, Lambda, Mono, and Xamarin Mac with little or no configuration.
In addition, free C# API wrappers on GitHub may be years behind or incompatible. The MinGW cross-compile chain is not successful at producing Windows interop binaries as of today.
Installing Tesseract 5 for C# for free requires manually modifying and compiling Leptonica and Tesseract for Windows. The latest builds of Tesseract 5 have never been designed to compile on Windows. Up To Date & Maintained Google Tesseract with C# NET Standard 2.0 and above (including 3.x &. It supports these kinds of Visual Studio projects to add optical character recognition in C#: NET using a simple C# API using Tesseract. There are no native dlls or exes to install. With IronOCR, all Tesseract installation happens entirely using the NuGet Package Manager.
It is easy to install using NuGet Package Manager to extract text from images and PDF files using Optical Character Recognition. We also have to find, download and manage C++ DLLs and EXEs we may not understand, and deploy them in environments where permissions may not allow them to run.
Free C# wrappers for these may be years behind the edge. We may need to ensure that Visual C++ runtimes are installed and even compile Tesseract ourselves to get the latest version. It requires us to choose the bittiness of our application, meaning that we may only deploy to 32 or 64-bit targets.
NET - and has poor cross-platform and Azure compatibility. When using Tesseract Engine, most of us are working with a C++ library.