基于MATLAB的高效率图像边缘检测技术研究

基于MATLAB的高效率图像边缘检测技术研究(论文12000字,外文翻译)
摘要：本文首先介绍边缘检测技术的发展和研究意义。其次，在第二章回顾了传统的图像边缘检测算法，并进行实验对比，为后面介绍Canny算法抛砖引玉。在第三章，介绍常规Canny算子，并进行实验对比，认识到传统的Canny算法中的不足，本文随后提出了一种提高去噪性能的改进型Canny边缘检测算法。一，运用自适应中值滤波处理原始图像;二，在传统Sobel算子基础上增加45°和135°方向模板计算梯度幅值;最后，运用最大类间方差法计算已被处理的图像的阈值。通过实验结果对比表明，本文提倡的改进版Canny算法拥有较好的抗噪性能，较传统Canny算法有明显改进，能精确地检测出边缘，明显提高了图像边缘检测的效率。
关键字：边缘检测；Canny算子；自适应中值滤波；最大类间方差法
 
Research on Image Edge Detection Technology With High Efficiency based on MATLAB
Abstract:In this paper, we first introduce the development and application of digital image processing.Then in the second chapter, we review some traditional image edge detection algorithms,doing bedding for Canny algorithm. In the third chapter, to decrease the shortcomings of the traditional Canny algorithm, with the basic principles of Canny algorithm, the three criteria of the algorithm, the idea of the algorithm and the detection steps,the paper proposes an improved Canny edge detection algorithm which mainly promotes the denoising performance. Firstly, the adaptive median filter is used to process the original image. Second, the 45 ° and 135 ° templates of the Sobel operator are added to calculate the gradient amplitude of the pixel. Finally, the Otsu algorithm is used to calculate the thresholds of the processed image. The results of all the experiments show that the improved Canny algorithm has better anti - noise performance than the traditional Canny algorithm, and it can accurately detect the edge information, which obviously improves the efficiency of image edge detection.
Key words: edge detection; Canny operator; adaptive median filtering; Otsu algorithm
 
目 录
1.引言    1
  1.1数字图像处理的发展及应用    1
  1.2图像边缘检测概论以及研究意义    2
    1.2.1图像边缘检测概论    2
    1.2.2图像边缘检测的研究意义    2
  1.3本文的主要内容    3
2.传统边缘检测算法的介绍和分析    3
  2.1 图像边缘检测对边缘的定义    3
  2.2 基于一阶微分的边缘检测算子    4
    2.2.1 Roberts算子    5
    2.2.2 Sobel算子    5
    2.2.3 Prewitt算子    6
    2.2.4 仿真结果对比与分析    6
  2.3 基于二阶微分的边缘检测算子    8
    2.3.1 Laplace算子    8
    2.3.2 LOG算子    9
    2.3.3 小结    10
  2.4 本章小结    11
3.Canny边缘检测算法的介绍    11
  3.1 Canny准则    11
  3.2 传统Canny算法的边缘检测步骤    12
  3.3 传统Canny算法的实验仿真与对比    15
4.Canny算法的改进与研究    17
  4.1 关于改进Canny算法的介绍    17
    4.1.1 自适应中值滤波器    17
    4.1.2 在Sobel算子的基础上添加45°和135°方向模板计算幅值    18
    4.1.3 最大类间方差阈值分割    21
  4.2 传统Canny算法和改进Canny算法的仿真实验结果    23
5.总结和展望    25
参考文献：    26
致谢    27