Design Of Multi-aperture Image Information Processing System

In the areas such like public security,wide-area monitoring,space remote sensing,panoramic imaging,it is required to obtain images with large fields of view and high resolution.Therefore,multi-aperture image acquisition and processing systems have received extensive attention and development in recent years.Currently,the multi-aperture system has the disadvantages of high cost in hardware design,development difficulty,and low scalability.On the other hand,the existing multi-aperture systems often require extra computers for further image processing.Focusing on these problems,a multi-aperture image information processing system connected up to 36 cameras is designed in this thesis.The system can be applied to a wide range of fields with the characters of low cost,compact structure,and high scalability.The main work of this paper is as follows:(1)Review of the existing researches,including system implementation functions,performance indicators,and hardware design structures.The modular design scheme with independent functions adopted in this paper is proposed by summarizing the realization function of this type of system,and also by comparing and analyzing the advantages and disadvantages of the corresponding design architecture.Dividing the four main functions(image acquisition,management,distribution,and information processing)into different circuit modules,this design can maximize the utilization of hardware resources,reduce the cost of system development,maintenance and upgrade effectively,and improve the system’s scalability.(2)According to the overall scheme,the image acquisition module,image management module,image distribution module and image processing module are designed based on FPGA,FPGA+MCU,DVI splitter,and FPGA+ARM,respectively.In order to reduce the cost of hardware design and the difficulty of development of data transmission,DVP interfaces and DVI transmitters and receivers are used to transmit the streams of image data between modules.In addition,IIC,SPI,and UART communication interfaces are used to construct the transmission network of control information in this system.At the same time,to cooperate with the hardware system,a set of software was designed to adjust the camera parameters,configure the system operating mode and display the processing results.(3)According to the functional requirements of each module,the transmission logic of image data flow between different modules is designed by summarizing the system implementation function.A large number of ping-pong operations and bus arbitration modules are used in the implementation to ensure accurate and efficient data flow.According to the characteristics of the control information packets received by different modules,data transmission protocols of the SPI interface and multiple IIC interface are designed.(4)Different modules are tested separately cooperated with the software and optical system connected to the system.The test results are presented in the form of display images.A large number of test results show that the designed system in this thesis can meet the requirements of our industrial program.This system realizes the function of collecting and displaying 29 channels image with the resolution of 752×480@25fps and has the capability of real-time detection of moving objects.Benefited from its innovative design structure,the system developed in this thesis is able to collect 36 channels of images with a total speed of nearly 1GB/s.It also has good capabilities of image information processing,high versatility and scalability.The system can be used in the fields of seeker,wide area monitoring,large field of view imaging,public security,etc.It has high value of application and design reference.