ubii-processing-module-ocr

Tesseract OCR for Ubi Interact

Requirements

• tesseract OCR Engine with appropriate language packs (>= 4.0.0)

• opencv (some of the modules try to improve OCR performance with additional preprocessing, in the future this might become an optional requirement)

• numpy

• tesserocr

  :warning: On windows tesserocr can't be installed from PyPi. Windows builds for tesserocr are available for some python versions. Only python version >=3.7 < 3.8 is supported by both tesserocr and the ubi-interact-python node on Windows. Tesseract 5.+ should be compatible with Tesseract 4.0.0 (which is used for the Windows builds).

Known Issues

• The processing modules which use opencv seem to sometimes randomly crash under Windows
• Processing Frequency depends on the module implementation. Typically TesseractOCR_EAST allows for a slightly higher processing frequency and is run at 10fps while the TesseractOCR_PURE module is run at 5fps.

BSD 3-Clause License

Copyright (c) 2022, Maximilian Schmidt (ga97lul@mytum.de) All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.