Aerial image enhancement processing based on FPGA

ZHAO Fan; ZHANG Bao

doi:10.3788/YJYXS20142905.0793

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Aerial image enhancement processing based on FPGA

Table of contents | 更新时间：2020-08-12

- Aerial image enhancement processing based on FPGA
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 5, Pages: 793-799(2014)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142905.0793
  CLC： TP391
- Received：29 October 2013，
  
  Revised：02 January 2014，
  
  Published：05 October 2014
- 稿件说明：
移动端阅览
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.

摘要

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

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。

Abstract

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

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.

关键词

Keywords

references

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