open-ocr-dotnet's Introduction

open-ocr-dotnet

A small lightweight C# client library for the amazing open-ocr project.

Prerequisites

All you need is a running instance of open-ocr.

Install in your project

Install the nugetpackage:

Install-Package open-ocr-dotnet -Pre

Usage

Basic example

Get an Instance of the open ocr client service

In minimal config you only need to provide the host url. The default port (9292) will be used. Default language is eng.

var service = new OpenOcrService(ocrhosturl);
var service = new OpenOcrService(ocrhosturl,ocrport);
var service = new OpenOcrService(ocrhosturl,ocrport,options);

Customize settings (optional)

string imagetodetect = @"http://bit.ly/ocrimage";
string ocrhosturl = @"http://PLACE_HOST_IP_HERE";
string ocrport = "HOSTPORT";
OpenOcrOptions options = new OpenOcrOptions {
    Language = EngineLanguage.eng,
    EngineOptions = new EngineOptions {
        Engine = OcrEngine.Tesseract
}

Analyze image from Url

OpenOcrService service = new OpenOcrService(ocrhosturl, ocrport, options);
string resultFromUrl = await service.ProgressImageFromUrl(imagetodetect);

Analyze image from Filesystem

byte[] fileBytes = File.ReadAllBytes(@"PATHTOIMAGE\ocr_test.png");
string resultlocalFile = await service.ProgressImage(fileBytes);

Advanced stuff

Use a preprocessor

It is important that you first enable the preprocessor in your open-ocr instance https://github.com/tleyden/open-ocr/wiki/Stroke-Width-Transform#start-an-additional-worker

OpenOcrOptions optionsSample = new OpenOcrOptions {
    Language = EngineLanguage.eng,
    EngineOptions = new EngineOptions {
        Engine = OcrEngine.Tesseract
    },
    Preprocessors = new[] {
        Preprocessor.StrokeWidthTransform,
        "super-fancy-new-preprocessor"
    }
};