Design Of An Auto-recharge System For Mobile Phone Rechargeable Card

Nowadays, mobile Phone has become the most used communication tool, in order to keep continuation of communication, it is required to recharge for the mobile phone. There are kinds of way available to recharge. Among them, a rechargeable card is widely used. To use a rechargeable card, one should follow certain sequence, scrape off the password mask, dial up a specified number and enter a lot of number string during the call. It is awful, time-consuming, strenuous and fallible during entering number.Address to the issue, an auto-recharge system for rechargeable card is designed in this dissertation. With the system, all that the user need to do is scraping off the mask, putting it into the scanner, and entering the phone number to recharge. Afterwards, the system will finish recharge itself automatically. The system comprises the scanner controlling sub-system, image preprocessing & OCR sub-system, and GSM wireless communication sub-system. The main tasks finished in this paper include:1. Encapsulate the scanner TWAIN interface into a class named CTwain, and using it to scan the rechargeable card image into computer.2. Encapsulate the DIB (device independent bitmap) into a class named CDib, preprocess the card image, by image translation and rotation,template matching,the card password region catching,filter,thinning, binarization, to get the card password region ready for OCR process.3. Compare several ways of OCR and their effects, select MS office OCR interface to accomplish card password number string recognition.4. Encapsulate the AT directive operation into a class CATModem for wireless communication modem module, and through the COM, dial up the specified number to recharge for the phone number the user provides.5. Analyze the system data flew, design a convenient user interface.