摘要雾天图像拍摄效果总体上对比度低，整个图片看起来白茫茫，图像去雾的目的就是提高有雾图像的对比度，还原理想图片。由于在各种领域譬如导航，识别以及跟踪等所需要的图像都需要与真实条件相同。所以很有必要进行图像清晰化。本文详细分析了雾天CCD图像的特点，通过查阅相关文献学习了图像去雾的基本技术，文中列举了四种常用的典型图像去雾算法，包括直方图均衡化、基于Retinex的图像去雾算法、基于模板锐化的同态滤波算法以及基于局部方差的对比度拉伸法，详细阐述了各算法的原理和算法步骤，并用Matlab编程进行仿真，通过主观观察比较了不通算法处理后的同一张图片的对比度、细节以及场景轮廓，发现Retinex的图像去雾算法各方面处理效果良好，能达到对比度增强以及凸显细节轮廓的视觉效果，用不同的典型雾天图像实验了这些算法。65170

毕业论文关键词 去雾  matlab增强算法  雾天图像  直方图  对比度 

毕业设计说明书（论文）外文摘要

Title         CCD fog-penetration image enhancement            

    technology research based on Matlab software           

Abstract    The image shooting by CCD imaging system of the foggy weather conditions is mbiguous, The overall contrast is reduced, the visual effect of partial gray, through the fog image enhancement technology is to restore the foggy image contrast and color, clear picture taken in ideal weather conditions. The overall contrast is reduced, the visual effect of partial gray, through the fog image enhancement technology is to restore the foggy image contrast and color, clear picture taken in ideal weather conditions. In view of the fact that many algorithms about image, target recognition, target tracking, intelligent navigation, image processing and computer vision image is the assumption that the input image or video is filmed in ideal weather conditions, so the fog image clearness is particularly important. This paper introduces four commonly used kinds of typical image defogging algorithm： including histogram equalization、 image defogging algorithm based on Retinex、the same state filtering algorithm based on template sharpening and drawing method of local based on the comparison of variance, describes the principle and algorithm steps of each algorithm in detail. Programming with Matlab to simulation, with a picture of different algorithms of contrast, details and scene contour were compared by subjective observation,I found that the Retinex image defogging algorithm in all aspects of the treatment effect is the best, can achieve the contrast enhancement and highlight the details of the outline of the visual effects, with different typical fog image experiment. The algorithm, verifies the good effect to the fog image.

Keywords   defogging  dnhancement  algorithm  histogram contrast

目 录

1 绪论 1

1.1 课题研究背景及意义 1

1.2 国内外研究现状 1

1.3 本文的主要工作 2

2 雾天CCD成像原理 4

2.1 CCD成像系统的原理 4

2.2 雾天图像退化模型 4

3 基于matlab软件的CCD透雾图像增强 6

3.1 matlab图像处理功能 6

3.2 图像去雾算法 6

3.2.1 直方图均衡化