Design And Implementing Of The Visual System And Software In RFID Tag Packing Equipments

Recently increasingly high performance and production of RFID tag shave been requiredin the market. RFID packaging equipment is the core equipment for the manufacturing ofRFID tags, and its performance will have a huge impact on the output. Visual technology asone of the key technologies in the RFID tag packaging equipment has seriously hampered thepackaging accuracy, efficiency and stability. Due to the late start of the domestic research, thetechnology is relatively backward. In this paper, we studied the visual positioning andsoftware system based on the RFID tag packaging equipment researched by our lab.Aiming to the demands of high precision and efficiency of the RFID tag packagingequipment, we completed the demand analysis, realized the aims of each module combingwith the process steps, then studied the principles, designed the overall architecture andaccomplished the selection about CCD hardware and lighting systems in the visual system.We presented an algorithm based on center location of dot array and automatic sorting,and realized the calibration in any state combined with the MIL software calibration module.The fast positioning center method based on improved Hough transform is proposed, andcould be used to correct the chip posture based on the white circles in the corner.Based on the system working requirements, we completed the software requirementsanalysis and the overall software architecture, including system threads planning, detailedprocess design of each module, data structure design and interface design. The interfacepackage functions are designed for the cameras and control cards based on the idea of designin module.Based on the customized high-precision calibration block, the vision position algorithmwas validated feasible. The experiment results indicate the vision system accuracy, dispensingaccuracy and packaging accuracy reach to2.6μm,29.2μm and20μm, respectively. The visionalgorithm could satisfy the demands of visual positioning accuracy in RFID tag packagingequipment and work in reality successfully.