Based On Fpga Is Small The Design And Implementation Of A Real-time Image Enhancement Processor

The national medium and long-term planning has added high-resolution visible earth observation to one of the sixteen Special emphases. Acquiring real-time HD remote sensing image by planes or satellites has been playing a very important role in both military and civilian. However, due to the affections caused by atmosphere condition、unstability of flying carrier and some other factors, the quality of the remote image normally would deteriorate, which is to the disadvantage of the follow-up interpretation and target feature recognition. How to realize the real-time image enhancement and restoration under the condition of using small size and low power dissipation as much as possible has become more and more urgent nowadays. The continuing expands of integrated circuit scale and constant development of computer technology lay the foundation for the realization of the miniaturization of the real-time image enhancement techniques.This paper is focus on the linear scanning image enhancement technique and its realizations, under the support of the cooperative project by Nanjing University of Science and Technology and Changchun Institute of Optics, Fine Mechanics and Physics of the Chinese Academy of Sciences. One miniaturization real-time image enhancement module based on FPGA is developed. The module has the advantages of smaller size, lower power dissipation, lighter weight, lower cost and wonderful stability, etc. The main work of the paper can be listed as followed:1、Three kinds of image enhancement algorithms are researched. According to the simulation results, the adaptive histogram equalization algorithm with enhancing the details is chosen to apply onto the hardware platform.2、According to project interface and function demanding, the image enhancement system implementation scheme and the design of software and hardware are accomplished based on FPGA, including the design of schematic diagram and PCB, hardware circuit debugging, FPGA program design and MFC program interface on PC, etc.3、The verification of capacity is accomplished, including establishment of the test verification environment and measured verification on the enhancement module for its heightened impact. The results proved that the introducing enhancement module can complete the real-time gray-scale image enhancement of4096lines of resolution with28KHz horizontal frequency, and the enhancement effect is obvious, which is helpful for the follow-up image analysis feature extraction.