Digit Recognition project based on Raspberry Pi

• Python 2.7.x
• Tesseract-OCR - http://code.google.com/p/tesseract-ocr/wiki/ReadMe
  • Compilation details http://code.google.com/p/tesseract-ocr/wiki/Compiling
• OpenCV 2.4.3 - http://mitchtech.net/raspberry-pi-opencv/
• Pillow (Imaging Library) - https://pypi.python.org/pypi/Pillow/

of course Raspberry Pi with Debian or Raspbian latest updates.

• Download / Clone / Unpack
• Create dirs:
  • ~mkdir capture
  • ~touch data.txt
  • ~cd capture
  • ~mkdir crop
  • ~mkdir clean
• Run : ./capture.sh

Changind sleep value in camera.sh you can manipulate with script running intervals in seconds.

• captureImage() - captures and image (352x288) with light gain value (0.1 .. 1)(Note: GAIN support by device)
  • Captured image coverted to GRAY, threshhold applied, inverted and saved to /caputre/TIMESTAMP_capture.png;
• cropImage() - crops captured image with a specified box and saves to /caputre/crop/cropped_TIMESTAMP.png;
• cleanImage() - cleans black spaces between digits and saves to /caputre/clean/cleaned_TIMESTAMP.png (Note: use if needed);
• recognizeData() - recognizes data from each cleaned file, *.TXT results in /capture/clean/output_TIMESTAMP.txt
• Several verification steps:
  • if valid string recognized -> added to dataList -> converted to INT -> added to numberList;
  • if 10 not valid attempts -> break execution;
  • if numberList not EMPTY -> mean value computed and checked with previous result;
  • if mean value exists -> sent to TELECONTROL SERVER.
• Cleaning opperations performed, to clean /capture/ folder.