Generally speaking, the domestic equipment used are photographed and then converted to text storage through image recognition. The single withdrawal function of the equipment, then generally need to dig the money channel above the lens, through the lens to obtain the image and then converted, the domestic do this in Nanjing has a called the speed of the Bida. In addition, incidentally, a move these devices to take pictures are backlit, that is to say, a time imaging are two sides of the image. ATM should be the common said deposit and withdrawal machine, banknotes in the deposit and withdrawal process, through the identification module to determine the authenticity of the same time through the high-speed photo, intercept the crown of that particular area of the image to identify the conversion and uploaded to the upper level. As a recognition module, which is also built-in memory unit for storing banknote data, not only can record the crown size, in fact, even the entire banknote photo can be saved, but this is too much memory consumption, and processing speed will be affected; therefore, it will be limited to the number of photos can be stored in the entire banknote.