Optimization Of Wireless Mapping System And Implementation Of Adaptive Multi-partition Screen

With the development of audio and video technology,and the maturity of coding technology,multimedia applications have been widely used.Multimedia interaction can not only express intentions directly,but also improve the efficiency of communication.As one of the main way to realize multimedia interaction,projection has been widely used in education,entertainment,medical,conference and other scenarios.However,the traditional projection is limited by the lack of wiring and function.Although the exsiting projection based on wireless technology solved these problems to a certain extent,it is still limited because problems such as multi-user access,data sharing and unsupported environment are not considered.To solve the problems above,an adaptive multi-screen wireless projection system for multi-user access is designed and implemented in this thesis by analyzing the current situation of existing projection methods,and the system is optimized by using weight rendering method and SIMD instruction set.Firstly,the transmission and coding technology in video transmission system are studied in this thesis.Besides,format of RTP/RTCP protocol and the parameters used in H.264 coding are analyzed in detail.The thesis lays the foundation for the later test through the research of video quality evaluation method.Secondly,this thesis proposes an adaptive multi screen algorithm under Linux system,and on the basis of the algorithm,a data rendering method based on weight is proposed,combined with the strategy that existing wireless multimedia transmission system being used to guarantee the video quality.Then,the wireless projection system is implemented,and the SIMD instruction set is used in the key steps of multimedia processing.This thesis also optimizes the wireless projection system for multi user access through weight rendering method.Finally,the network bandwidth,delay and average packet loss rate are tested,the results show that the system can meet the real-time requirements.And then the weight rendering method is tested,the results show that after using the SIMD instruction set optimization,the wireless projection system can not only support multiple users access at the same time,but also provide a better video quality after using weight rendering method.