频域图像增强技术毕业论文.doc

摘要
图像增强是指按一定的需要突出一幅图像中的某些信息,同时削弱或去除某些不需要的信息,使之改善图像质量,加强图像判读和识别效果的处理技术。空域图像增强是图像处理的一个重要分支,它能有效改善图像整体或局部特征。图像增强处理技术一直是图像处理领域一类非常重要的基本图像处理技术。本文从空域和频域展开图像增强技术,重点阐明数字图像增强处理的基本方法,介绍几种频域图像增强方法,并用频域法进行图像增强,通过形态学方法进行图像特征抽取和分析。运用MATLAB,修改图像的傅里叶变换来实现图像的增强技术。图像增强是数字图像的预处理,对图像整体或局部特征能有效地改善。为了实现对数字图像的增强处理,采用频域高频加强滤波的方法对图像进行了增强处理。利用图像中变化剧烈的信息只与高频成分有关这一原理,结合MATLAB 设计实现了高频加强滤波器并对图像进行了增强处理,我研究的内容就是能够运用MATLAB工具对偏暗和偏亮图像进行处理,以便达到符合特定场景的目的。
关键词:图像增强 MATLAB 频域增强低通滤波高通滤波
Abstract
Images enhance is a need to highlight a picture in the information and to attenuate or remove certain information, the image quality improvement, strengthening the interpretation and identification of processing. Airspace images enhance the image of an important branch, it is effective in improving the image of overall or local characteristics. images enhance processing image processing area has been a very important basic imaging technology. from the airspace and frequency domain an increased focus on the image technology to handle digital image of the basic method of frequency domain, images, and increase the frequency domain, through images enhance out the form of learning methodologies image feature extraction and analysis. Using matlab and the amendment of the picture varies Fourier to realize the image. images enhance the skills to enhance the image of a digital image preprocessing to the overall or local characteristics. in order to effectively improve the implementation of digital image processing and enhance the frequency domain high frequency filtering to strengthen the image of the enhanced. Using images to change the information only and high ponents on the principle of matlab and design to implement the high frequency enhance filter and a stronger image processing, i studied the content is a tool for using matlab dark and light images are processed in order to pliance with specific purpose.
key words: Images enhance MATLAB Increase the frequency domain
Low through filtering Takamichi filtering