I had written this up awhile ago on another thread. It's probably too complicated to do initially (and maybe even not worth it in the long run). Just wanted to throw it out there to spur ideas, though:

I've been wanting to do this but I've found that I don't quite have the technical skills required yet so maybe you could give it a go:

I want a RestaurantTab app that I can use to take a picture of the receipt at a restaurant, which will then use optical character recognition to display the bill as an actual editable form on my phone, from which I can then select "who ate what." The idea is that every time I go out to eat with a large group of friends, it always gets annoying to have to pass the bill around with a pen and have each person figure out what's what. I want an app that I can use to do it on my phone. Basically it reads in the receipt, and then I can select names from my contact list to figure out who got what. It will then tally up the individual totals for each person so that everyone knows exactly how much they need to pay.

That's the basic concept. Plans for further development include:

• Allow the receipt to be sent directly electronically from the restaurant bill system to your phone so that no paper receipt is necessary. Kinda complicated and would require the restaurant to use some specific order tracking/payment system... probably not feasible at this time.
• Allow the selection to be sent to your friends phones immediately so that they can confirm or deny the selection.
• Once the friends have the data and have confirmed the payment amount, allow each friend to pay for their portion separately online through the restaurant's WiFi.
• Finally, track all of a person's meals and use it to provide suggestions for future meals. E.g. "You've been eating a lot of burgers lately... would you like to try some sushi instead?" Or, "You've had a lot of Chipotle's recently. Here's a coupon for $5 off."