Research On The Technology Of Digital Image Enhancement Based On FPGA

In improving the quality of video image, extracting important features, and eliminating noise of image, the technology of digital video image enhancement plays an important role. But with the characteristic of good real-time, high transmission speed, large amount of data, digital video image put forward higher requirements for digital video image processing system. With high-speed parallelism, designed to be simple and flexible, rich logical unit, low cost and high reliability in the video image processing technology, FPGA (Field Programmable Gate Array) has become a research focus.Based on the technology of digital video image enhancement and FPGA image processing in the application of the research, this paper puts forward the design of FPGA-based digital video image enhancement system. It is divided into two parts:the realization of digital video image enhancement and image system enhancement Algorithm in FPGA. Where in the design of digital video image enhancement system include camera acquisition, SDRAM cache, VGA display, image enhancement algorithms in the FPGA implementations include window generating module, ranks counting module, image enhancement algorithm module. Design of camera acquisition module includes the camera initialization and image acquisition, the design of SDRAM cache module includes the design of SDRAM controller, the ping-pong operation of different BANK of monolithic SDRAM, the FIFO module processing asynchronous clock domain, the design of VGA display module includes the driver of ADV7123of digital-analog converter chip and the design of VGA interface timing.The design of window generation module including the use of FIFO for delay, and delay to obtain the window data using register. The design of counter module reuses the ranks of row and column coordinates in VGA timing modules. The design of Image enhancement algorithm module includes the realization of fast median filtering algorithm and weighted mean filter algorithm in FPGA. Finally, the function simulation of each module by using Modelsim simulation software, to verify the correctness of the module design, the experimental results of the simulation diagram and the display shows the correctness, feasibility and reliability of the design.