AngelHack is not for the faint of heart. It lasts 24 hours, has a lot of sponsor backing and a ridiculous amount of Red Bull. Despite this being my second year at this, it turned out to be just as exhausting and exciting as the last.
I went in looking for a team to build with and ended up with some folks who really knew their backend/web scripts well and could back me up on the Android side of things.
Our idea was to make a business card scanner for SMBs. It would be free for scanning cards and adding them to your contacts - which is a good achievement in itself, considering most current apps are paid. Where we would be able to make a difference is that it would tell the business where their cards were being scanned and provide more analytics around the paradigm.
I built the Android app for the front end of this service. The input could be a stored picture or one taken from within the app. The app called on the backend we built and served up JSON for the app to consume. We managed to pull name, company, phone number and email addresses from most regular-looking business cards with good accuracy. Under the hood, we used sponsor HP's IdolOnDemand API for entity extraction and OCR document scanning.