I've got a device I purchased which displays voltage, amperage, etc. for the connected device. I did not build the device, nor does the manufacture provide any type of interface or storage options. It simply displays "real-time" data on a small display.
I would like to store the data such that I can review/understand the time history. The easiest way I could think of doing this is to place a camera in front of the digital display, do some image processing to recognize the digits, then save the corresponding image timestamp and value to generate a time series.
I'm wondering if this solution already exists? If so, can you help steer me in the right direction? I've tried to search the internet, but it's hard to get the "key words" right to provide results specific to my application. I know there are tools for "image processing to recolonize the digits", but I'm not aware of any specific ones. Can you give some examples? I'm not looking for a full blown text interpreter...mainly just digits 0-9.
I can't think of any other way to do this, so I'm open to suggestions (assume I can't hack into the device).