| With the development of networking technology,photoelectric sensor and RFID(radio frequency identification)technology have been rapidly developed and widely applied.Especially in the field of UHF(ultra high frequency)RFID automatic recognition,photoelectric sensor technology has the characteristics of non-contact,high accuracy and high degree of automation,which plays an important role in obtaining recognition distance,recognition rate and angle parameters in the field of RFID technology.At present,RFID photoelectric sensor system faces various factors in complex environment in practical applications(temperature,liquid,tag distribution)interference,greatly affects the dynamic performance of the RFID system identification.Therefore,image visualization of the space electromagnetic radiation as well as the visual image processing algorithms to carry out the reverse optimization design of RFID system provide a new approach to improve the reading performance of the RFID system for RFID technology application.Firstly,the optical image visualization technology is presented based on the development of RFID tag's antenna design,which could be used to optimize the environmental factors of interference in RFID system.Through the analysis of visual images with the interference to optimize the two kinds of design of the RFID system,we complete the electromagnetic radiation SAR(specific absorption rate)image processing and image feature value selection.Based on the method of optical image visualization simulation,this paper presents a design method of anti interference of the liquid medium which can bend deformation of the RFID system.Finally,the optical image simulation technology is used for image analysis of radiation on antenna electromagnetic field space distribution,and that of the impact of the performance of the RFID system,which verify the feasibility of the design.Secondly,according to the characteristics of SAR electromagnetic images,electromagnetic field spatial wavelet denoising method and particle swarm algorithm of automatic mode radiation SAR image speckle noise reduction based on brightness are presented.Subsequently,based on the photoelectric scan and RFID simulation of electromagnetic field SAR images processing,this paper designs a method of image matching of space electromagnetic field distribution of RFID system through the optical scanning simulation and image processing to generate SAR images and image expression data.Using a new feature selection method,SAR image feature values are selected from the image database,integration,statistics.Moreover,the grayscale characteristic values of high-frequency characteristic value expression and the image information of SAR map are easily extracted,which can improve theimage matching efficiency,reduce the error,and improve the effect of image feature point selection stability.Finally,according to the basic principle of electromagnetic information and RFID system,to match the image search,analysis of the high frequency feature points and the relationship between the external environment interference and the performance of the RFID system,the method of matching feature points of SAR image is studied by extracting area matching feature points.Furthermore,according to the search for picture to make adjustment of the antenna parameters,the target of improvement of RFID system is achieved.Overall,the use of space electromagnetic optical image scanning system and the simulation of RFID electromagnetic radiation field,the relationship between the image and the performance parameters of RFID and the disturbance of the external environment have been studied.Some key points are selected by image processing and image matching method to realize RFID system optimization and reverse design.The visualization of the optical images and the theory of electromagnetic radiation have an important reference value to improve the efficiency of electromagnetic signals and to reduce the influence of environment on the performance of RFID system. |
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