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#tess-two

A fork of Tesseract Tools for Android (tesseract-android-tools) that adds some additional functions. Tesseract Tools for Android is a set of Android APIs and build files for the Tesseract OCR and Leptonica image processing libraries.

This project works with Tesseract v3.01. Source code for Tesseract 3.01 and the other dependencies is included in the tess-two/external folder.

The tess-two subdirectory contains tools for compiling the Tesseract, Leptonica, and JPEG libraries for use on the Android platform. It contains an Eclipse Android library project that provides a Java API for accessing natively-compiled Tesseract and Leptonica APIs.

This project adds the following methods on top of tesseract-android-tools r6 to enable retrieving bounding boxes for words and characters recognized using OCR:

  • TessBaseAPI::GetRegions()
  • TessBaseAPI::GetTextlines()
  • TessBaseAPI::GetWords()
  • TessBaseAPI::GetCharacters()

Note: GetTextlines(), GetWords() and GetCharacters() work well, but I have not gotten good results from Tesseract when calling GetRegions().

eyes-two

The eyes-two subdirectory contains a second, separate library project with additional image processing code copied from the eyes-free project without modifications. It includes native functions for text detection, blurriness detection, optical flow detection, and thresholding. Building eyes-two is not necessary for using the Tesseract API.

While I haven't tested all the Eyes-two code, I've bundled it in this project alongside tess-two for convenience due to its dependency on Leptonica.

Build

This project is set up to build on Android SDK Tools r16 and Android NDK r7. The build works on Ubuntu 11.04. It's been reported to not work on Ubuntu 11.10 (Issue #6).

To build tess-two, run the following commands in the terminal:

git clone git://github.com/rmtheis/tess-two tess
cd tess/tess-two
ndk-build
android update project --path .
ant release

To build eyes-two, additionally run the following:

cd ../eyes-two
ndk-build
android update project --path .
ant release

After building, the tess-two and eyes-two projects can be imported into Eclipse using File->Import->Existing Projects into Workspace.

License

This project is licensed under the Apache License, Version 2.0

/*
 * Copyright 2011 Robert Theis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

This project contains third party software in "tess-two/external" with separate license agreements:

  • Tesseract 3.01 (Modified to add TessBaseAPI::GetCharacters())
  • Leptonica 1.68 (Unmodified)
  • LibJPEG 6b (Unmodified)