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As in title. Where to find good feature engineering sources ? State of art techniques ?

Hi. I am looking for million dollar (GBP ( PLN worst case scenario)) idea.I need money. I am 29, I am originally from Poland, but I have lived last 10 yrs in UK ( where I studied AI and electronics ). Now Im back to Poland (I moved here because of my beloved woman).I am trying my best to live and work here and also pay the student loan in UK... but it goes bad. Interests are rising and the rope...

I need help with automatic data extraction from invoice scans and images. The thing is, I would like to develop automatic system so it knows where is the invoice number, price, date, etc.... The problem is that, each invoice has different layout and I cannot figure out any rule for such system. Do you have some ideas ? or could you point me into some direction ? Thank you