基于FPGA的采集卡的图像增强算法应用研究

Study on image enhancement algorithm of FPGA-based acquisition card

首先对图像采集卡系统的组成、整体方案和可行性进行了论证,然后给出了图像采集卡的硬件设计。用VHDL和原理图结合的方法对FPGA进行编程,实现了图像采集系统的各个功能模块。接下来提出一种采用设计的FPGA卡实现带修改参数的灰度变换图像增强算法,给出算法的详细表达式及其实现的定点化子程序,并且给出了图像算法在FPGA中采用VHDL语言的具体实现。最后,对算法的有效性进行了测试,比较了采用该算法及不采用该算法2种情况下的图像增强效果。

Firstly,the composition,overall program and feasibility of the image acquisition card are demonstrated in this paper,and then the hardware design of the image acquisition card is offered. The FPGA is programmed by the method that com-bines VHDL with schematic diagram. Various functional modules of the image acquisition system are realized. A gray-level trans-formation image enhancement algorithm with modified parameter and the programmed FPGA card is proposed in this paper. ex-presses The detailed expressions of the algorithm and its fix-point subprogram are given in this paper. The concrete implementa-tion of the image algorithm when using VHDL language in the FPGA is described. The validity of the algorithm was tested. The image enhancement effects of both cases,in which the algorithm is used and not used,are compared.