图像自适应分段线性拉伸算法的FPGA设计

Implementation of Adaptive-Piecewise Linear Stretching Algorithm Based on FPGA

为改善红外图像的视觉效果和后续处理质量,需要对图像进行增强处理。在此介绍并实现了一种空间域图像增强算法,自适应分段线性拉伸算法。首先简要分析算法原理,对该算法基于Xilinx公司XC4VLX15系列FPGA的实现方法进行了研究,以兼顾系统实时性和集成度为目的,提出灰度直方图统计和拉伸运算等关键模块的解决方案。通过试验结果分析,对压缩因子的选取提出建议。该设计的输出延迟仅为62.5 ns,且具有实现简单、集成度高、功耗低等优点,适合在精确制导武器和导航系统中应用。

Infrared images need to be enhanced to improve its performance in the visual effect and subsequent processing quality.One kind of image enhancement algorithm adaptive-piecewise linear stretching algorithm in spatial domain is introduced.The techniques to implement it were researched based on Xilinx XC4VLX15 FPGA chip.The solutions to implement important modules such as the histogram statistics and adjusting operation are proposed in consideration of the capability of real-time processing and system integration level.Suggestions of the saturated factor are made with the analysis of the experimental results.The designed output delay is only 62.5 ns,and other advantages such as simple structure,high integration level and low power consumption allow it to applied in the precision-guided weapon and navigation system.