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1. 中国科学院长春光学精密机械与物理研究所 中国科学院航空光学成像与测量重点实验室,吉林 长春,130033
2. 中国科学院大学, 北京 100049
收稿日期:2013-10-29,
修回日期:2014-01-02,
纸质出版日期:2014-10-05
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赵凡, 张葆. 基于FPGA的航拍图像实时增强[J]. 液晶与显示, 2014,29(5): 793-799
ZHAO Fan, ZHANG Bao. Aerial image enhancement processing based on FPGA[J]. , 2014,29(5): 793-799
赵凡, 张葆. 基于FPGA的航拍图像实时增强[J]. 液晶与显示, 2014,29(5): 793-799 DOI: 10.3788/YJYXS20142905.0793.
ZHAO Fan, ZHANG Bao. Aerial image enhancement processing based on FPGA[J]. , 2014,29(5): 793-799 DOI: 10.3788/YJYXS20142905.0793.
为了更好地增强图像的细节信息、提高图像的对比度,提出了基于子层分割对比度拉伸算法。根据直方图特征将其平均分为4个子层区域,在每个子层中根据其灰度值概率密度之和的大小对灰度区域进行拓展或压缩。为了防止灰度区域被过分压缩或拉伸,引入了约束因子
。以现场可编程门阵列为中央处理器,采用组合逻辑对本文算法进行建模。在得到直方图统计结果的基础上,算法可在一个时钟周期完成,相比于流水线操作时间减少了510
3
ns,可满足50 frame/s的实时图像处理要求。该系统具有集成度高、图像处理速度快和实时性强等特点。
In order to enhance the image details and improve image contrast
this paper presents a contrast stretch sub-layer segmentation algorithm. First
the histogram is divided into four sub-layer equally according to feature of the histogram. In each sub-layer
the sub-layer are expanded or compressed on the basis of the probability density of gray value. In order to prevent the gray area being overly compressed or stretched
the constraint factor
is introduced. By applying field programmable gate array (FPGA) as the central processor
the algorithm is modeled on combination of logic mode-ling. Based on the histogram statistics results
the algorithm can be completed in a single clock cycle
and the time was reduced by 510
3
ns compared to the pipeline operation.This system can meet the requirements of real-time processing for 50 frames/s image processing and has high integration
and high image processing speed and real-time features.
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