Pcb's Barcode Identification And Applications

In order to solve the problems of existing scanner in the circuit board and shipping packaging production line, improve the degree of automation of production line, needs to make use of video technology in the design of barcode recognition, thus spread out the applications research of barcode recognition.By analyzing the charateristics of barcode and according to the system of internal communications relations, the system structure will be divided into two parts: the structure between video card and PC, and the structure among video cards. The system uses the video cards-switch-computer architecture, and uses the unshielded twisted pair to transmit the data of video cards through the switch to PC, formes a LAN controlling video cards from PC. PC accesses to the video cards with LAN based on IP for sending control orders or reading image data. In order to achieve the interaction of information between software and hardware, the structure among video cards with the use of optical fiber to form a closed loop, constitutes a structure of one PC controlling video cards, uses for producing synchronous exposure signal and controlling synchronous exposure of video cards. In order to meet the requirements of detection speed and accuracy, make full use of the communications structure and characteristics of the DSP, design the programs of hardware and software respectively. In the DSP programming, image storage module is designed for accessing and compressing image data, so that cooperates with recognition software. And it reduces the time consumption while transmitting image data, and meets the real-time requirement of system. System software design is divided into six modules: interface, set parameters, command control decoders, automated process control, image scanning and barcode decoding. Make use of command decoding method to form order-cross-channel to ensure that to change user interface depending on the different case needs without affecting the system for dealing with barcode identification.After testing different types of barcodes that the barcode recognition is expected to meet the design requirements and can be successfully integrated with other devides. And also this system has some reference value for the development of two-dimensional barcode indentification system.