Fpga-based Scene Image Fusion Research And Design Of The Visualization System

Along with the development of picture processing technology and projection technology, people request to high immersed feeling of virtual reality scene. This kind of virtual reality scene with high sharp image often needs to be projected on the screen by multichannel projection instrument, then compose these independent pictures to be a large scene picture. In order to present a lifelike effect, the projection screens are designed as cylinder screens, or even spherical surface screens, this may bring the result of geometrical change when picture was projected in the cylinder screen. The key to affect imagery effect is the geometrical correction and edge blending technology used in projection splicing process of the picture.A large scene visible system is composed by the projecting camera, the projection screen, the picture process machine and so on. In the virtual reality application system, in order to realize vivid multi-screens seamless splicing as well as the curved combination demonstration, the display system also needs to utilize picture processing technology, such as geometrical distortion and edge fusion to demonstrate the picture on the plane, cylinder, spherical surface and other projection screens. The essential technology lies in the picture fusion machine which will complete real-time data gathering from the graph server or the PC, and process the image data with geometrical correction and edge blending, then transfer the data to display device.The thesis presents one kind of picture process system bases on the FPGA technology including following functions: image data's A/D gathering, deposit and withdrawal in SRAM or SDRAM, DSP in the FPGA and D/A output. The core part of system design lies in the system control and digital signal processing. This project uses Xilinx Virtex4 series FPGA as primarily processor. The A/D module, D/A module, SRAM controller, SDRAM controller and the ARM processor controller logic are designed using Verilog HDL language.This project designed an ARM processor in the FPGA picture processing system, used to tranfer parameter for image process when system power on, and updata new parameter from PC immediately. Such design enhanced system performance at the same time to be also advantageous for the expansion.This thesis firstly introduces the geometrical distortion algorithm and the edge fusion algorithm which used in the image processing, secondly proposed the system design proposal and the module division, thirdly introduced the design method of SDRAM controller, finally introduced the ARM processor connection and the periphery electric circuit design.