Embedded System for Automatic Optical Meter Reading

Sustav za automatsko očitavanje izveden je ugradbenim računalom Raspberry Pi 3 (sa UNIX operacijskim sustavom) i standardnom web kamerom spojenom na USB port računala. Programska potpora sastoji se od ‘bash’ skripte i glavnog programa za očitavanje: Python skripte. Program prolazi kroz nekoliko koraka: okidanje slike i pokretanje programa za očitavanje (‘bash’ skripta), te predobrada, lociranje znamenki i očitavanje znamenki (Python skripta). Sustav periodično okida slike i očitava brojeve te ih ispisuje na terminal. Frekvencija okidanja slike je podesiva. Sustav funkcionira samo za sedam segmentne pokaznika te zahtjeva instaliranu potporu na računalu: Python interpreter i OpenCV biblioteka koja sadrži funkcije za obradu slike.System for automatically sensing is carried out by embedded computer Raspberry Pi 3 (with UNIX operating system) and standard web cam connected to computer USB port. Software consists of 'bash' script and main sensing program: Python script. Program goes through several steps: picture triggering and launching sensing program ('bash' script), pretreatment, locating digits and sensing digits (Python script). System periodically triggers pictures and senses numbers which are then printed on the terminal. The picture triggering frequency is adjustable. The System functions only for seven segment pointing devices and requires installed computer support : Python interpreter and OpenCv library which contains functions for picture editing