Voltage Logger

About

The idea is to use a webcam filming the screen of a multimeter is order to log the data. Afterwards, the pictures are OCRed and reduced to text.

Use mplayer to crop and dump

View it:

mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0 -vf crop=360:190:75:120 -vo x11

Record it as jpg:

mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0 -vf crop=360:190:75:120 -vo jpeg

Examples of LCD captures

lcd-multimeter-008.jpg
lcd-multimeter-202.jpg
lcd-multimeter-899.jpg

Convert to B&W

lcd-multimeter-040-bw.jpg

OCR the LCD

TODO