TesseractEngine - Overview

Robin Sale — Thu, 06 Dec 2012 04:04:00 GMT

Abstract:

TesseractEngine

The Tesseract Engine, class name TesseractEngine, is an open source engine that Atalasoft provides without charge for those who purchase the OCR Package. It is a commercial quality OCR engine originally developed at HP between 1985 and 1995. HP and UNLV open-sourced this engine in 2005.

Features

The Tesseract engine is fast and runtime royalty free although it is not quite as powerful as the other engines supported by DotImage. In particular, it lacks segmentation and it is not very good at recognizing low quality documents.

Supported Languages

The TesseractEngine supports the following languages:

Dutch
English
French
German
Italian
Portuguese
Spanish

Supported Output Formatters

The TesseractEngine supports the following output formatters and provides a structure that allows you to build your own.

Text
PDF

Deployment

The assemblies listed below are required for deployment.

Atalasoft.dotImate.OCR.Tesseract
Atalasoft.dotImage
Atalasoft.dotImage.OCR
Atalasoft.dotImage.Lib
System
System.Data
System.Drawing

Additionally, the Tesseract language files must be accessible. These are automatically placed in the DotImage directory during toolkit installation. When deploying, you must either copy the OcrResources to your application directory or tell the engine their location explicitly by passing it into th

Deploy a project using OCR

Robin Sale — Tue, 03 Jul 2012 09:55:00 GMT

Abstract:

Note: This information is specific to DotImage at the time it was written and may change slightly in future versions.

Every OcrEngine has different requirements in terms of how it is deployed. Atalasoft has tried to formalize this process as much as possible as well as to provide guidelines on the mechanism for deployment. Licensing is covered in another topic. This topic covers how to ensure that an OcrEngine will be able to start and will be able to find its own resources.

In your SDK installation, you will find a folder named "OcrResources". This folder is the general folder for all supported OCR engines. Within it you will see a structure like this:

EngineManufacturer1
<Files>
EngineManufacturer2
<Files>
...
EngineManufacturerN
...

In general, most of the handling of loading and locating resources is managed by Atalasoft or by the engine itself and does not require work by the client, but in custom situations, there may be work to be done by the client to handle this.

To sort this out, let's start with a few definitions:

engine resources folder - this is the folder which contains the OCR Engine's resource files
OCR resources folder - the top level folder of all OCR Engine resources, called "OcrResources"
application folder - the folder where your application is installed
assembly folder - the folder which contains the dotImage assembly files (ie, Atalasoft.dotImage.Ocr.dll), this ma

Atalasoft Knowledgebase : OCR : Tesseract

TesseractEngine - Overview