- capture photo using RPi camera module/webcam
- determine if photo is oriented correctly
- determine that image contains text
- preprocess the photo to white out non-text, make it greyscale, fix contrast, etc
- use tesseract ocr to extract text
- use spellcheck library to spellcheck
- convert text to speech
http://www.fmwconcepts.com/imagemagick/textcleaner/index.php https://raw.githubusercontent.com/jasonlfunk/ocr-text-extraction/master/extract_text https://stackoverflow.com/questions/28935983/preprocessing-image-for-tesseract-ocr-with-opencv https://www.webuildinternet.com/2016/10/01/kraken-the-unknown-python-ocr-system/
https://github.com/tesseract-ocr/tesseract/wiki https://github.com/madmaze/pytesseract
https://pypi.python.org/pypi/pygtkspellcheck https://pypi.python.org/pypi/Whoosh/ https://pypi.python.org/pypi/autocorrect/0.1.0 https://github.com/rfk/pyenchant http://norvig.com/spell-correct.html
https://launchpad.net/python-espeak https://pypi.python.org/pypi/pyTTS http://pythonprogramminglanguage.com/text-to-speech/ https://pypi.python.org/pypi/pyttsx
OCR TTS overview/architecture - https://sci-hub.io/10.1016/j.protcy.2014.10.135 State of the art, shaking image - https://sci-hub.io/10.1109/TMECH.2013.2261083 Better Indian RPi OCR - https://www.ijareeie.com/upload/2016/may/17_Image.pdf Indian RPi OCR - https://arxiv.org/pdf/1405.6627.pdf Another Indian RPi OCR - http://research.ijcaonline.org/ncpsia2015/number4/ncpsia17270.pdf
https://www.adafruit.com/product/1565
sudo apt-get install python-distutils-extra tesseract-ocr tesseract-ocr-eng libopencv-dev libtesseract-dev libleptonica-dev python-all-dev swig libcv-dev python-opencv python-numpy python-setuptools build-essential espeak tesseract-ocr-dev