计算机与现代化

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基于小波变换的含噪图像边缘检测算法

  

  1. 深圳大学数学与计算科学学院,广东深圳518060
  • 收稿日期:2014-07-17 出版日期:2015-02-28 发布日期:2015-03-06
  • 作者简介:郝红转(1989),女,河南驻马店人,深圳大学数学与计算科学学院硕士研究生,研究方向:小波分析及其在图像处理中的应用; 张维强,男,副教授,博士,研究方向:小波分析, HilbertHuang变换及其在图像、信号处理中的应用。
  • 基金资助:
    国家自然科学基金资助项目(11101292); 教育部博士学科点专项科研基金资助项目(20134408110001); 深圳基础研究项目(20120613114019685)

Noise Image Edge Detection Algorithm Based on Wavelet Transform

  1. College of Mathematics and Computational Science, Shenzhen University, Shenzhen 518060, China
  • Received:2014-07-17 Online:2015-02-28 Published:2015-03-06

摘要:

针对含噪图像边缘检测时出现的噪声去除不完全和边缘定位不精确的问题,本文提出一种改进的图像边缘检测算法,该算法首先根据范数性质改进对图像进行小波变换求模极大值边缘检测时的梯度
模算法,然后对得到的边缘图像利用本文所提出的阈值算法处理,最后连接图像,得到最终的图像边缘。计算机仿真结果表明,对于含噪图像,改进的算法能得到较为理想的图像边缘信息,实现了去噪和目标
边缘精确定位的双向平衡,与传统的检测算法相比,检测效果有一定的提高。

关键词: 小波变换, 图像处理, 边缘检测, 含噪图像, 梯度, 阈值方法

Abstract:

Focusing on the problem of noise removal is not complete and edge position is not accurate, this paper presents an improved algorithm for detecting noisy image edge.
The algorithm first improved the gradient algorithm at the time of detecting the edge used by the wavelet transform modulus maxima according to the norm’s nature. Then we used
the improved threshold method which was proposed in this paper to the edge image, and after connecting the image, it obtained the final image edge. Through computer simulation
to validate the algorithm, experimental results show that the algorithm can get the ideal edge image information in noise image, and achieve the bidirectional balance of de
noising and edge precise positioning. The detection algorithm is superior to the traditional method, and it also improves in the aspect of detection effect as well.

Key words: wavelet transform, image processing, edge detection, noise image, gradient, threshold method

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