This paper introduces an error concealment algorithm for P frame in video images that based on the error concealment algorithm in the reference software of H.264, which makes it extremely easy and flexible to obtain the best performance of error concealment at the decoder, and describes the theoretical foundation and realization in detail. External boundary matching algorithm (EBMA) based on calculate the difference of external nearby pixel between reference block and lost block which could better adapts to the characteristics of alterable blocks in motion estimation and improve the effect of error concealment of lost MB. The result of the proposed algorithm implemented on JM version 8.6 shows that have some advantages and practicality.
Researches have been conducted into the technology of data transmission and position detection based on induction radio to realize positioning control in mobile locomotive location, and the locomotives positioning control systems by induction radio have been designed. The principles and methods of induction radio technology are mainly analyzed. The reliable information transmission systems between locomotives and center control room are built, and the mobile locomotive location can be acquired by detecting the phase and amplitude of induced emf. The basic principles of data transmission by induction radio are discussed in this paper. The technology of co-channel interference in data transmission is described, and the hardware circuit of data transmission by induction radio is also provided. The system principle mentioned in this paper is easy, and the design methods are reasonable, which can meet the requirements of positioning control in mobile locomotive location.
APT (Acquisition, Pointing, and Tracking) system of space laser communication adopts compound axis structure; it consists of coarse tracking and fine tracking system. Its response speed and tracking precision mainly rests with the fine tracking system. Traditional PID control algorithm often is used in APT fine tracking system. In order to improve the dynamic performance of the system and decrease the tracking error, optimum control technology was adopted in this paper. On the basis of considering the system dynamic performance requirements and tracking precision requirement, optimum controller was designed. The simulation result shows that the bandwidth of APT fine tracking system is up to 1310 Hz, and the stable state error is less than 0.002. Compared with PID control, optimum control can improve the tracking performance of system.
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