Key Technology Of Multi-channel Image Acquisition And Transmission Based On FPGA

With the rapid development of the large scale integrated circuit,computer technology and the technology of communication,image acquisition and transmission system are applied into a variety of areas in modern society.And this also promotes the rapid development of the digital image acquisition technology.However,how to design an image acquisition and transmission system with a wide field of view,high-resolution,real-time and portability remains one of the research hotspots in the area of modern image acquisition and transmission.For this purpose,this article designs a multi-channel image acquisition and transmission system based on FPGA.This system acquires high-resolution wide field image with 3x3 image sensor array.Image resolution for each channel is 2592x1944,the frame frequency is 5fps,the pixel width is 16 bit and the bandwidth of each channel data is about 403 Mbps.At the time of design,9 image sensors are installed in 3 boards and the total data bandwidth of each board is about 1.2Gbps.Each board uses Xilinx Spartan 6 FPGA as the main control chip,uses the image sensor array consisted of OV5640 image sensors to acquire high-resolution wide field image,uses DDR2 SDRAM to store the image data,uses optical fiber transmission to implement the transmission of high bandwidth data,and uses HDMI to display the high-resolution image.For the image acquisition and display module,it mainly talks about how to implement the configuration of the internal registers of OV5640 image sensor and Sil9136 HDMI coding chip through SCCB protocol and IIC protocol respectively..For the cache module of images,this part mainly designs and implements how to control DDR2 SDRAM storing data through the MCB IP core and how to design the asynchronous FIFO to solve the cross clock-domain problem during data storage.For the transmission module of images,this part mainly implements how to control optical module transmitting high bandwidth data through the Aurora 8B/10 B IP core.Finally,through the debugging and verification,the results show that the design of multi-channel image acquisition and transmission system based on FPGA achieves the requirements of the subject.We summarize the characteristics of the article and point out the further optimization direction of the system.