Edge detection based on logarithmic domain gradient and improved Sobel operator

Ke-qiang REN; Rong ZHANG

doi:10.3788/YJYXS20193403.0283

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Edge detection based on logarithmic domain gradient and improved Sobel operator

Image Processing | 更新时间：2020-07-05

- Edge detection based on logarithmic domain gradient and improved Sobel operator
- Chinese Journal of Liquid Crystals and Displays Vol. 34, Issue 3, Pages: 283-290(2019)
- 作者机构：
  
  江西理工大学信息工程学院, 江西赣州 341000
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20193403.0283
  CLC： TP391
- Received：29 October 2018，
  
  Accepted：21 December 2018，
  
  Published：2019-03
- 稿件说明：
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Ke-qiang REN, Rong ZHANG. Edge detection based on logarithmic domain gradient and improved Sobel operator[J]. Chinese journal of liquid crystals and displays, 2019, 34(3): 283-290.
DOI：

Ke-qiang REN, Rong ZHANG. Edge detection based on logarithmic domain gradient and improved Sobel operator[J]. Chinese journal of liquid crystals and displays, 2019, 34(3): 283-290. DOI： 10.3788/YJYXS20193403.0283.

摘要

为了消除不均匀光照给图像边缘检测带来的影响，提出一种对数域梯度与改进Sobel算子相结合的边缘检测方法。该方法首先将图像变换到对数域，通过削弱低频入射分量增强高频反射分量，以提升图像亮度；然后合成改进的4方向Sobel算子，并用无穷范数表示梯度，以使需要被检测的图像更加完整；最后通过Bernsen算法得到的阈值与高斯滤波后得到的Bernsen算法阈值进行线性组合来确定最佳阈值，以使图像边缘更加连续完整。仿真实验结果表明，该方法可以有效消除不均匀光照对图像边缘检测的影响，与相关算法和文献相比，该方法对不同照度图像的边缘检测效果更好。

Abstract

In order to eliminate the influence of uneven illumination on image edge detection

an edge detection method based on logarithmic domain gradient and improved Sobel operator was proposed. Firstly

the image was transformed into logarithmic domain to enhance the brightness of the image by weakening the low-frequency incident component and enhancing the high-frequency reflection component. Then

the improved 4-direction Sobel operator was synthesized and the gradient is expressed by infinite norm

so as to make the edges of the image to be detected more complete. Finally

the threshold obtained by the Bernsen algorithm was linearly combined with the threshold of the Bernsen algorithm obtained by Gaussian filtering to determine the optimal threshold

which could make the edges of the image more continuous and complete. The simulation experiment results show that the method can effectively eliminate the influence of uneven illumination on image edge detection

and compared with related algorithms and literatures

the method has better edge detection effect on different illumination images.

关键词

Keywords

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