Research And Implementation Of Embedded Video Capture Subsystem In High Definition Network Camera

The digital signal processing technology,display technology,network technology,multimedia technology and integrated circuit technology,and constantly improve people's awareness of security,the high-definition network camera daily more and more widely used.The embedded video acquisition system as the core module of high-definition network camera,mainly to complete the video image data acquisition,preprocessing,encoding,transmission and other functions,better quality,higher resolution is always in constant pursuit of high-definition network camera products target.(1)This thesis analyzes the development and research status of embedded video acquisition system,and the key technologies of high definition video camera video capture subsystem are analyzed.It introduces the hardware and software architecture of the multi-core processor TMS320DM8127,and its main advantages as the core processor of HD network camera.(2)A high-definition network camera hardware system was designed based on multi-core processor TMS320DM8127 platform,from the selection of the system components to the circuit design and implementation of the hardware sub modules are described in detail.(3)Analyzing the process of the TMS320DM8127 's ISP(Image Signal Processing),and the existing mainstream automatic white balance algorithm.Comparing the advantages and disadvantages of each algorithm,aiming at the lack of adaptability of existing mainstream algorithms and taking up more system resources,this thesis puts forward the improved method of combination of the color temperature,white spots,mono color removal.(4)Through the comprehensive test of the system,to verify the feasibility of the improvement measures in the image acquisition automatic white balance is proposed and the correctness and stability of embedded video acquisition system hardware platform design,the experiment results show that enhanced adaptive algorithm to improve the image quality of the image scene of these improvements in the design the hardware platform is stable,reliable and effective.This thesis involved mainly come from a research and development project of author's enterprise.The design and implementation of hardware architecture mentioned and the interface and the corresponding software design has been completed,and realizes the collection,transmission,storage,management and other relevant functions.At the same time through product certification and industry related certification,is the gradual realization of the small batch production trial sales.