Abstract: Disclosed is a banknote processing method and device. The banknote processing method includes: scanning a substrate through the image acquisition module while acquiring banknote image data through an image acquisition module to obtain substrate image data; acquiring a characteristic value of the substrate image data; calculating a change value of the characteristic value of the substrate image data relative to a reference characteristic value; judging whether the change value is greater than a preset threshold value; and configuring parameters of the image acquisition module if it is judged that the change value is greater than the threshold value.

Abstract: Disclosed is a banknote processing method and device. The banknote processing method includes: scanning a substrate through the image acquisition module while acquiring banknote image data through an image acquisition module to obtain substrate image data; acquiring a characteristic value of the substrate image data; calculating a change value of the characteristic value of the substrate image data relative to a reference characteristic value; judging whether the change value is greater than a preset threshold value; and configuring parameters of the image acquisition module if it is judged that the change value is greater than the threshold value.

Abstract: The invention discloses a printer with a Universal Serial Bus (USB) interface, and its driver installing method and system, wherein the printer with the USB interface includes a USB interface and a printing mechanism and further includes: a controller, and a first memory connected with the controller and storing a driver of the printer, wherein the first memory further stores a device identification, wherein the type of the device identification includes a memory device identification and a printing device identification. By using the invention, a driver of a USB device can be installed conveniently.