Bib recognition Photos - OCR

I am looking for a solution to OCR (Optical Character Recognition) From an image file (photo evidence athlete in running or cycling), the software should automatically identify the number). The images are in JPG, PNG. Resolution: (about 1700x2400 pixels, but might be bit smaller or bigger) The numbering of athletes varies with each event, ie are not standardized and can vary the number of the source, size, color, background color, sometimes skewed, more than one number on page occurs ... Process should look like this (needs to be covered by solution): #1 User uploads files through web interface to ftp (dedicated space) #2 after successful upload, OCR is triggered and performed (does not have to be real-time) #3 Found numbers are written to the database table (MySQL) + status of scanning is change in db (from to be "to-be-scanned" -> processed -> "finished") Demo would be appreciated (ie. what technology, additional details) I do not expect "working" demo Please feel free to ask for more details